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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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A0212509903 0212502503 0212503403
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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 principles for installing a Mercedes-Benz clutch friction disc (driven plate) are centering, correct orientation, torque compliance, and contamination prevention. Strict adherence to the original factory manual can avoid uneven wear, incomplete disengagement, and premature component failure. Below are the universal standard procedures, key precautions, and test points, applicable to mainstream rear-wheel drive/front-wheel drive models (e.g., W204/W212/Class A, etc.).
Park the vehicle on a level surface, engage the parking brake, and shift to neutral. Disconnect the negative battery terminal to prevent accidental engine startup and electrical short circuits.
Secure the flywheel with a dedicated tool (to prevent rotation); use a support bracket when hoisting the transmission to avoid input shaft deformation caused by excessive stress.
Wear oil-resistant gloves and safety goggles. Maintain a dry and clean operating environment, and strictly prohibit oil contamination on friction surfaces.
Prioritize choosing Mercedes-Benz genuine parts or OE-certified clutch kits (friction disc, pressure plate, release bearing). Verify compatibility with the vehicle model and engine type (e.g., M271, OM651) to ensure the friction disc splines, alignment marks, and pressure plate match perfectly.
Inspect the friction disc for no oil contamination, loose rivets, or broken damping springs; check that the pressure plate diaphragm spring has uniform elasticity; confirm the release bearing rotates smoothly without seizure or abnormal noise.
Transmission Removal: Disconnect the shift cable, clutch hydraulic line/slave cylinder, and wiring connectors. Remove the transmission mounting bolts, then separate the transmission from the engine using a lifting frame and move it to a safe location.
Pressure Plate and Old Disc Removal: Loosen the pressure plate bolts in a diagonal, staged sequence (to prevent pressure plate deformation), then remove the pressure plate and old friction disc. Mark alignment marks on the flywheel and pressure plate (for balance calibration during reinstallation).
Cleaning and Inspection:
Clean the flywheel mating surface and pressure plate friction surface with anhydrous ethanol to remove oil, rust, and wear debris. Never use dry brushing or compressed air blowing for cleaning.
Check that the flywheel runout ≤ 0.1mm and there are no grooves on the surface; inspect the pressure plate diaphragm spring for fatigue cracks; ensure the guide bearing rotates smoothly and replace it if worn.
Check the release fork and release bearing housing for deformation; replace them if necessary.
Apply a small amount of high-temperature grease to the guide bearing; coat the friction disc spline hub with a dedicated molybdenum-based grease (thin layer only—avoid contaminating friction surfaces).
Orient the friction disc according to the marks: typically, the side marked "Transmission Side" or with a raised locating surface should face the transmission. Incorrect orientation will cause incomplete disengagement and component damage.
Insert the centering tool into the flywheel guide bearing and friction disc spline bore to ensure the friction disc is perfectly centered with the flywheel. Place the pressure plate in position, aligning it with the locating pins and pre-marked alignment marks.
Tighten the pressure plate bolts in 3–4 incremental stages following a diagonal sequence. Final torque must comply with original factory specifications (commonly 25–35N·m, refer to the vehicle-specific manual for exact values).
Apply a small amount of thread-locking adhesive to the bolt threads if specified. Never over-tighten (to avoid pressure plate deformation) or under-tighten (which will cause loose bolts and abnormal noise).
Remove the centering tool and manually rotate the friction disc to confirm it spins freely without binding.
Install a new release bearing, ensuring it slides smoothly on the release fork; apply high-temperature grease to the contact interfaces. Install the release fork return spring and verify it has proper tension.
Check the clutch slave cylinder/release pushrod stroke to ensure the clearance between the release bearing and diaphragm spring tips meets specifications (commonly 1–2mm).
Clean the transmission input shaft splines and apply a thin layer of grease. Align the transmission with the engine and slowly push it forward to insert the input shaft into the friction disc spline bore—avoid impact or forced installation.
Tighten the transmission mounting bolts to the specified torque. Reconnect the hydraulic lines, wiring harnesses, and shift mechanism, then bleed the hydraulic clutch system.
These precautions cover six critical dimensions: safety protection, correct orientation and centering, contamination prevention, torque control, system compatibility, and post-installation testing/break-in. Strict adherence prevents failures such as friction disc burnout, incomplete disengagement, and judder during start-up, ensuring long-term stable operation of the clutch system.
Disconnect the negative battery terminal throughout the entire process to prevent accidental starter motor activation, which could cause mechanical impact or electrical short circuits.
Use a dedicated support bracket when hoisting or removing the transmission—never leave it suspended under its own weight, as this will deform the input shaft.
Maintain a dry, clean workspace and wear oil-resistant gloves and safety goggles.
Never work on a hot engine to avoid burns or thermal deformation of components.
References：
The sources of these installation precautions for Mercedes-Benz clutch friction discs are divided into core authoritative sources (precisely traceable) and supplementary reference sources (industry-wide standards and practical experience integration). Below is a hierarchical breakdown with traceability basis:
As Mercedes-Benz’s official and exclusive repair and technical specification platform, it covers clutch disassembly/installation manuals, torque parameters and assembly procedures for all models (e.g., W204/W212/Class A) matching their respective engines (e.g., M271/OM651). Typical document numbers include the AR25.10-P series (e.g., AR25.10-P-0050NKB, applicable to models 156/246, etc.). It clearly specifies key requirements such as diagonal staged tightening of pressure plate bolts, a torque range of 25–35N·m, friction disc centering standards, and a release bearing clearance of 1–2mm. These documents are published and continuously updated by Daimler AG.
Corresponding to the implementation documents in the WIS system, they detail standard procedures including power disconnection, flywheel securing, friction disc orientation (per the "Transmission Side" marking), centering tool application, and grease application limits. These guidelines are fully consistent with the requirements specified in the precautions, such as "strictly prohibiting oil contamination on friction surfaces" and "marking alignment marks before pressure plate removal".
The accompanying instructions for genuine clutch kits emphasize component compatibility, spline lubrication specifications, and inspection points for damping springs and rivets. Technical training documents focus on practical specifications including safety protection, hydraulic system bleeding, and pedal stroke calibration, covering maintenance recommendations such as "500–1000km break-in period for new friction discs".
Standards such as GB/T 15742-2019 Technical Conditions for Automobile Clutch Maintenance specify general requirements for friction disc installation, including centering accuracy, pressure plate flatness, and release clearance. These align with original factory specifications, ensuring unified basic standards for insulation protection, torque control, and contamination prevention.
Integrating long-term practical experience from Mercedes-Benz authorized service technicians and case studies from overseas Mercedes-Benz repair communities (e.g., Mercedes-Benz Forum), this section supplements common pitfall avoidance tips—such as uneven wear caused by omitting centering tools and slipping issues resulting from grease contamination on friction surfaces—thereby enhancing the document’s error tolerance and practicality.
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