80 ENGINE TROUBLESHOOTING
7/26E, 7/31E, 7/41
Low engine output
Incorrect injection pump
adjustment
Incorrect injection timing
Too far advanced.
Too far retarded.
Injection nozzle malfunction
Incorrect injection pressure.
Incorrect spray condition.
Insufficient fuel supply to the
injection pump
Lack of fuel in tank.
Air in injection pump.
Fuel filter clogged.
Overflow valve malfunction.
Governor malfunction
Incorrect engine control
adjustment.
Deteriorated governor spring.
Low cylinder compression
pressure
Cylinder compression leakage
Incorrect valve clearance
adjustment.
Injector nozzle misalignment.
Cylinder bore wear.
Insufficient air intake volume.
Air cleaner clogged.
Restricted air flow.
Excessive oil consumption
Incorrect oil
Wrong selection of type and viscosity.
Too much oil quantity.
Engine burning oil
Faulty piston rings/damaged cylinder bores.
Faulty valve stem seal.
Oil leakage
Damaged seal / Damaged turbocharger seal
Loose joints/gaskets.
Improper installation of filter and piping.
Excessive fuel consumption
Fuel leakage
Damaged seals.
Improper component installation or tightening.
Excessive injection volume. Injection pump defective.
Excessive mechanical loads
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