ENGINE TROUBLESHOOTING (CONT)
TEST OR INSPECTION
10. LOUD CLICKING NOISE FROM VALVE COMPARTMENT
Step 1. Check for damaged springs or locks on valves.
Step 2. Check lubrication in valve compartment.
Look for a strong flow of oil at high rpm and a small flow of oil at low rpm. If there is little or
no oil flow from all passages, repair engine oil pump. If there is little or no oil flow from one
passage, but a sufficient flow from other passages, then the passage is clogged. Clean the passage.
Step 3. Check for too much valve clearance. (See page 3-268.)
Step 4. Check for damaged valve bridge.
Step 5. Inspect for bent push rods.
Step 6. Remove and inspect camshaft.
Step 7. Inspect valve lifters.
Inspect camshaft lobes for damage from lifters. (See page 3-283.)
11. LOUD MECHANICAL NOISE IN ENGINE
Step 1. Inspect timing gears for damage.
Step 2. Inspect camshaft for damage.