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Introduction of the New SLK AMG Model Series 172 AMG
Introduction into Service Manual
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Mercedes-Benz Service
Introduction of the New SLK AMG Model Series 172 AMG
Daimler AG · Technical Information and Workshop Equipment (GSP/OI) · D-70546 Stuttgart
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Information and Copyright
Product Portfolio You can also find comprehensive information on our complete product portfolio in our Internet portal. Link: http://aftersales.mercedes-benz.com Questions and suggestions If you have any questions or suggestions concerning this product, please write to us. E-mail: customer.support@daimler.com Fax: +49-(0)18 05/0 10-79 78 or alternatively Address: Daimler AG GSP/OIS HPC R822, W002 D-70546 Stuttgart
© 2011 by Daimler AG This document, including all its parts, is protected by copyright. Any further processing or use requires the previous written consent of Daimler AG, Department GSP/OIS, HPC R822, W002, D-70546 Stuttgart. This applies in particular to reproduction, distribution, alteration, translation, microfilming and storage and/or processing in electronic systems, including databases and online services. Image no. of title image: Image no. Poster: Order no. of this publication: 10/2011 P00.01-4212-00 P00.01-4213-00 6516 1386 02 - HLI 000 000 03 07
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Contents
Preface
5
Overview Models and major assemblies Brief description Equipment
7 8 10
Overall vehicle Exterior Technical data Interior
15 18 20
Maintenance Maintenance intervals
23
Powerplant Highlights Engine data comparison M152 - M113 EVO Crankcase Crank assembly Cylinder head Cylinder shutoff Injection system Controlled Efficiency Oil and water circuits Exhaust system
24 26 28 30 31 32 35 36 37 39
Introduction of the New SLK AMG, Model Series 172 b
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Contents
Transmission Transmission data
42
Chassis Steering Axles Suspension Brake system Wheels and tires
44 45 46 47 48
Lights Exterior and interior lights
49
Safety Safety systems
50
Driving assistance systems Systems at a glance
51
Special tools Engine
52
Annex Abbreviations Index
53 55
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Preface
Dear Reader, This Introduction into Service Manual presents the new SLK-Class AMG roadster of model series 172. The purpose of this brochure is to acquaint you with the technical highlights of this new vehicle in advance of its market launch. This brochure is intended to provide information for people employed in service or maintenance/repair as well as for aftersales staff. It is assumed here that the reader is already familiar with the Mercedes-Benz model series currently on the market. In terms of the contents, the emphasis in this Introduction into Service Manual is on presenting new and modified components and systems. This Introduction into Service Manual is not intended as an aid for repairs or for the diagnosis of technical problems. For such needs, more extensive information is available in the Workshop Information System (WIS) and Xentry Diagnostics. WIS is updated continuously. Therefore, the information available there reflects the latest technical status of our vehicles. This Introduction into Service Manual presents initial information about the new AMG roadster of model series 172. As such, the Introduction into Service Manual is not stored in WIS. The contents of this brochure are not updated. No provision is made for supplements. We will publicize modifications and new features in the relevant WIS documents. The information presented in this Introduction into Service Manual may therefore differ from the more up-to-date information found in WIS. All information relating to specifications, equipment and options is valid as of the copy deadline in October 2011 and may therefore differ from the series production configuration.
Daimler AG Technical Information and Workshop Equipment (GSP/OI)
i Note Information about the vehicles and about operating the vehicle functions can also be found in the interactive owner's manual on the Internet at:
www.mercedes-benz.de/betriebsanleitung
Introduction of the New SLK AMG, Model Series 172 b
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b Introduction of the New SLK AMG, Model Series 172
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Model series SLK 55 AMG
Model 172.475
Engine 152.980
7-speed automatic transmission 722.909
Market launch 01/12
Mercedes-Benz SLK 55 AMG (model series 172)
P00.00-4766-00
Introduction of the New SLK AMG, Model Series 172 b
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Overview
7
Models and major assemblies
Overview
Brief description
Vehicle concept
Forming part of the third generation of the SLK, the new top-of-the-range AMG model is the perfect embodiment of the new AMG brand claim of "Driving Performance": in the compact high-performance roadster segment there is nothing to compare to its combination of tangible driving dynamics, superior sportiness, unique technology and low fuel consumption. i Note Further details on the electrical systems of model series 172 (e.g. function descriptions and the locations of electrical components) are available in the Workshop Information System (WIS) under "Basic knowledge/functions" (GF).
Mercedes-Benz SLK 55 AMG with newly developed AMG 5.5-liter V8 engine
P00.00-4767-00
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Highlights
The Mercedes-Benz SLK 55 AMG is the most powerful SLK of all time. Its newly developed AMG 5.5-liter V8 engine M 152 DEH (direction injection homogeneous mode) featuring cylinder shutoff combines the ultimate in performance with the lowest possible fuel consumption. With its peak output of 310 kW (422 hp) and a maximum torque of 540 Nm the SLK 55 AMG outperforms all of its direct competitors. Its fuel consumption of 8.4 liters per 100 kilometers (NEDC combined) and CO2 emissions of 195 grams per kilometer are around 30 percent lower than those of its predecessor. High levels of driving dynamics are ensured thanks to the AMG sports suspension with Direct-Steer system, Torque Vectoring Brakes and 3stage ESP®, as well as the AMG high-performance braking system. High levels of driving dynamics are provided by the AMG sports suspension in combination with the AMGspecific Direct-Steer system. Long-distance comfort is enhanced by roadster innovations such as MAGIC SKY CONTROL, AIRSCARF and Airguide and the multimedia system. In the field of telematics, too, the SLK 55 AMG takes the lead with its standard-equipment Bluetooth® and COMAND Online (NTG 4.5) including internet access via UMTS. The SLK 55 AMG sets new standards when it comes to safety: a whole host of the latest assistance systems support the driver and have helped to secure the new AMG Roadster's exceptional position in its segment. Standard equipment includes new, fiber-reinforced roll-over bar, two-stage driver and front passenger airbags, head airbags, thorax airbags, buckle emergency tensioning retractors with degressive belt force limiting, NECK-PRO crash-active head restraints, automatic child seat recognition, 3-stage ESP® and also ATTENTION ASSIST drowsiness detection.
