69
ENGINE TROUBLESHOOTING
7/20, P65
Unstable engine running
Crack in injection pipe.
Injection nozzle failure.
Unstable low idling
Engine stop solenoid return failure.
Uneven compression pressure between cylinders.
Incorrect high idle speed
adjustment.
Incorrect control lever adjustment.
Governor internal malfunction.
Engine hunting in medium speed
range.
Governor spring deteriorated.
Air in the fuel system
Insufficient fuel supply.
Clogged fuel filter element
Piping failure (squeezed/restricted
etc.)
Engine malfunction in high speed
range.
Uneven fuel injection amount between cylinders.
Deteriorated governor spring.
Incorrect valve clearance adjustment.
Deteriorated valve spring.
Engine speed stuck at high idle.
Engine control restriction or seizure.
Engine overheat.
Insufficient coolant volume.
Fan belt slippage.
Cooling system defect
Thermostat malfunction.
Radiator filler cap malfunction.
Cooling system interior fouled.
Radiator clogged.
Engine over
−
loaded.
Improper servicing
Air cleaner element clogged.
Insufficient airflow/restriction.
Restricted coolant flow (high concentration of antifreeze, etc.)
Low oil pressure
Lack of oil
Oil leakage
High oil consumption
Wrong oil
Wrong type and viscosity.
High coolant temperature.
Over heat.
Clogged filter and strainer.
Worn bearings and oil pump.
Faulty relief valve.
