The cold starting aid for the fuel injection pump does not
Inspect the cable connection and the electrical
connection of the cold starting aid. Test the cold
starting aid for correct operation.
The fuel shutoff solenoid is not operating correctly.
Make sure that the fuel shutoff solenoid operates
correctly. Replace a fuel shutoff solenoid that is
The fuel transfer pump is not operating correctly. The
fuel transfer pump was installed when the lobe of the
camshaft was at maximum lift.
Check the fuel pressure when the engine is cranking.
Remove the fuel transfer pump if the fuel pressure is too
low. The fuel transfer pump must be repaired or
Install the fuel transfer pump with the lobe of the
camshaft on minimum lift. Tighten the mounting bolts
The fuel filter or the fuel lines are restricted. Excess
water has built up in the fuel filter.
Check fuel lines and the fuel filter. Drain any water from
the fuel filter.
The operation of the fuel injection pump is not correct.
Check the timing of the fuel injection pump. Adjust the
timing or replace the fuel injection pump. Check the
timing of the drive gear for the fuel injection pump with
the idler gear. The fuel injection pump must be repaired
Make sure that the high pressure fuel lines are
connected to the fuel injector nozzles in the correct
Make sure that the mounting bolts of the fuel injection
pump are tightened to the correct torque. Inspect the
fuel lines for leaks or restrictions. The damaged fuel
lines or fittings must be repaired or replaced.
The linkage of the accelerator or governor is defective.
Tighten the retaining bolt If the accelerator lever on the
fuel injection pump is loose. Adjust the cable for the
accelerator lever if the accelerator lever moves to the
stops. The linkage for the governor must be repair or
A fuel injector nozzle is not operating correctly.
Run the engine at the rpm that gives maximum misfiring
or rough running. Then, loosen a fuel line nut on the
injection line for each cylinder. Loosen one nut at a
time. Then, tighten that nut before loosening the next
fuel line nut. If loosening the fuel line nut does not affect
the operation of the engine, the fuel injector nozzle is
probably defective. Test the fuel injector nozzle for that
cylinder. Replace the defective fuel injector nozzle.
Make sure that all of the fuel injector nozzles are the
correct type for the engine. Test the pressure setting of
the fuel injector nozzles.
Make sure that the fuel injector nozzles are properly
sealed in the threaded ports. Make sure that the fuel
injector nozzles are correctly aligned in the threaded
ports and tightened to the correct torque. Ensure that
seat washers are installed on the fuel injector nozzles
correctly. Make sure that the bottoms of the threaded
ports are clean and free of debris. Make sure that the
bottoms of the threaded ports do not contain extra seat
The air inlet heater is defective.
Test the air inlet heater. Replace the air inlet heater if
the air inlet heater fails the test.
The cylinders have low compression.
Starting the engine may be difficult in warm weather.
The engine may not start in cold weather. Low
compression is most frequently caused by the following
Cylinder liners are worn.
Piston rings are worn.
The fuel injector nozzles are not seated correctly.
The valve lash requires adjustment.
The fuel injection pump timing is incorrect.
The engine timing is incorrect.
When an inlet valve or an exhaust valve is fully seated,
gases leak past the valve head.