Innovative drive technologies
• "AMG Cylinder Management" (cylinder shutoff of 4 cylinders) • Full aluminum crankcase with ventilation bores and deck plate honed cylinder liners • AMG SPEEDSHIFT PLUS 7-speed automatic transmission with centrifugal pendulum in the torque converter for comfortable 4-cylinder operation • Valve assembly designed for high rpms (7200 rpm) • Continuous camshaft adjustment on the intake and exhaust sides • High compression of 12.6 for optimum fuel economy • Gasoline direct injection with piezo injectors and spray-guided combustion • Second-generation "Controlled Efficiency" with cylinder shutoff, alternator management and start/stop system • Combined water/oil cooling regulated according to demand • Electric exhaust flaps for comfortable sound characteristics
i Note For more information on the technical highlights listed here, see the Introduction into Service Manual "Introduction of the New SLK-Class Model Series 172 Roadster". Order No.: 6516 1382 02 - HLI 000 000 01 34
Introduction of the New SLK AMG, Model Series 172 b
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Overview
9
Brief description
Overview
Equipment
SLK 55 AMG Transmission AMG SPEEDSHIFT PLUS 7G-TRONIC Steering Direct-Steer Chassis Handling Package Sports suspension (including lowering) Wheels, tires, light alloy wheels 45.7 cm (18") AMG light alloy wheel "5-spoke design" Front: 235/40 ZR18 ET43 Rear: 255/35 ZR18 ET42 45.7 cm (18") AMG light alloy wheel "Multi-spoke design" - Himalaya gray Front: 235/40 ZR18 ET43 Rear: 255/35 ZR18 ET42 45.7 cm (18") AMG light alloy wheel "Multi-spoke design" - matt black Front: 235/40 ZR18 ET43 Rear: 255/35 ZR18 ET42 Tire pressure loss warner (ECE only) Tire pressure monitor (TPM) (USA only)
1 2
Standard
Standard
Code P30 Standard1
Standard Code 790
Code 796
Code 7602
Standard Code 475
Only available in combination with Handling Package Standard with Edition 1 special equipment
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b Introduction of the New SLK AMG, Model Series 172
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SLK 55 AMG Safety and theft protection Driver and front passenger airbags with 2-stage triggering, on-demand Knee airbag (USA only) Standard Standard Code 294 Standard Standard Code P541
Sidebag in seats Head airbag in doors Anti-theft alarm system (ATA) including interior monitoring (except USA)
Radio remote control (ECE only) Radio remote control with panic switch (USA only) Closing system with infrared remote control for Vario roof Pedestrian protection (active engine hood) (except USA) ATTENTION ASSIST Crash-active head restraints PRE-SAFE® (except USA)
1
Standard Standard Code 880 Standard Standard Standard Code 299
Standard in Japan
Introduction of the New SLK AMG, Model Series 172 b
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Overview
Equipment
Overview
Equipment
SLK 55 AMG Driving assistance systems Parking assist DISTRONIC PLUS including BAS PLUS and PRE-SAFE® brake1 Speed Limit Assist2 Hill Start Assist (HSA) including Hold function Climate control Air conditioning THERMOTRONIC air conditioning Roof systems Electrohydraulic Vario roof Panoramic Vario roof (tinted) Panoramic Vario roof with MAGIC SKY CONTROL Insertable frame draft stop Transparent pivoting draft stop (AIRGUIDE)
1 2
Code 230 Code 233 Code 513 Standard
Standard Code 581
Standard Code 415 Code 412 Code 2853 Code 283
Not at market launch Only available in combination with COMAND Online (not in USA, Canada, Japan) 3 Standard in Japan
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SLK 55 AMG Comfort systems Multifunction steering wheel Memory package - Electric seat adjustment for driver and front passenger including steering column and outside mirror adjustment Seat heaters Automatic child seat recognition (ACSR) in front passenger seat (except USA) Weight Sensing System (WSS) (USA only) Cupholder in center console including flexible bottle holder1 Tank with 70 l capacity Analog clock with IWC design AIRSCARF2 Light systems Halogen headlamps with LED daytime running lights in bumper Intelligent Light System including LED daytime running lamps (except USA) Interior lights package Ambiance illumination Illuminated door sills
1 2
Standard Standard
Code 8731 Standard Standard Code 309 Standard Code 246 Code 403
Standard Code 6213 Code 6224 Standard Code 877 U25
Standard in USA and Japan Standard with fabric/Artico 700A appointments in combination with code 873, optional with leather 800A/500A 3 Left-hand traffic 4 Right-hand traffic
Introduction of the New SLK AMG, Model Series 172 b
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Overview
Equipment
Overview
Equipment
SLK 55 AMG Telephone, audio and communications Comfort telephony (ECE only) Audio 20 Audio 20 including CD changer NavReady (preinstallation for Becker MapPilot) (ECE only) Becker MapPilot (ECE only) COMAND Online (ECE only) COMAND Online2 including DVD changer HD radio (USA only) SIRIUS satellite radio (USA only) Media Interface (UCI) Digital Audio Broadcasting (DAB) radio operation ECE harman/kardon® sound system TV tuner (Japan only) Emergency call system USA (Low Cost Teleaid = LCT) Compass in inside rearview mirror (USA only) AUX-IN jack including 12V power outlet USB interface in center console
1 2
Code 386 Standard ECE/USA Code 510 Code 508 Code 509 Code 5271 Code 512 Standard Code 536 Code 518 Code 537 Code 8101 Standard Code 359 Code 245 Standard Standard
Standard in Japan COMAND APS in USA
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Front view
The powerfully shaped front skirt is a demonstration of dynamics and elegance, clearly identifying the vehicle visually as a member of the Mercedes-Benz sports car family. The radiator grille surround is frameless and clear-cut. The character lines of the hood converge above the grille, their length and width emphasizing the sporty character of the car. The large air intake is bordered by the typical wings, producing an image of a stylized AMG-A. The outer air inlet openings are accentuated by the extended side surfaces. This optimizes the cooling air flow and reinforces the appearance of width at the front end. The AMG sports car image is for this model is characterized by optical features: below the central radiator grille the AMG-A is emphasized by a horizontal black bar. There is also a characteristic AMG LED daytime running lamp on the side air intake grille.
Front view
P00.00-4768-00
Introduction of the New SLK AMG, Model Series 172 b
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Overall vehicle
Exterior
Overall vehicle
Exterior
Side view
Oblong spoilers on the longitudinal member panels continue the form elements of the front and rear skirts and lend an air of power and agility. These form elements give the car the appearance of hugging the ground. The rear spoiler element intensifies the muscular shape of the fender and the power of the rear wheel drive. Black inserts in the side surfaces decorate the air outlets. There is also the "V8 AMG" on the fender. Horizontal fins lend the car potency and dynamism.
