Automobile clutch pressure plate 1312201821 1-31220182-1 1-31220-182-1 ISC534 for Isuzu FSR FTR 6HE1 6HH1

Pre-installation Preparation

• For tools, prepare a torque wrench, socket wrench, special guide shaft (can be replaced with a corresponding model drive shaft), cleaning cloth, lithium-based grease, etc.

• Select a pressure plate assembly matching the Isuzu model. Check that the new pressure plate is free of deformation, the diaphragm spring is undamaged, and the supporting clutch disc and release bearing are also in good condition.

• Lift the vehicle stably with a jack and secure it on stands. Disconnect the negative battery terminal, remove the drive shaft and transmission assembly to expose the clutch assembly.

• Before disassembly, mark the alignment between the clutch cover and the flywheel to facilitate subsequent assembly and restoration.

Cleaning and Inspection of Old Components

• Remove the fixing bolts of the old pressure plate, take off the old pressure plate and clutch driven disc.

• Thoroughly clean the flywheel surface with a cleaning cloth to remove oil stains, metal debris and rust. If the flywheel surface has cracks, severe wear or flatness exceeding 0.2mm, it needs to be ground, repaired or replaced.

• Inspect the release fork and release bearing. Replace the bearing if it rotates with jamming or abnormal noise.

• Clean impurities from the spline of the transmission input shaft to ensure smooth subsequent assembly.

Positioning and Installing the Pressure Plate

• Place the clutch driven disc between the flywheel and the pressure plate. Insert the special guide shaft through the center hole of the driven disc and align it with the flywheel guide bearing to ensure concentricity of the driven disc, flywheel and pressure plate.

• Note that the side of the driven disc with the damper plate must face the pressure plate.

• Take the new pressure plate assembly, align the assembly marks made earlier on the flywheel and clutch cover. Ensure the positioning holes on the pressure plate are accurately connected to the positioning pins on the flywheel to avoid installation misalignment.

Tightening the Pressure Plate Bolts

• Initially fix the pressure plate with matching bolts, do not tighten them all at once.

• Subsequently, use a torque wrench to gradually tighten the bolts in a diagonal cross sequence. The common tightening torque for Isuzu model pressure plate bolts is approximately 25-30N・m (refer to the corresponding model's maintenance manual for specific values).

• Avoid uneven force that may cause pressure plate deformation and affect clutch engagement.

Assembling Peripheral Components

• Pull out the special guide shaft. Apply lithium-based grease to the release bearing, release fork fulcrum and other parts.

• Install the release bearing to ensure it fits the inner end of the diaphragm spring and rotates flexibly without jamming.

• Assemble the clutch master cylinder, release fork and other components in sequence. Ensure the two ends of the release fork are concentric to avoid affecting the clutch release stroke later.

Resetting and Commissioning Inspection

• Reinstall the transmission in the reverse order of disassembly. Tighten the connecting bolts between the transmission and the engine, then reinstall the drive shaft and other components. Reconnect the negative battery terminal.

• After starting the vehicle, step on the clutch pedal to check if the stroke is normal (usually the free stroke is 15-25mm) and feel that the pedal has no jamming.

• Test gear shifting for smoothness. During driving, observe if the clutch engages smoothly and disengages completely. The installation is qualified if there are no abnormalities such as slipping or abnormal noise.

1. Component Alignment and Direction Taboos

• Retain or re-mark the alignment marks between the flywheel and pressure plate cover to ensure consistent dynamic balance of the clutch assembly after installation and prevent vibration during high-speed operation.

• Never reverse the direction of the clutch driven disc. The side with the damper plate (usually marked "Face the pressure plate") must face the pressure plate; otherwise, it will cause incomplete disengagement and difficult gear shifting.

• The positioning holes on the pressure plate must be accurately fitted over the positioning pins on the flywheel. Do not force-tighten the bolts before alignment to avoid deformation of the pressure plate base.

2. Bolt Tightening Specifications

• Use the diagonal cross-step tightening method throughout the process. Gradually apply force in 3-4 stages until reaching the standard torque; never fully tighten a single bolt at one time.

• Strictly follow the torque requirements specified in the corresponding model's maintenance manual (common torque for Isuzu is 25-30N・m, and up to 35N・m for some heavy-duty models). Insufficient torque may cause loosening, while excessive torque can deform the pressure plate or flywheel.

• Install lock washers for the bolts (usually included with new pressure plates). Replace aged or missing washers to prevent bolt loosening during vehicle operation.

3. Key Points for Cleaning and Lubrication

• Keep the flywheel surface, pressure plate working surface, and driven disc friction plate absolutely clean and dry. Avoid oil contamination, as it will cause clutch slipping and abnormal noise.

• Apply a small amount of lithium-based grease only to the inner ring of the release bearing, release fork fulcrum, and splines of the transmission input shaft. Use an appropriate amount to prevent excess grease from splashing onto the friction plate.

• Inspect the diaphragm spring of the pressure plate before installation to ensure all springs have consistent height and no deformation or fatigue. Replace the pressure plate assembly if any issues are found.

4. Post-Assembly Commissioning and Fault Troubleshooting

• First check the clutch pedal free stroke after installation, which should be between 15-25mm. Adjust the push rod length if it does not meet the requirement to avoid incomplete disengagement (due to excessive free stroke) or semi-linkage slipping (due to insufficient free stroke).

• After starting the vehicle, step on the pedal in neutral to ensure smooth movement without jamming or hesitation. Test gear shifting for no gear collision noise, and check for smooth engagement and no vibration during driving.

• If incomplete disengagement occurs (difficult gear shifting), inspect whether the pressure plate is correctly aligned and the driven disc is installed in the right direction. If slipping occurs (weak acceleration or abnormal odor), check the bolt torque or for oil contamination on the friction plate.

5. Safety and Tool Requirements

• After lifting the vehicle, secure it with qualified stands. Never rely solely on a jack for support. Use a stand to hold the transmission during removal to prevent damage to components or personal injury from falling.

• Must use a torque wrench to control the tightening torque. Do not tighten by hand feel with a regular wrench. Ensure the tool size matches the bolts to avoid thread stripping.

• Avoid direct contact with the friction plate working surface with hands during installation to prevent oil contamination. Also, avoid scratching the friction plate and pressure plate working surface with hard objects.

References：

General Automotive Maintenance Standards and Industry Consensus

Isuzu Model-Specific Maintenance Experience and Parts Instructions

Basic Technical Points in Automotive Maintenance