A Series Diesel Engine Troubleshooting Logic 22
Engine Runs Rough Or Misfiring
Cause Correction
Fuel Injection Lines Leaking
Inspect/Correct Leaks in the High
Pressure Lines, Fittings Injector Sealing
Washers, or Delivery Valve. Refer to Page
78
OK
Air in the Fuel or the Fuel Supply is
Inadequate
Check the Flow Through the Filter and
Bleed the System. Locate and Correct the
Air Source. Refer to Page 83
OK
Contaminated Fuel
Verify by Operating the Engine with Clean
Fuel from a Temporary Tank.
OK
Incorrect Valve Adjustment
Check for a Bent Push Rod and Adjust
Valves. Refer to Page 179
OK
Injection Pump Timing Incorrect
Check/Time Pump.
Refer to Page 77
OK
One or More Cylinders Has Low
Compression
Perform a Compression Check to Isolate
the Cause of Low Compression (Piston
Rings, Head Gasket or Valves). Refer to
Page 158
OK
(Continued)
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