Side view
P00.00-4769-00
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Rear view
The car's rear skirt is dynamically shaped and reminiscent of a racing look. The powerful image is accentuated by a striking black panel with diffusor elements. The rear lamps are expressively connected to each other by a heavily pronounced line to emphasize the width of the car. This impression is enhanced by the AMG spoiler lip on the rear end. The AMG drive technology is represented by the four-pipe exhaust system, emphasizing the vehicle's sporty ambitions.
Rear view
P00.00-4770-00
Introduction of the New SLK AMG, Model Series 172 b
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Overall vehicle
Exterior
Overall vehicle
Technical data
Comparison of model series 171 AMG with model series 172 AMG
Unit Dimensions Vehicle length Vehicle width Vehicle width (with outside mirrors folded out) Vehicle height Wheelbase Front overhang Rear overhang Front track width Rear track width Coefficient of drag Cd mm mm mm 4099 1794 1973 4146 1817 2006 +47 +23 +33 R 171 AMG R 172 AMG Difference
mm mm mm mm mm mm
1277 2430 841 828 1526 1549 —
1300 2430 880 836 1635 1651 0.335
+23 0 +39 +8 +109 +102 —
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Unit Dimensions and weights Curb weight as per DIN Permissible gross vehicle weight Maximum payload (DIN) Luggage compartment volume with Vario roof open Luggage compartment volume with Vario roof closed Turning circle Fuel tank including reserve kg kg kg l l m l l
SLK 55 AMG
1535 1910 375 225 335 10.53 70 9
Introduction of the New SLK AMG, Model Series 172 b
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Overall vehicle
Technical data
Overall vehicle
Interior
Interior design
The interior compartment is elegant in a sporty way and deliberately reflects the dynamic impression of the exterior. In particular, the AMG sport steering wheel (flattened at top and bottom and perforated at the grips) and the AMG sport seats with AMG logo underscore its sporty character. This is further enhanced by illuminated, brushed steel AMG door sills and the unique AMG analog clock. The inner door panels and the center console have also been adapted to fit the sporty, dynamic style.
Color scheme
The black interior variant is enhanced by a contrasting decorative thread in the selector lever. In addition to the basic color variants, black and bengal red, the following variations will soon be available as special equipment: • Como beige with nappa leather: middle door panel and center console armrest in como beige • Como beige with exclusive nappa leather: as well as the door panel and center console, leather-clad instrument panel in como beige (upper part black leather, lower part como beige plastic)
Interior design
P68.00-6879-00
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Instrument cluster
The twin-tube instrument cluster features a display for showing information from the on-board computer located centrally between the two analog dial-type gauges. When the ignition is switched on, the pointers of the speedometer and tachometer move synchronously all the way to the end and then return to the zero position once. A new feature of the instrument cluster in the SLK AMG is the display for the cylinder shutoff (CSO) function.
Instrument cluster ECE version
P54.32-9770-00
Introduction of the New SLK AMG, Model Series 172 b
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Overall vehicle
Interior
Overall vehicle
Interior
Seats
The new SLK AMG is fitted with seats which meet the highly demanding, yet varied, requirements of customers in the area of seating comfort, ergonomics, safety and sportiness. These are AMG sport seats in fabric/ARTICO with the AMG logo. The designo leather seats are available in the following color variants: • • • • • • • • • • • • Classic red X17/83 Curcuma X42/52 Sand X10/77 Red pepper X41/51 Porcelain X27/87 Deep white X46/72 Jet black X39 Platinum white X30/60 Marron X06/96 Light brown X35/63 Pastel yellow X12/78 Titanium pearl X65 (edition1)
Seats
P91.00-2301-00
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New technical features
The engine oil change means that the SLK with the new AMG engine M 152 will have a basic maintenance interval of 20,000 km/12 months compared with the other SLK vehicles, which come in for a service at 25,000 km. The automatic transmission oil change is performed at 125,000 km/5 years.
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Maintenance
Maintenance intervals
Powerplant
Highlights
In the SLK-Class Mercedes-AMG will introduce the new 8-cylinder V engine M 152 DEH, replacing the highly successful engine model M 113 EVO in this class. This M 152 is uncompromisingly based on modularization and technological development, and combines performance with efficiency. Technically it is based on the M 157 biturbo engine launched in autumn 2010, and is a naturally aspirated engine with gasoline direct injection. In addition to the efficiency measures already familiar from the M 157, this engine also features "AMG Cylinder Management". The load-dependent shutoff of 4 cylinders significantly reduces the fuel consumption of the engine, particularly in partial load operation. Like all AMG engines the M 152 too is assembled at the AMG engine factory by hand. A highly qualified technician manufactures the engine according to the philosophy of "one man, one engine" and in compliance with the strictest quality standards. The characteristic AMG engine placard bears his signature as evidence that he has exercised the utmost care. The prominent features of the AMG V8 M 152 at a glance: • "AMG Cylinder Management" (cylinder shutoff of 4 cylinders) • Full aluminum crankcase with ventilation bores and deck plate honed cylinder liners • AMG SPEEDSHIFT PLUS 7-speed automatic transmission with centrifugal pendulum in the torque converter for comfortable 4-cylinder operation • Valve assembly designed for high rpms (7,200 rpm) • Continuous camshaft adjustment on the intake and exhaust sides • High compression of 12.6 for optimum fuel economy • Gasoline direct injection with piezo injectors and spray-guided combustion • Second-generation "Controlled Efficiency" with cylinder shutoff, alternator management and start/stop system • Combined water/oil cooling regulated according to demand • Electric exhaust flaps for comfortable sound characteristics
i Note Systems and components introduced with engine M 152 for the first time are described on the following pages.
