A Series Diesel Engine Troubleshooting Logic 20
Rough Idle (Irregularly Firing Or Engine Shaking)
Cause Correction
Cold Engine
Refer to Troubleshooting Logic for Engine
Running Too Cold. Refer to 35
OK
Idle Speed Too Low for the
Accessories
Check/Adjust Low Idle Screw.
Refer to Page 73
OK
Engine Mounts Over-Tightened,
Damaged or Loose
Verify Condition of Mounts. Refer to
Equip. Manufactures Service Instructions.
OK
High Pressure Fuel Leak
Inspect/Correct Leaks in the High
Pressure Lines, Fittings Injection Sealing
Washers or Delivery Valve Seals. Refer to
Page 78
OK
Air in the Fuel System
Bleed the Fuel System and Correct the
Source of the Air. Refer to Page 83
OK
Sticking Needle Valve in an Injector
Replace the Injector.
Refer to Page 88
OK
Malfunctioning Delivery Valve
Replace Delivery Valves.
Refer to Page 92
OK
(Continued)
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