3-4 TROUBLESHOOTING
Complaint Symptom and possible causes Remedy
Noisy engine Excessive valve chatter
• Too large valve clearance
• Weakened or broken valve springs
• Worn tappet or cam surface
• Worn and burnt camshaft journal
Noise seems to come from piston
• Worn down piston or cylinder
• Combustion chambers fouled with carbon
• Worn piston pin or piston pin bore
• Worn piston ring or ring groove
Noise seems to come from timing chain
• Stretched cam chain
• Worn sprockets
• Tension adjuster not working
Noise seems to come from clutch
• Worn splines of countershaft or clutch sleeve hub
• Worn teeth of clutch plates
• Distorted clutch plates, driven and drive
• Worn clutch release bearing
Noise seems to come from crankshaft
• Rattling bearings due to wear
• Worn and burnt big-end bearing
• Worn and burnt journal bearings
Noise seems to come from transmission
• Worn or rubbing gears
• Worn splines
• Worn bearings
Noise seems to come from water pump
• Worn or damaged impeller shaft
• Worn or damaged oil seal
• Contact between pump case and impeller
Adjust
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Clean
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Repair or replace
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