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P01.10-3100-00
AMG V8 engine M 152 1 Spray-guided gasoline direct injection with piezo injectors 2 High-performance motor electronics with cylinder shutoff, stop/start function and alternator management 3 Continuous camshaft adjustment on the intake and exhaust sides 4 Full aluminum crankcase with ventilation bores and friction-optimized, deck plate honed cylinder liners 5 Weight-optimized intake manifold
Introduction of the New SLK AMG, Model Series 172 b
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Powerplant
Highlights
Powerplant
Engine data comparison M152 - M113 EVO
Unit Cylinder configuration/angle Rated output at engine speed Max. torque at engine speed Max. governed speed, soft Max. governed speed, hard Displacement Bore Stroke Cylinder spacing Number of valves/cylinder Compression ratio ε Connecting rod length Oil change quantity (with filter) Emissions regulation ECE/USA Cert. fuel type Engine weight DIN 70020 GZ kg — mm l 8.5 EU 4/LEV II kW rpm Nm rpm rpm rpm cm3 mm mm mm 3 11.0 146.5 9.5 EU 5/LEV II/ULEV 97.0 92.0 106.0 4 12.6 270 5750 510 4000 6500 6700 5461 98.0 90.5 M 113 EVO V8/90° 310 6800 540 4500 7000 7200 M 152
Super Plus RON 98 208
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Torque and power curves, M 152 and M 113 EVO
P01.00-3331-00
M P n
Torque M 152 Power M 152 Rpm
M P n
Torque M 113 EVO Power M 113 EVO Rpm
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Powerplant
Engine data comparison M152 - M113 EVO
Powerplant
Crankcase
The crankcase of the new M 152 is a full aluminum die-cast component. The low engine weight of only 208 kilograms (dry) is the result of committed lightweight design and results in a well-balanced load distribution in the vehicle. The low friction of the eight pistons is assured by the cast-in Silitec cylinder liners and in particular the fact that they are deck plate honed (a technique adopted from motor racing). The surface treatment of the cylinder liners involves mounting a deck stress plate on the cylinder head in order to simulate the assembled state and the associated static deformation of the crankcase. This ensures that the cylinder adopts the optimum shape in the assembled state. Above the bearing blocks are longitudinal bores (ventilation bores) which connect the adjacent crank chambers and provide effective pressure compensation between them. This reduces the friction losses of conventional pressure compensation via the oil pan. The bearing cap for the crankshaft main bearings is made of cast iron and is bolted to the crankcase from below and also from the side to guarantee high rigidity.
P01.40-2285-00
Full aluminum crankcase with ventilation bores and deck plate honed cylinder liners 1 Crankcase 2 Piston 3 Crankshaft
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Ventilation
The ventilation and venting system of engine M 152 consists of two oil separators, an oil mist separator with integral matting on the left cylinder head cover at the front and a centrifuge at the rear of the right cylinder head. The oil mist separator is a development of the separator of engine M 157. The centrifuge is unchanged. In partial load operation the engine is vented via the oil mist separator with an integrated restrictor in the direction of the intake manifold, and air is admitted via the wide open throttle line. In wide open throttle operation venting takes place via two air paths. There is the classic venting method via the centrifuge and initiated upstream of the throttle valve, and then there is additional venting via the oil mist separator with subsequent check valve, likewise initiated upstream of the throttle valve.
P01.20-2288-00
Crankcase ventilation A WOT venting B PL venting C Air admission 1 2 3 4 Oil mist separator with restrictor Restrictor Check valve Left cylinder head 5 6 7 8 Right cylinder head Intake manifold Centrifuge Throttle valve
Introduction of the New SLK AMG, Model Series 172 b
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Powerplant
Crankcase
Powerplant
Crank assembly
The forged crankshaft of high-grade steel alloy rotates in five main bearings, has eight counterweights and has been optimized with respect to torsional rigidity, inertia, low rotating masses and a long operating life. A two-mass viscous damper mounted at the front reliably eliminates vibrations. Each connecting rod journal on the crankshaft carries two forged, cracked connecting rods. The eight lightweight pistons are made of a newly developed casting material with the same material characteristics as a forging and, in the interests of low mechanical friction and high wear resistance, have a metallic contact surface and the DLC (diamond-like carbon) coated piston rings familiar from motor sport. Pressure-controlled oil spray nozzles in the crankcase ensure that the highly stressed piston crowns are efficiently cooled.
Crank assembly
P03.00-2043-00
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Perfect charging of the combustion chambers is ensured by large intake and exhaust valves, of which there are four per cylinder. The exhaust valves, which are subject to high thermal loads, are hollow and sodium-filled. Four overhead camshafts operate the 32 valves via low-maintenance, low-friction cam followers with hydraulic valve clearance compensation. The lightweight camshafts consist of an internal high-pressure formed steel tube with composite cams.
Due to the extreme thermal parameters of the combustion chamber, the heat transfer at the roof of the chamber has been optimized. The flow was optimized by designing the water jacket in two parts and a cooling slot has been added between the cylinders in the cylinder head. The cylinder head in the M 152 has the additional function of housing the cylinder shutoff system. This requires complex oil supply bores in the cylinder head to ensure actuation of the cylinder shutoff function, as well as housing the hydraulic actuator elements themselves.
Arrangement of valves
P05.00-2092-00
Introduction of the New SLK AMG, Model Series 172 b
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Powerplant
Cylinder head
Powerplant
Cylinder shutoff
"AMG Cylinder Management" cylinder shutoff
The cylinder shutoff function is available across a broad engine speed range from 800 to 3600 rpm. If the driver has selected the Controlled Efficiency transmission mode ("C") and requires only a low load, four of the eight cylinders are shut off. As soon as the driver demands more power and leaves the partialload range, cylinders 2, 3, 5 and 8 are reactivated. The transition from 4-cylinder to 8-cylinder mode occurs spontaneously, quickly and with neutral torque effect, so that ride comfort is not compromised. At an engine speed of 3600 rpm the activation process takes no more than 30 milliseconds. The shutoff of cylinders 2, 3, 5 and 8 is implemented by adjusting fuel injection and fuel ignition and by preventing the inlet and outlet of air by closing the intake and exhaust valves (see the illustration on page 34). To keep the valves closed, they are decoupled from the cam stroke by means of actuators; switchable hydraulic pivot elements in the cylinder heads drop below the camshaft within a few milliseconds and disconnect the valves from the camshaft.
A B C D E
Right cylinder head Left cylinder head Switchable cylinders Firing order Direction of travel
Firing order, M 152
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This system means that the masses of the valve assembly could be kept to a minimum, thus providing a more rigid and consistent valve train at high engine speeds in spite of the large gas cycle valves, and allowing the driver to operate the vehicle in a sporty style up to a maximum of 7200 rpm. The advantage of the cylinder shutoff system is the increase in efficiency in partial load operation by shifting the operating point of the active cylinders towards higher loads. An additional improvement in efficiency is achieved thanks to the reduction of gas cycle losses by closing the valves of the deactivated cylinders.
