SERVICING INFORMATION 10-9 Complaint Symptom and possible causes Remedy Noisy engine Excessive valve chatter 1. Too large tappet clearance Adjust. 2. Weakened or broken valve springs Replace. 3. Worn tappet or cam surface Replace. 4. Worn and burnt camshaft journal Replace. Noise seems to come from piston 1. Worn down pistons or cylinders Replace. 2. Carbon combustion chambers fouled with carbon Clean. 3. Worn piston pins or piston pin bore Replace. 4. Worn piston rings or ring grooves Replace. Noise seems to come from timing chain 1. Stretched chain Replace. 2. Worn sprockets Replace. 3. Tension adjuster not working Repair or replace. Noise seems to come from clutch 1. Worn splines of countershaft or hub Replace. 2. Worn teeth of clutch plates Replace. 3. Distorted clutch plates, driven and drive Replace. 4. Worn clutch release bearing Replace. E 5. Weakened clutch dampers L Replace the primary P driven gear. Noise seems to come from crankshaft 1. Rattling bearings due to wear Replace. M Replace. 2. Worn and burnt big-end bearings 3. Worn and burnt journal bearings Replace. A Replace thrust bearing. 4. Too large thrust clearance Noise seems to come from balancer S 1. Worn and burnt journal bearings Replace. Noise seems to come from transmission 1. Worn or rubbing gears Replace. 2. Worn splines Replace. 3. Worn or rubbing primary gears Replace. 4. Worn bearings Replace. Noise seems to come from water pump 1. Too much play on pump shaft bearing Replace. 2. Worn or damaged impeller shaft Replace. 3. Worn or damaged mechanical seal Replace. 4. Contact between pump case and impeller Replace.