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Type :
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clutch plate
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Specification :
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Pulley :
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Brand :
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NUOJIN
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Number :
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A0212507603，0152507903
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Quality :
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new
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Delivery time :
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30 days
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The core of installing a Mercedes-Benz clutch friction disc lies in precise centering, correct orientation, compliance with torque specifications, and absolute cleanliness without oil contamination. It is necessary to replace the pressure plate and release bearing as a matched set, tighten the fasteners diagonally in stages, and complete centering and stroke adjustment to ensure smooth power transmission and long service life. Below are the standard procedures, tool list, key precautions, and test points.
Park the vehicle on a level surface, engage the handbrake and shift to neutral.
Disconnect the negative terminal of the battery to prevent accidental startup.
Wear heat-resistant gloves and safety goggles, and secure the flywheel with a dedicated tool (to avoid rotation).
Prioritize selecting Mercedes-Benz genuine parts or OE-certified clutch three-piece set (friction disc, pressure plate, release bearing).
Verify the compatibility with the vehicle model and engine type (e.g., M270, M274).
Inspect the friction disc splines, damper, and pressure plate diaphragm spring for no deformation or cracks.
Disconnect the shift cable and clutch slave cylinder oil pipe/cable.
Support the gearbox, remove the connecting bolts, and separate the gearbox slowly to avoid damaging the input shaft splines.
Mark the alignment positions between the flywheel and pressure plate for assembly reference.
Loosen the pressure plate bolts diagonally in stages (to prevent pressure plate deformation), then remove the pressure plate and old friction disc.
Inspect the flywheel end face (runout ≤ 0.1 mm) and pilot bearing (no seizure). Resurface or replace the parts if wear exceeds the limit.
Thoroughly clean the friction surfaces of the flywheel, pressure plate, and positioning pins with brake cleaner. Oil or grease contamination on friction surfaces is strictly prohibited.
Apply only a thin layer of grease to the spline hub and pilot bearing; keep all other friction components dry and clean.
Orientation Identification: The side marked "Transmission Side" or the protruding end of the friction disc must face the gearbox. Reverse installation will cause clutch release failure and component burnout.
Centering Installation: Insert the centering tool into the flywheel pilot bearing and friction disc spline hole to ensure coaxiality with the flywheel and input shaft. Apply a small amount of high-temperature grease (e.g., Mercedes-Benz specified MB 235.0) to the spline hub to ensure free sliding without seizure.
Pressure Plate Positioning: Align the pressure plate with the flywheel positioning pins and ensure tight fit without gaps. Install new bolts and hand-tighten them preliminarily.
Tightening Specifications: Tighten the bolts diagonally in three stages (1/3 torque → 2/3 torque → full torque) according to the Mercedes-Benz manual (common torque values: 25–30 N·m for M10 bolts, 40–45 N·m for M12 bolts; refer to model-specific WIS/ASRA data for exact values). Full torque tightening in a single step is prohibited to prevent pressure plate warping.
Release Bearing Installation: Mount the release bearing on the release fork, ensure the circlip is properly seated. No additional lubrication is required for pre-lubricated bearings. Apply a small amount of high-temperature grease to the contact points between the fork and bearing.
Clutch Slave Cylinder Reset: Retract the slave cylinder pushrod, reconnect the oil pipe, and bleed the hydraulic system to avoid air bubbles causing insufficient clutch release.
Gearbox Docking: Use the centering tool to guide the input shaft into the friction disc splines. Push the gearbox forward slowly until it fits tightly against the flywheel, ensuring the positioning pins are aligned correctly.
Bolt Tightening: Tighten the gearbox connecting bolts diagonally to the specified torque (e.g., 25 N·m for M10 bolts, 80 N·m for M14 bolts). Reconnect the clutch slave cylinder, shift mechanism, and cables.
Centering Verification: Rotate the crankshaft to check for no binding resistance. Press the clutch pedal lightly to ensure smooth stroke without abnormal resistance.
Reconnect the negative terminal of the battery.
Clear fault codes with a diagnostic tool (if applicable) and verify that the clutch position sensor signal is normal.
Free Travel: The clutch pedal free travel should be 10–15 mm (Mercedes-Benz standard). Calibrate via the slave cylinder pushrod or fork adjustment nut.
Release Point Check: Start the engine at idle speed, press the clutch pedal to shift gears without gear clash, ensuring complete clutch release with no drag. The engagement point should be smooth without jitter or abnormal noise.
These key precautions cover critical aspects including safety, orientation and centering, cleaning, fastening, lubrication, adjustment, and parts replacement for Mercedes-Benz clutch friction disc installation. Strict adherence to these guidelines prevents failures such as clutch release malfunction, vibration, and slipping, ensuring long-term durability of the system.
Power Disconnection to Prevent Accidental StartupDisconnect the negative terminal of the battery throughout the entire process to avoid short circuits or injuries caused by accidental engine startup. Secure the flywheel with a dedicated flywheel holder; never use the parking brake as a substitute.
Work Environment and Personal ProtectionPark the vehicle on a level surface, engage the parking brake, and shift to neutral. Wear heat-resistant gloves and safety goggles. Use compliant lifting equipment for gearbox hoisting; manual lifting is strictly prohibited.
Parts Compatibility CheckAlways select a Mercedes-Benz genuine or OE-certified clutch three-piece set (friction disc, pressure plate, release bearing). Verify compatibility with the vehicle model and engine type (e.g., M270, M274). Inspect the friction disc splines, damper, and pressure plate diaphragm spring for no deformation or cracks.
Alignment MarkingBefore disassembly, mark the alignment positions between the flywheel and pressure plate, as well as between the clutch cover and flywheel. This ensures reinstallation in the original position and prevents damage to the dynamic balance.
References：
The key precautions for Mercedes-Benz clutch friction disc installation are derived from the official Mercedes-Benz technical system. Below is a hierarchical breakdown of authoritative sources and supplementary explanations, which can be accurately traced back to original factory documents and industry standards.
This is the only official repair and parts inquiry system of Mercedes-Benz. It includes clutch disassembly/installation manuals and engine-gearbox operation specifications for various models (e.g., C-Class W205, E-Class W213, GLA 156, etc.). The system clearly defines core parameters such as:
Flywheel runout limit (≤ 0.1 mm)
Pressure plate bolt torque (e.g., 25–30 N·m for M10 bolts, 40–45 N·m for M12 bolts)
Clutch pedal free travel (10–15 mm)
Typical document number examples:
AR25.10-P-0050NKB (Clutch disassembly/installation, applicable to engines such as M270)
AR26.10-P Series (Supporting specifications for gearbox and clutch systems)
These documents are released and continuously updated by Daimler AG.
Corresponding to the AR Series service documents (e.g., AR25.10-P, AR26.10-P), these manuals detail standard operations such as:
Friction disc orientation identification (the side marked "Transmission Side" must face the gearbox)
Mandatory use of centering tools
Diagonal staged tightening procedures
Oil prohibition on friction surfaces
The content is fully consistent with the precautions provided to you.
Instructions for Original Clutch Three-Piece Set (friction disc + pressure plate + release bearing): These emphasize key requirements such as spline lubrication specifications (e.g., specified high-temperature lithium-based grease MB 235.0), pre-lubrication requirements for release bearings, and the non-substitutability of high-strength bolts.
Technical Training Documents: These focus on practical operation specifications including safe power disconnection, flywheel fixation, and hydraulic system bleeding.
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