G424 Service Manual Adjustment and Troubleshooting175
Engine Noise (Continued)
Symptom Cause
5. Noise in camshaft area A. Valve lifter.
(center of engine). B. Cam bearings.
6. Noise in camshaft area A. Valve lifter.
(rear of engine). B. Cam bearings.
7. Noise in crankshaft area A. Loss of oil pressure.
(throughout engine). B. Main bearings.
C. Rod bearings.
8. Noise in crankshaft area A. Crankshaft timing gear.
(front of engine). B. Timing Belt.
C. Main bearing.
D. Rod bearing.
9. Noise in crankshaft area A. Crankshaft striking pan or pan baffle.
(center of engine). B. Main bearing.
C. Rod bearing.
10. Noise in crankshaft area A. Loose flywheel.
(rear of engine). B. Drive plate.
C. Main bearing.
D. Rod bearing.
11. Engine spark knock. A. Advanced timing.
B. Low quality fuel.
C. Engine running hot.
D. Carbon deposits in engine.
12. Popping through A. Wrong ignition timing.
carburetor. B. Carburetor set too lean.
C. Faulty accelerator pump (gasoline).
D. Vacuum leak.
E. Valve adjustment.
F. Valve timing.
G. Burned or stuck valve.
13. Hissing. A. Vacuum leak.
B. Leaking exhaust (manifolds or pipes).
C. Loose cylinder heads.
D. Blown head gasket.
14. Whistle. A. Vacuum leak.
B. Dry or tight bearing in an accessory.
15. Sparks jumping. A. Defective high-tension cables.
B. Cracked coil tower.
C. Cracked distributor cap.
16. Squeaks or squeals. A. Drive belt slipping.
B. Dry or tight bearing in an accessory.
C. Parts rubbing together.
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