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Type :
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clutch pressure plate
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Specification :
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Pulley :
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14T
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Brand :
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NUOJIN
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Number :
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93175343
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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 installation of the clutch pressure plate and friction disc (driven disc) is a core part of the clutch assembly process. Three critical principles—coaxial alignment, correct orientation, and standardized torque application—directly determine the clutch’s operational smoothness and service life. Below is a universal standardized installation method applicable to manual - transmission passenger vehicles, including mainstream brands such as MG, Ford, and Peugeot.
Flywheel Face Cleaning: Use a special - purpose cleaner to remove oil stains, rust, and wear debris from the flywheel face. Wipe it dry to ensure no residual grease remains. Employ a dial indicator to measure the flywheel’s axial runout; the maximum allowable value is ≤0.15mm. If the runout exceeds this limit, the flywheel must be ground or replaced. Otherwise, it will lead to clutch judder and abnormal noises.
Pressure Plate Inspection: Check the height difference of the diaphragm spring fingers on the pressure plate; the maximum allowable value is ≤0.5mm. If the heights are inconsistent, correct them using a special tool. Failure to do so will result in incomplete clutch disengagement and difficulty in gear shifting. Ensure there are no cracks or burn marks on the pressure plate’s friction surface.
Friction Disc Inspection: Confirm that the friction disc is free of oil contamination and that its rivets are not exposed (the rivet depth should be ≥0.3mm). Verify that the spline specifications match those of the transmission input shaft, and ensure the disc rotates smoothly without jamming.
Special Tools: Clutch alignment tool (a core tool to ensure coaxiality between the friction disc and the crankshaft), flywheel holding tool (to prevent crankshaft rotation), torque wrench (5–50N・m), and socket set.
Consumables: Lithium - based high - temperature grease (for splines only; never allow contact with friction surfaces) and new pressure plate bolts (it is advisable to replace them once; bolts with anti - loosening design cannot be reused).
The friction disc is usually marked with “Flywheel Side” (facing the flywheel) or “Trans Side” (facing the transmission). Install it strictly in accordance with these markings.
For unmarked discs, determine the orientation based on the following rules:
The side with protruding damping springs faces the transmission.
The side with the longer splined hub faces the transmission.
Reversed installation will cause insufficient clutch travel, failure to disengage, and severe damage to the friction disc due to overheating.
Lock the flywheel with a flywheel holding tool to prevent crankshaft rotation.
Apply a very thin layer of lithium - based high - temperature grease to the friction disc’s splines. Wipe off any excess grease to avoid contaminating the friction surfaces.
Insert the clutch alignment tool into the friction disc’s splines, and then accurately insert the other end of the tool into the crankshaft pilot bearing bore. Adjust the friction disc’s position to ensure it fits perfectly parallel to the flywheel face without tilting or gaps.
Pressure Plate Positioning: Fit the pressure plate smoothly over the outside of the friction disc. Align the pressure plate’s bolt holes with those on the flywheel to ensure the pressure plate fully contacts the flywheel face with no gaps.
Standardized Bolt Tightening (Core Step):
Hand - tighten all pressure plate bolts (typically 6 bolts) until the pressure plate is just secured without looseness.
Tighten the bolts in 3 sequential passes following a crisscross pattern using a torque wrench. Tighten them to the specified torque (the general value is 25–30N・m; refer to the vehicle - specific manual for the exact value, with a torque deviation ≤±2N・m).
After tightening, recheck the coaxiality of the friction disc and pressure plate. There should be no noticeable looseness when wiggling the alignment tool.
After confirming that all pressure plate bolts are properly tightened, slowly pull out the alignment tool vertically. Avoid prying it at an angle or pulling it forcefully, as this may displace the friction disc.
Manually rotate the pressure plate to check that the friction disc operates without jamming or uneven wear, and that the diaphragm spring fingers move freely without sticking.
This set of precautions focuses on four core principles: orientation compliance, coaxial alignment, torque control, and contamination prevention. It refers to the general technical specifications for automobile clutch installation and the service manuals of mainstream vehicle manufacturers, and is applicable to the assembly of pressure plates and friction discs in manual - transmission passenger vehicles.
Oil stains, water stains, and metal debris must not remain on the flywheel face, pressure plate friction surface, and friction disc friction surface. Use a special - purpose clutch cleaner for cleaning; gasoline and diesel are prohibited (they tend to leave an oil film that causes clutch slippage). After cleaning, wipe the surfaces dry with a clean, lint - free cloth to avoid fiber residue.
The flywheel’s axial runout must be ≤0.15mm. Forced installation is strictly forbidden if the runout exceeds this limit, as it will lead to clutch judder and abnormal noises, and in severe cases, uneven wear of the friction disc. The height difference of the diaphragm spring fingers on the pressure plate should be ≤0.5mm. If the heights are inconsistent, correct them with a special tool; tapping to correct is not allowed (it may cause the spring to break).
The depth of the friction disc rivets should be ≥0.3mm. If the rivets are exposed (flush with or protruding from the friction surface), the friction disc must be replaced immediately, otherwise the friction surfaces of the flywheel and pressure plate will be scratched. Check the fit clearance between the friction disc splines and the transmission input shaft; the disc should rotate smoothly without jamming. If the clearance is too large, replace the friction disc.
References：
These authoritative sources are categorized into four types: core authoritative sources, industry general standards and specifications, third - party authoritative references, and practical operation integration. All sources are traceable and verifiable, serving as the technical basis for the installation of pressure plates and friction discs in manual - transmission passenger vehicles.
General Technical Specifications for Auto Maintenance: It specifies diagonal tightening in 2–3 passes, bolt torque deviation of ±2N・m, centering requirements for clutch driven discs, and the principle of complete replacement of new parts, providing a benchmark for consistent industry installation.
General Specifications for Brake Fluid/Hydraulic Systems: DOT 4 brake fluid (also used as clutch fluid) application standards and anti - leakage requirements for hydraulic line connections, which are applicable to the maintenance of clutch hydraulic systems.
General Technical Rules for Automobile Clutch Installation: It clarifies the orientation marking of driven discs, the prohibition of oil contamination on friction discs, and the usage specifications of lithium - based high - temperature grease for release bearings, serving as the core operational basis for maintenance enterprises.
General Specifications for Construction and Acceptance of Mechanical Equipment Installation Engineering (GB 50231 - 2009): It provides general assembly principles such as friction pair cleaning, coaxiality control, and bolt tightening, which are applicable to the installation of mechanical components like automobile clutches.
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