A comfortable ride in 4-cylinder mode, even at low rpms, is provided by a centrifugal pendulum integrated in the torque converter of the AMG SPEEDSHIFT PLUS 7-speed automatic transmission. It is designed to counteract and significantly reduce the main engine order vibrations. This is accomplished by deflecting the pendulums in the opposite direction to the vibration curve of the engine. The centrifugal pendulum acts as an rpm-adaptive damper which operates across the entire engine speed range.
P01.00-3332-00
Overview of cylinder 1 Intake camshaft 2 Intake port 3 Switchable compensating elements 4 Exhaust camshaft 5 Exhaust port
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Powerplant
Cylinder shutoff
Powerplant
Cylinder shutoff
Pivot elements in 8 and 4-cylinder mode
P05.30-2174-00
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Injection system and fuel supply
This is the first AMG naturally aspirated engine to feature spray-guided gasoline direct injection. Due to its high thermodynamic efficiency, this injection system brings crucial benefits in terms of fuel consumption and exhaust emissions. Piezo injectors operating especially quickly and accurately spray the fuel into the combustion chambers creating a homogeneous mixture cloud and ensuring particularly effective combustion. An electric low-pressure pump delivers the fuel at a pressure of 6 bar from the tank to two high-pressure pumps. The symmetrical arrangement of the two highpressure pumps relative to the cylinder banks has the advantage of optimizing the lengths of the high-pressure lines to the injectors to a minimum and of significantly reducing pulsations and vibrations compared with a one-sided configuration. The fuel pressure in the high-pressure rails is fully variable and is regulated between 100 and 200 bar according to requirements.
P07.00-2156-00
Injection system 1 2 3 4 5 Right rail Left rail Right high-pressure pump Left high-pressure pump Pressure gauge connection with service valve Fuel pressure and temperature sensor Cylinder 1 fuel injector Cylinder 2 fuel injector Y76/3 Y76/4 Y76/5 Y76/6 Y76/7 Y76/8 Y94/1 Y94/2 Cylinder 3 fuel injector Cylinder 4 fuel injector Cylinder 5 fuel injector Cylinder 6 fuel injector Cylinder 7 fuel injector Cylinder 8 fuel injector Left quantity control valve Right quantity control valve
B4/25 Y76/1 Y76/2
Introduction of the New SLK AMG, Model Series 172 b
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Powerplant
Injection system
Powerplant
Controlled Efficiency
When adapting the motor electronics with the new MED 17.7.3 engine control unit to engine M 152, the AMG engineers paid particular attention to the "Controlled Efficiency" ("C") transmission mode. The focus was on achieving the lowest possible engine speeds and the fewest possible shift operations in all driving situations. When moving off in "C", the transmission consistently selects second gear and, given an appropriate driving style, shifts up to the next gears noticeably early - in this way the vehicle is always operated in the highest possible gear, which reduces the overall rpm level. This benefits both consumption and noise development. Thanks to its favorable torque curve with plenty of power even at low engine speeds, the M 152 is virtually predestined for this kind of motion. Smooth gear changes and a "soft" accelerator pedal characteristic ensure that the vehicle pulls away gently. The control system of the lockup clutch, which is active from first gear, has been optimized for 4-cylinder operation. The stimuli initiated in the drivetrain by 8-cylinder and 4-cylinder operation differ in terms of order and are completely eliminated by means of intelligent actuation of the torque converter lockup clutch, enabling the torque converter to be bridged even in 4-cylinder mode. The useful "AMG Cylinder Management" range can thus be extended, reducing fuel consumption even more. The alternator management system and the start/stop function make a further contribution to fuel economy Whenever the engine is overrunning or while braking, kinetic energy is used to charge the battery rather than being converted into heat in the usual way. In all other operating ranges the combination of on-board electrical system management and alternator management enables the alternator to be kept at a low voltage. When the vehicle comes to a stop, the engine switches itself off automatically. When the brake pedal is released again or the accelerator is depressed, the engine restarts with no noticeable delay, and the car is able to move off quickly. The Smart Start function guarantees a comfortable and immediate starting procedure. The crankshaft sensor which recognizes the direction of rotation registers the resting position of all the pistons. For an automatic engine start, the cylinder with the most favorable piston position receives an injection of fuel into its combustion chamber. A framed "ECO" symbol in the AMG main menu shows the driver that the "Controlled Efficiency" start/stop function and "AMG Cylinder Management" are active.
Display in instrument cluster
P54.32-9785-00
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b Introduction of the New SLK AMG, Model Series 172
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An efficient oil supply in all load states and operating conditions is guaranteed by the oil pump with electrically controlled pressure stage. The oil pressure can be varied between 2 and 4 bar, which brings benefits in terms of friction power and fuel economy. Both the oil pan and the extraction point have been optimized with regard to maximum lateral acceleration and reliable lubrication. An auxiliary oil pump on the cylinder head boosts the oil pressure in order to guarantee sufficient oil pressure to switch the "AMG Cylinder Management" actuators even at high oil temperatures and low engine speeds, and therefore to enable 4-cylinder mode to be utilized across a broad rpm range. This ensures that there is always enough pressure in the supply gallery of the actuators to enable instant switching. When high load is required, this means immediate response even from 4-cylinder mode – as always in AMG vehicles.
One highlight is the combined water/oil cooling system, where the engine oil initially flows through the oil-water heat exchanger only. If the cooling output of the compact radiator is insufficient, the coolant flows through the external engine oil/air cooler via an oil thermostat. The advantage of this system is that the engine oil heats up faster because the coolant warms up more quickly in the warm-up phase and the oil is then cooled in the coolant. A switchable water thermostat ensures rapid heating of the coolant on engine start and in the subsequent warm-up process. The engine is water-cooled by the particularly efficient cross-flow principle. The coolant flows through both the crankcase and the cylinder heads in the transverse direction. Additional cooling slits in the cylinder head guarantee enhanced cooling of the combustion chamber, with benefits for combustion. Earlier firing points can be selected without running the risk of engine knock.
