Mechanical Diagnosis
161
Engine is sooting heavily, emits
thick black clouds of smoke
(excessive fuel to air ratio)
Wrong fuel Drain and refill with correct fuel
Clogged air intake system Clean air cleaner
Restricted exhaust system Clean or replace
Opening pressure of nozzle is
too low or needle sticks
Repair nozzle. Replace if necessary
Injection amount too great Have pump repaired
Oil being drawn in Check oil level in oil bath air filter
Injection pump timing Check timing of injection pump
Excessive load Check drive system and engine oil
pressure
Engine knocks Insufficient air Clean air filter
Air in fuel system Bleed fuel system
Engine is cold Warm up
Fuel return line plugged Remove restriction
Injection pump not timed Retime injection pump
Injection nozzle fouled or opening
pressure too low
Clean, repair or replace injection
nozzle
Dirty radiator Clean radiator
Worn engine parts Overhaul engine
Engine runs hot Engine coolant is low Add coolant slowly while engine is in
operation
Dirty or plugged radiator Clean radiator
Cooling system heavily scaled Clean cooling system
Water pump leaks Repair or replace water pump
Worn or loose belt Replace belt or adjust
Cylinder head gasket leaks (bubbles
appear in radiator if cylinder gasket
is leaking)
Replace cylinder head gasket.
Correct gasket
Faulty thermostat Check or replace the thermostat
Faulty temperature sensor Replace sensor
Oil pressure too low or drops
suddenly
Insufficient oil in pan Refill oil base after correcting cause
of loss
Leak in oil line Tighten oil line fittings
Oil relief valve sticking Disassemble and clean oil pressure
regulator valve
Faulty oil pressure switch Replace if necessary
Worn oil pump, camshaft, main or
connecting rod bearings, loose oil
gallery plug, oil in water through
crack
Repair engine
Condition Possible Cause Remedy
To Next Page
Loading...
Need help?
General
