TM 5-4220-211-12&P
Table 4-4. ENGINE TROUBLESHOOTING (con't)
Symptom
Probable Cause
Correction
Engine Runs Unevenly;
Improper Injection
Check Fuel Pump
Low Output
Timing or Worn Injection Pump
Timing; Adjust or Repair as
Necessary
Poor Quality or
Replace Contents of
Improper Fuel
Tank with Fresh Diesel Fuel
Sticking Governor
Clean and Adjust Governor and
Change Lube Oil
Engine Races
Governor Damaged or
Adjust or Replace
Improperly Adjusted
Governor
Exhaust Emits Excessive
Smoke:
A. Blue Smoke
Engine Oil Level
Drain Off and Recheck
too High
Oil Level; Check to Make Sure
Engine is Not Tilted from its
Normal Angle of Operation
Poor Compression Due to Seized
Replace Broken Piston
or Broken Piston Rings, Worn
Ring, Valves or Guides
Valves or Guides
B. Black Smoke
Engine Overloaded
Reduce Engine Load
Primer Button Does Not
Reduce Load on Engine;
Disengage Since Engine
Move Throttle Lever
Does Not Reach
into Idling Position.
its Rated Speed
Then Slowly Back to Full Load
Engine Runs too Hot
Engine Compartment
Provide More Fresh Air
too Hot
Circulation to Engine Clean Air
Intake Screens and Cylinder
Shields
Oil Level Too High
Drain Excess Engine
Oil; Check Engine Angle
Injection Nozzle Defective
Replace Nozzle
Feed Rate of Injection Pump Erratic
Adjust or Repair Injection Pump
Excessive Oil Consumption
High Oil Temperature
Reduce Single Load; Provide
More Cooling Air
Breather Inoperative
Clean or Replace Breather
Oil too Thin
Replace with Oil of Proper
Viscosity for Climate Conditions
4-14