Introduction of the New SLK AMG, Model Series 172 b
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37
Powerplant
Oil and water circuits
Powerplant
Oil and water circuits
P18.00-2316-00
Oil circuit diagram, M 152 A B C D E 1 2 3 4 5 Right cylinder head Left cylinder head Crankcase Timing case Oil pan Oil pump Chain tensioner Intermediate gear Vacuum pump Oil cooler 6 7 8 9 10 11 12 13 14 15 Camshaft adjuster Oil filter CSO valve with check valve (RSV) Oil-air heat exchanger (ÖLWT) Oil-water heat exchanger (ÖWWT) Main oil duct Hydraulic valve compensating element (HVA) CSO element Plain bearing Piston sprayers
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b Introduction of the New SLK AMG, Model Series 172
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Exhaust treatment
Low exhaust emissions, compliance with all countryspecific limits and the typical engine sound characteristic of AMG – the demands on the exhaust system of the M 152 are diverse and complex. The M 152 DEH in model 172 complies with the current EURO 5 emissions standards as well as meeting all the requirements of the US market (ULEV, On-Board Diagnosis II and oxygen sensor diagnosis). The air gap-insulated exhaust manifolds guarantee the rapid response of the catalytic converters. The concept is efficient and space-saving with one tandem catalytic converter box on each side. Adjacent to the firewall, two thin-walled ceramic substrates are grouped into each housing. This solution makes the previous, additional underbody catalytic converters unnecessary. The two ceramic substrates differ in order to ensure rapid and efficient emissions control. The front one is coated with palladium, while the rear one has a bimetal coating of palladium and rhodium. One oxygen sensor per row of cylinders is located in front of each catalytic converter housing, and there is a diagnostic oxygen sensor between each of the two thin-walled substrates. The oxygen sensors are necessary for ensuring that lambda control is appropriate to requirements. This allows the composition of the intake mixture to be regulated exactly in all operating states so that the catalytic converters are not damaged. This also has benefits in terms of fuel consumption in wide open throttle mode because the mixture can be less rich than in engines without this control method.
P49.10-2793-00
Exhaust system 1 2 3 4 5 Firewall catalytic converter Front muffler Center muffler Rear muffler Exhaust flap G3/3 G3/4 G3/5 G3/6 Left oxygen sensor upstream of catalytic converter Right oxygen sensor upstream of catalytic conv. Left oxygen sensor downstream of catalytic converter Right oxygen sensor downstream of catalytic converter
Introduction of the New SLK AMG, Model Series 172 b
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39
Powerplant
Exhaust system
Powerplant
Exhaust system
Exhaust system
The complete twin-pipe AMG sports exhaust system has a pipe diameter of 65 millimeters all the way from the manifolds to the center muffler, and 60 millimeters in the rear exhaust system between the center muffler and the rear muffler. Each rear muffler ends in two tailpipes, and each inner tailpipe is fitted with an exhaust flap. The main focus of the sound design was on achieving a perfect synthesis of perceptible dynamism and the long-distance comfort that is a hallmark of Mercedes. The goals in development were: emotional under acceleration and when doubleclutching, subdued at constant speeds. Sophisticated trials have effectively suppressed irritating frequencies. The exhaust flap plays an important role in the sound design. At low engine loads the exhaust flap is usually closed, and begins to open only in the moderate load range and above (15%, 30%, 50%) until it is fully open at wide open throttle. Acoustically, therefore, the exhaust system combines the features of 4-cylinder and 8-cylinder engines, which differ essentially in the cross sections of the pipes and the internal structures of the mufflers. The striking twin tailpipes of the AMG sports exhaust system emit a sonorous 8-cylinder sound typical of AMG.
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b Introduction of the New SLK AMG, Model Series 172
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When the exhaust flap is open, the exhaust gas flows via the short, less soundproofed path through the inner tailpipes into the atmosphere. The exhaust flap is open from the moderate load range to maximum throttle.
Exhaust flap open
P49.10-2794-00
When the exhaust flap is closed, the exhaust gas flows via the long, heavily soundproofed path through the outer tailpipes into the atmosphere. The exhaust flap is closed at low to high loads and engine speeds up to 2000 rpm.
Exhaust flap closed
P49.10-2795-00
Controlled via a characteristics map, the exhaust flap assumes intermediate positions according to the requested torque and engine speed. This means that only an appropriate proportion of the maximum soundproofing effect is utilized, resulting in a smooth evolution of the sound level under acceleration. These intermediate positions are adopted at low to moderate loads.
Exhaust flap intermediate position
P49.10-2796-00
Introduction of the New SLK AMG, Model Series 172 b
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41
Powerplant
Exhaust system
Transmission
Transmission data
AMG SPEEDSHIFT PLUS 7-speed automatic transmission
The 7G-Tronic Plus automatic transmission already familiar from production vehicles is also used in the SLK 55 AMG. The essential new features of this 7G-Tronic Plus consist in advances in the torque converter and the main transmission to exploit potentials of energy efficiency and fuel economy. The new generation torque converter provides improved dynamic response coupled with reduced slip in the torque converter lockup clutch. This torque converter differs from the converter in production vehicles in the design of the double turbine torsional damper with centrifugal pendulum. As well as designing the dampers to handle the maximum engine torque, the centrifugal pendulum has been specially adapted for 4-cylinder operation. The rpmadaptive damper is always active during cylinder shutoff, while in 8-cylinder mode it plays only a minor role. The procedures aimed at improving fuel economy in the main transmission include friction-reducing measures for bearings and disks, and the introduction of a new low-viscosity automatic transmission fluid. As the entire tribological system has been optimized, including the bearings, sealing rings, gearing and friction plates, the new transmission oil is not backwardscompatible. For this reason it has been dyed blue for Service purposes instead of the previous red. The notes in Service Information bulletin SI00.40-P-0014A in WIS must be observed when using the new transmission oil. Optimized vehicle cooling, the improved oil formula and the reduction in friction throughout the entire transmission mean that the oil change interval has been extended from 50,000 km for the first change to every 125,000 km/5 years. Furthermore, the new seven-speed automatic transmission now also features start/stop capability. This is made possible by the introduction of the motordriven auxiliary transmission oil pump for the pressure supply when the fixed displacement pump is off. When the engine shuts off in ECO start/stop mode, the oil supply through the primary pump is interrupted. The auxiliary pump takes over the oil supply to the control elements and actuators of the automatic transmission. When the engine is restarted, the oil pressure built up by the auxiliary pump means that the vehicle is ready to move off immediately.
