Clutch: Testing and Inspection

CLUTCH COVER INSPECTION





1. Measure the wear of the diaphragm spring fingers.
Depth 0.5 mm (0.020 inch) maximum





2. Measure the flatness of the pressure plate surface using a straightedge and a feeler gauge as shown in the figure.
Maximum clearance 0.5 mm (0.020 inch)

Note:
^ When inspecting the diaphragm spring fingers, mount a dial indicator on the cylinder block.





3. Rotate the flywheel and inspect for misaligned diaphragm spring fingers.
^ If the misalignment exceeds the maximum, replace the clutch cover.
Misalignment 0.6 mm (0.024 inch) maximum

CLUTCH DISC INSPECTION
1. Inspect the contact surface of the clutch disc for scoring, cracks, burning, and oil contamination.
2. Remove minor coring or burning using emery paper
^ Repair if scoring or burning is major.
^ Replace if cracked or contaminated with oil.





3. Inspect for loose facing rivets and dampers.
^ If the clutch disc is loose, replace the clutch disc.





4. Using vernier calipers, measure the thickness of the lining at a rivet head on both sides.
^ If the thickness of the lining at any rivet head is less than the minimum, replace the clutch disc.
Thickness 0.3 mm (0.012 inch) minimum





5. Measure the clutch disc runout using a dial indicator.
^ If the runout exceeds the maximum, replace the clutch disc.
Runout 0.7 mm (0.028 inch) maximum

CLUTCH RELEASE COLLAR INSPECTION

Caution:
- Cleaning the clutch release collar with cleaning fluids or a steam cleaner can wash the grease out of the sealed bearing.





1. Turn the collar while applying force in the axial direction.
^ If the collar sticks or has excessive resistance, replace it.

PILOT BEARING INSPECTION





1. Without removing the pilot bearing from the flywheel, turn the bearing while applying force in the axial direction.
^ If the bearing sticks or has excessive resistance, replace it.

FLYWHEEL INSPECTION
1. Inspect the contact surface for scoring, cracks, and burning.





2. Remove minor scoring or burning using emery paper.
^ Repair if scoring or burning is major.
^ Replace if cracked.
3. Inspect the ring gear teeth for wear and damage.
^ If worn or damaged, replace the flywheel.
4. Install a dial indicator on the cylinder block.





5. Measure the flywheel runout using a dial indicator.
^ If the runout exceeds the maximum, replace the flywheel.
Runout 0.2 mm (0.0079 inch) maximum