| Difficult to start during hot or cold start |
- Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
- Head gasket damaged.
- Fuel system damaged or inoperative.
- Ignition system inoperative.
|
|
| Poor idling |
- Restricted exhaust system.
- Vacuum leak.
- Burned valve(s).
- Incorrect valve to valve seat contact.
- Head gasket damaged.
- Fuel system damaged or inoperative.
- Damaged cooling system.
|
|
| Insufficient power |
- Compression leakage from valve seat.
- Valve sticking.
- Valve spring weak or broken.
- Head gasket damaged.
- Cylinder head cracked or distorted.
- Piston ring(s) worn, damaged or sticking.
- Fuel system damaged or inoperative.
- Brakes dragging.
- Restricted exhaust system.
|
- INSPECT the valve or valve seat.
- INSPECT valve stem to valve guide clearance or carbon accumulation.
- INSPECT the valve spring.
- INSPECT the head gasket.
- INSPECT the cylinder head.
- INSTALL a new short block.
- See
FUEL SYSTEM
.
- See
SYMPTOM TROUBLESHOOTING CHART
.
- INSPECT the exhaust system.
|
| Excessive or insufficient compression |
- Valve(s) burnt or sticking.
- Valve spring(s) weak or broken.
- Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
- Head gasket damaged.
- Carbon accumulation in combustion chamber.
- Fuel system damaged or inoperative.
|
- INSPECT the valve(s).
- INSPECT the valve spring(s).
- INSTALL a new short block.
- INSPECT the head gasket.
- ELIMINATE carbon build up.
- See
FUEL SYSTEM
.
|
| Excessive oil consumption |
- Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
- Valve stem seal worn or missing.
- Oil leakage.
- Valve stem or valve guide worn.
- Incorrect oil viscosity.
- Diluted oil.
- Crankcase overfilled.
- Incorrect oil pressure.
|
- INSTALL a new short block.
- INSPECT the valve or valve stem seal.
- REPAIR oil leakage.
- INSPECT the valve stem or valve guide.
- DRAIN and FILL with new oil.
- CHECK oil dilution. DRAIN and FILL as necessary.
- CHECK and adjust the oil level.
- CHECK the oil pressure. REPAIR as necessary.
|
| Engine noise |
- Excessive crankshaft main bearing clearance.
- Excessive crankshaft end play.
- Excessive connecting rod bearing oil clearance.
- Piston/cylinder worn.
- Piston ring damaged.
- Connecting rod bent.
- Valve spring(s) broken.
- Excessive valve guide clearance.
- Cooling system inoperative (water pump, vibration of radiator).
- Fuel system inoperative.
- Excessive carbon buildup.
- Exhaust gas leakage.
- Incorrect drive belt tension.
- Generator front bearing worn.
|
|
| Tappet noise, engine running |
- Incorrect tappet clearance.
|
- CHECK and ADJUST the tappet clearance as necessary.
|