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b Introduction of the New SLK AMG, Model Series 172
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Technical data
Unit
SLK 55 AMG
Transmission model Transmission version
722.909 Planetary automatic transmission 7 + 2R kg mm Nm 93.7 628.3 700
Number of gears Weight (including converter and transmission fluid) Overall length Max. input torque
7-speed automatic transmission
P27.10-2403-00
Introduction of the New SLK AMG, Model Series 172 b
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43
Transmission
Transmission data
Chassis
Steering
Steering
The speed-dependent Direct-Steer system with direct steering ratio reduces the steering demand for large steering angles. This also reduces the steering requirement when parking to 2.2 steering wheel turns. The AMG-specific valve characteristic provides a noticeable improvement in steering comfort. The implementation of an AMG-specific characteristic in the ECO power steering pump guarantees accurate steering ability and improved vehicle agility. This results in an enhanced response in handling and at high speeds.
Steering
P46.40-2091-00
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b Introduction of the New SLK AMG, Model Series 172
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Front/rear axle
Due to the implementation of a stiffer strut rod bearing on the front axle, the elastokinematics in this area of the vehicle have changed. The modified hub/rotor assembly on the rear axle of the SLK AMG increases the camber to -2°. This makes the vehicle hug the ground both visually and in terms of handling characteristics. The kinematic modifications provide more grip and higher performance.
Introduction of the New SLK AMG, Model Series 172 b
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45
Chassis
Axles
Chassis
Suspension
Suspension systems
Beside the standard suspension, the AMG Performance suspension is also available for the new SLK AMG. A conventional steel suspension is installed as standard equipment. This consists of a wheel-carrying front suspension strut, a tubular torsion bar and double-tube shock absorber on the front axle, a solid torsion bar and single-tube shock absorber on the rear axle and rear axle springs.
Performance suspension
The optional Performance suspension, available in combination with the Handling Package, features stiffer dampers and harder springs compared to the standard suspension. These enhance roll stability, resulting in smaller roll angles when driving dynamically. The sports suspension is an option that can be combined with all the wheel sizes approved for the engine variant.
Torsion bar cross-sections
Unit
Cross-section of standard suspension 23.5 x 4 22 solid
Cross-section of Performance suspension 23.5 x 4 22 solid
Front axle Rear axle
mm mm
Chassis
P32.00-2066-00
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b Introduction of the New SLK AMG, Model Series 172
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Technical data Front brake system Type of brake
Unit
SLK 55 AMG
4-piston fixed caliper brake system One-piece, internally ventilated mm mm cm2
4-piston fixed caliper brake system Composite brake disk, internally ventilated 360 36
Brake disk design
Brake disk diameter Brake disk thickness Pad area Rear brake system Type of brake Brake disk design Brake disk diameter Brake disk thickness Pad area
2 x 95
1-piston floating caliper One-piece, internally ventilated mm mm cm2 330 22 2 x 39
i Note Due to the brake caliper which is installed, no additional brake pads are installed for the electric parking brake.
Brakes
P42.00-2169-00
Introduction of the New SLK AMG, Model Series 172 b
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Chassis
Brake system
Chassis
Wheels and tires
Front light alloy wheel Light alloy wheels Code 790 Code 796 Code 760 8J x 18H2 ET43 8J x 18H2 ET43 8J x 18H2 ET43 235/40 ZR 18 235/40 ZR 18 235/40 ZR 18 9J x 18H2 ET42 9J x 18H2 ET42 9J x 18H2 ET42 255/35 ZR 18 255/35 ZR 18 255/35 ZR 18 Front tire Rear light alloy wheel Rear tire
Code 790
P40.10-6131-00
Code 796
P40.10-6132-00
Code 760
P40.10-6133-00
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b Introduction of the New SLK AMG, Model Series 172
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Exterior lights
The SLK AMG is impressive because of its powerful design idiom. Its dynamic appearance is enhanced by darkened headlamps and rear lamps, and by the separately installed LED daytime running lamps in the front skirt.
Interior lights
The interior lights package is ideally supplemented by the ambiance illumination. This equipment package utilizes direct ambiance illumination in the door panels and center console and indirect ambiance illumination in the door handle to create an evocative atmosphere in the passenger compartment.
Daytime running lamps
P82.10-6840-00
Introduction of the New SLK AMG, Model Series 172 b
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Lights
Exterior and interior lights
Safety
Safety systems
Safe driving
Driving safety in the SLK AMG is further improved by the implementation of a three-stage ESP system. The previous ESP Sport Mode has been renamed Sport Handling Mode. In this mode the Sport lamp in the instrument cluster is permanently lit. The ESP OFF warning lamp is not actuated in Sport Handling Mode.
Restraint systems
The SLK AMG features three-point seat belts with degressive belt force limiting. Vehicles for the US market are equipped with an additional emergency tensioning retractor in addition to the lock tightening function.
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b Introduction of the New SLK AMG, Model Series 172
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Modern assistance systems effectively contribute towards accident avoidance. This was the result of analyses carried out by Mercedes-Benz based on representative data from accident research and the evaluation of real-life accidents. The Hill Start Assist (HSA) system, ATTENTION ASSIST and the Hold function are installed in the SLK AMG as standard. The following assistance systems are available as special equipment in the SLK AMG: • DISTRONIC PLUS including BAS PLUS and PRESAFE® brake: Assists the driver in maintaining his speed and distance to the vehicle in front and can provide specific braking assistance according to the situation in the case of emergency braking. The autonomous emergency braking function is not valid for the US market. • Speed Limit Assist: Can detect the signed maximum permissible speed and display it in the instrument cluster display and on the COMAND screen. • Parking assist with parking space detection: Can sense the distance from the vehicle to an obstacle and assists the driver when parking.
i Note For more information on the driver assistance systems listed here, see the Introduction into Service Manuals "Introduction of the New SLK-Class, Model Series 172 Roadster" Order No.: 6516 1382 02 and "Introduction of the New CLS-Class - Introduction into Service Manual for Model Series 218" Order No.: 6516 1381 02
i Note All the driving assistance systems are merely aids for the driver in controlling the vehicle in certain difficult situations. They can never replace a properly relaxed and attentive driver. The driver bears sole responsibility at all times for the safety of his vehicle and its behavior.
