Mechanical Diagnosis
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Engine stops after starting Air in injection pump Bleed fuel system
Fuel filter obstructed Replace filter element
High water temperature (coolant) Add coolant. Check for leaks
Low oil pressure Add oil. Check for leaks
Vent of fuel tank obstructed Remove obstruction
Electric fuel pump not operating Check pump for running and 8 to
10 psig (55 to 69 kPa). Repair or
replace fuel pump
Dry air cleaner plugged Change filter element
Fuel solenoid not energized Check run circuit
High refrigerant pressure Locate and correct cause
Engine does not reach full power Air or dirt in fuel system Adjust
Fuel line leaks Tighten connections of fuel lines. If
necessary, replace damaged lines
Speed adjustment wrong Adjust speed
Electric fuel pump does not run Check voltage. Repair or replace
pump
Fuel filter blocked Install new filter
Electric fuel pump filter dirty Clean and replace diesel filter
Delivery of fuel pump insufficient Repair or replace pump
Cylinder head gasket leaking Replace gasket
Piston rings worn, stuck or broken Replace rings
Cylinder worn Replace or bore
Leaking injection nozzle or irregular
injection caused by fouling
Clean and repair nozzle
Insufficient compression pressure
due to faulty piston or valves
Check cylinder with compression
tester. If necessary, grind valves or
replace piston
Air filter clogged Clean air filter
Fuel tank vent clogged Unclog vent
Injection rate too low Adjust pump discharge rate
Insufficient injection pressure Readjust or replace nozzle
Pump injects too early or too late Adjust injection pump timing
Air in fuel system Bleed fuel system
Air is drawn into fuel pump Check all fuel lines and fittings
Loose governor assembly Check and repair governor
assembly
Restricted exhaust system Clean or replace restricted parts
Condition Possible Cause Remedy
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