Symptom Related Diagnostic Procedures

CONDITIONS:

Difficult to start during hot or cold start

Possible Source(s):
^ Piston ring(s) worn, damaged, sticking or worn piston/cylinder.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Head gasket damaged.

Action(s) to take:
^ INSPECT the head gasket.

Possible Source(s):
^ Fuel system damaged or inoperative.

Action(s) to take:
^ For additional information, refer to Fuel Charging and Controls.

Possible Source(s):
^ Ignition system inoperative.

Action(s) to take:
^ For additional information, refer to Engine Ignition.

Poor Idling

Possible Source(s):
^ Restricted exhaust system.

Action(s) to take:
^ INSPECT the exhaust system.

Possible Source(s):
^ Vacuum leak.

Action(s) to take:
^ CARRY out the Intake Manifold Vacuum Test.
Intake Manifold Vacuum Test

REPAIR and INSTALL new components as necessary.

Possible Source(s):
^ Burned valve(s).

Action(s) to take:
^ INSPECT the valve(s).

Possible Source(s):
^ Incorrect valve to valve seat contact.

Action(s) to take:
^ INSPECT the valve and valve seat.

Possible Source(s):
^ Head gasket damaged.

Action(s) to take:
^ INSPECT the head gasket.

Possible Source(s):
^ Fuel system damaged or inoperative.

Action(s) to take:
^ For additional information, refer to Fuel Charging and Controls.

Insufficient power

Possible Source(s):
^ Compression leakage from valve seat.

Action(s) to take:
^ INSPECT the valve or valve seat.

Possible Source(s):
^ Valve sticking.

Action(s) to take:
^ INSPECT valve stem to valve guide clearance or carbon accumulation.

Possible Source(s):
^ Valve spring weak or broken.

Action(s) to take:
^ INSPECT the valve spring.

Possible Source(s):
^ Head gasket damaged.

Action(s) to take:
^ INSPECT the head gasket.

Possible Source(s):
^ Cylinder head cracked or distorted.

Action(s) to take:
^ INSPECT the cylinder head.

Possible Source(s):
^ Piston ring(s) worn, damaged or sticking.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Fuel system damaged or inoperative.

Action(s) to take:
^ For additional information, refer to Fuel Charging and Controls.

Possible Source(s):
^ Brakes dragging.

Action(s) to take:
^ For additional information, refer to Brake System.

Possible Source(s):
^ Restricted exhaust system.

Action(s) to take:
^ INSPECT the exhaust system.

Excessive or insufficient compression.

Possible Source(s):
^ Valve(s) burnt or sticking.

Action(s) to take:
^ INSPECT the valve(s).

Possible Source(s):
^ Valve spring(s) weak or broken.

Action(s) to take:
^ INSPECT the valve spring(s).

Possible Source(s):
^ Piston ring(s) worn, damaged, sticking or worn piston/cylinder.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Head gasket damaged.

Action(s) to take:
^ INSPECT the head gasket.

Possible Source(s):
^ Carbon accumulation in combustion chamber.

Action(s) to take:
^ ELIMINATE carbon build up.

Possible Source(s):
^ Fuel system damaged or inoperative.

Action(s) to take:
^ For additional information, refer to Fuel Charging and Controls.

Excessive off consumption

Possible Source(s):
^ Piston ring(s) worn, damaged, sticking or worn piston/cylinder.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Valve stem seal worn or missing.

Action(s) to take:
^ INSPECT the valve or valve stem seal.

Possible Source(s):
^ Oil leakage.

Action(s) to take:
^ REPAIR oil leakage.

Possible Source(s):
^ Valve stem or valve guide worn.

Action(s) to take:
^ INSPECT the valve stem or valve guide.

Possible Source(s):
^ Incorrect oil viscosity.

Action(s) to take:
^ DRAIN and FILL with new oil.

Possible Source(s):
^ Diluted oil.

Action(s) to take:
^ CHECK oil dilution. DRAIN and FILL as necessary.

Possible Source(s):
^ Crankcase overfilled.

Action(s) to take:
^ CHECK and adjust the oil level.

Possible Source(s):
^ Incorrect oil pressure.

Action(s) to take:
^ CHECK the oil pressure. REPAIR as necessary.

Engine noise

Possible Source(s):
^ Excessive crankshaft main bearing clearance.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Excessive crankshaft end play.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Excessive connecting rod bearing oil clearance.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Piston/cylinder worn.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Piston ring damaged.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Connecting rod bent.

Action(s) to take:
^ INSTALL a new engine.

Possible Source(s):
^ Valve spring(s) broken.

Action(s) to take:
^ INSPECT the valve spring(s).

Possible Source(s):
^ Excessive valve guide clearance.

Action(s) to take:
^ INSPECT the valve guide or valve.

Possible Source(s):
^ Cooling system inoperative (water pump, vibration of radiator),

Action(s) to take:
^ For additional information, refer to Engine Cooling.

Possible Source(s):
^ Fuel system inoperative.

Action(s) to take:
^ For additional information, refer to Fuel Charging and Controls.

Possible Source(s):
^ Excessive carbon buildup.

Action(s) to take:
^ ELIMINATE carbon buildup.

Possible Source(s):
^ Exhaust gas leakage.

Action(s) to take:
^ REPAIR leakage.

Possible Source(s):
^ Incorrect drive belt tension.

Action(s) to take:
^ INSPECT the drive belt tension. For additional information, refer to Accessory Drive.

Possible Source(s):
^ Generator front bearing worn.

Action(s) to take:
^ For additional information, refer to Generator and Regulator.

Tappet noise, engine running

Possible Source(s):
^ Incorrect tappet clearance.

Action(s) to take:
^ CHECK and ADJUST the tappet clearance as necessary.