Introduction of the New SLK AMG, Model Series 172 b
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Driving assistance systems
Systems at a glance
Special tools
Engine
Hold-down device
Use For holding down the camshaft
P58.20-2386-00
MB number W152 589 00 40 00 FG 05 Set B Category Mercedes-Benz Car Special Operation
Note
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b Introduction of the New SLK AMG, Model Series 172
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AKSE Automatic child seat recognition (ACSR) AUX Auxiliary BAS Brake Assist System CMS Collision Mitigation System COMAND Cockpit Management and Data System Cd Coefficient of drag DAB Digital radio DEH Direct injection homogeneous mode DIN Deutsches Institut für Normung (German Standards Institute) DLC Diamond-like carbon
ET Wheel offset HSA Hill Start Assist HVA Hydraulic valve compensating element LCT Low Cost Teleaid LED Light-emitting diode NEFZ New European Driving Cycle (NEDC) NW Camshaft ÖLWT Oil-air heat exchanger ÖWWT Oil-water heat exchanger RDK Tire pressure monitor (TPM) RSV
ECO Economy
Check valve PL venting
EDW Anti-theft alarm system (ATA)
Partial load venting UCI
ESP Electronic Stability Program
Universal Consumer Interface ULEV II
EU5 Euro 5 standard (exhaust emission regulation)
Ultra Low Emission Vehicle (US exhaust emission regulation)
Introduction of the New SLK AMG, Model Series 172 b
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Annex
Abbreviations
Annex
Abbreviations
UMTS Universal Mobile Telecommunications System USB Universal serial bus WOT venting Wide open throttle venting WIS Workshop Information System WSS Weight Sensing System ZAS Cylinder shutoff (CSO)
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b Introduction of the New SLK AMG, Model Series 172
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Numerics
7G-Tronic Plus transmission . . . . . . . . . . . . . 42
F
Front view . . . . . . . . . . . . . . . . . . . . . . . 15
A
Ambiance illumination . . . AMG Cylinder Management Analog clock . . . . . . . . . ATTENTION ASSIST . . . . . AUX-IN . . . . . . . . . . . .
. . . . . . . . . . 13, 49 . . . . 9, 24, 32, 36, 37 . . . . . . . . . . 13, 20 . . . . . . . . . . . 9, 11 . . . . . . . . . . . . . 14
H
Head airbag . . . . . . . . . . . . . . . . . . . . . 9, 11 Hill Start Assist . . . . . . . . . . . . . . . . . . 12, 51
I
Instrument cluster . . . Instrument panel . . . . Intelligent Light System Interior design . . . . . Interior lights . . . . . . Internet access . . . . .
. . . . . . . . . . .21, 50, 51 . . . . . . . . . . . . . . . 20 . . . . . . . . . . . . . . . 13 . . . . . . . . . . . . . . . 20 . . . . . . . . . . . . . . . 49 . . . . . . . . . . . . . . . .9
B
BAS PLUS . . . . . . . . . . . . . . . . . . . . 12, 51 Becker MapPilot . . . . . . . . . . . . . . . . . . . . 14
C
Center console . . . Coefficient of drag . Color scheme . . . . Comfort telephony . Controlled Efficiency Crankcase . . . . . . Cylinder shutoff . . .
. . . . . . . . . . 13, 14, 20, 49 . . . . . . . . . . . . . . . . . 18 . . . . . . . . . . . . . . . . . 20 . . . . . . . . . . . . . . . . . 14 . . . . . . . . . . .9, 24, 32, 36 . . . . 9, 24, 25, 28, 29, 30, 37 . . . . . . . . . . . . . 9, 24, 31
K
Knee airbag . . . . . . . . . . . . . . . . . . . . . . 11
L
Light alloy wheels . . . . . . . . . . . . . . . . 10, 48 Light systems . . . . . . . . . . . . . . . . . . . . . 13
M
Market launch . . . . . . . . . . . . . . . . . . . . . 7 Media Interface . . . . . . . . . . . . . . . . . . . . 14
D
Daytime running lamps . Dimensions . . . . . . . Dimensions and weights Direct-Steer . . . . . . . DISTRONIC PLUS . . . .
. . . . . . . . . . . . . . . 49 . . . . . . . . . . . . . . . 18 . . . . . . . . . . . . . . . 19 . . . . . . . . . . . 9, 10, 44 . . . . . . . . . . . . 12, 51
P
Panoramic Vario roof . . Panoramic Vario roof with MAGIC SKY CONTROL . . Parking assist . . . . . . . Parking space detection . Pedestrian protection . . Pivoting draft stop . . . . Power outlet . . . . . . . PRE-SAFE® . . . . . . . .
. . . . . . . . . . . . . . 12 . . . . . . . . . . . . . . 12 . . . . . . . . . . . . 12, 51 . . . . . . . . . . . . . . 51 . . . . . . . . . . . . . . 11 . . . . . . . . . . . . . . 12 . . . . . . . . . . . . . . 14 . . . . . . . . . . . . . . 11
E
ECO power steering pump . . . . . . . . . . . . . . 44 Electric parking brake . . . . . . . . . . . . . . . . 47 Exhaust flap . . . . . . . . . . . . . . . . . . 9, 24, 40
Introduction of the New SLK AMG, Model Series 172 b
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Annex
Index
Annex
Index
R
Rear view . . . . . . . . . . . . . . . . . . . . . . . .17 Sports suspension . . . . . . . . . . . . . . 9, 10, 46 Start/stop function . . . . . . . . . . . . . . . . 36, 42
S
Safety systems . . . . Seat heaters . . . . . Seats . . . . . . . . . Side view . . . . . . . Sidebag . . . . . . . . Sound system . . . . Speed Limit Assist . . Sport steering wheel
. . . . . . . . . . . . . . . . .50 . . . . . . . . . . . . . . . . .13 . . . . . . . . . . . . . . . . .22 . . . . . . . . . . . . . . . . .16 . . . . . . . . . . . . . . . . .11 . . . . . . . . . . . . . . . . .14 . . . . . . . . . . . . . . 12, 51 . . . . . . . . . . . . . . . . .20
T
Tire pressure monitor . . . . . . . . . . . . . . . . 10 Torque Vectoring Brake . . . . . . . . . . . . . . . . 9
U
USB . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
V
Vehicle concept . . . . . . . . . . . . . . . . . . . . . 8
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b Introduction of the New SLK AMG, Model Series 172
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Daimler AG, GSP/OI, HPC R 822, D-70546 Stuttgart Order No. 6516 1386 02 - HLI 000 000 03 07 – Printed in Germany – 10/2011
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