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10-8 SERVICING INFORMATION
Complaint Symptom and possible causes Remedy
Noisy engine Excessive valve chatter
1. Too large tappet clearance
2. Weakened or broken valve springs
3. Worn tappet or cam surface
4. Worn and burnt camshaft journal
Noise seems to come from piston
1. Worn down pistons or cylinders
2. Carbon combustion chambers fouled with carbon
3. Worn piston pins or piston pin bore
4. Worn piston rings or ring grooves
Noise seems to come from timing chain
1. Stretched chain
2. Worn sprockets
3. Tension adjuster not working
Noise seems to come from clutch
1. Worn splines of countershaft or hub
2. Worn teeth of clutch plates
3. Distorted clutch plates, driven and drive
4. Worn clutch release bearing
5. Weakened clutch dampers
Noise seems to come from crankshaft
1. Rattling bearings due to wear
2. Worn and burnt big-end bearings
3. Worn and burnt journal bearings
4. Too large thrust clearance
Noise seems to come from balancer
1. Worn and burnt journal bearings
Noise seems to come from transmission
1. Worn or rubbing gears
2. Worn splines
3. Worn or rubbing primary gears
4. Worn bearings
Noise seems to come from water pump
1. Too much play on pump shaft bearing
2. Worn or damaged impeller shaft
3. Worn or damaged mechanical seal
4. Contact between pump case and impeller
Adjust.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace the primary
driven gear.
Replace.
Replace.
Replace.
Replace thrust bearing.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.