TM 5-4220-211-12&P
TROUBLESHOOTING (Continued)
FAULT
POSSIBLE CAUSE
REMEDY
Engine Races
Governor Damaged or
Adjust or Replace Governor
Improperly Adjusted
Exhaust Emits
Excessive Smoke:
A. Blue Smoke
Engine Oil Level Too High
Drain Off and Recheck Oil Level, Check to Make Sure
Engine is Not Tilted from Its Normal Angle of Operation
Poor Compression Due to
Seized or Broken Piston
Rings, Worn Valves or
Guides
B. Black Smoke
Engine Overloaded
Reduce Engine Load
Primer Button Does Not
Reduce Load on Engine; Move Throttle Lever Into
Disengage
Since
Engine
Idling Position, Then Slowly Back to Full Load
Does
Not Reach Its Rated Speed
Engine Runs Too Hot
Engine Compartment Too Hot
Provide More Fresh Air 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
Adjust or Repair Injection Pump
Pump Erratic
Excessive Oil
High Oil Temperature
Reduce Single Load, Provide More Cooling Air
Consumption
Breather Inoperative
Clean or Replace Breather
Oil Too Thin
Replace with Oil of Proper Viscosity for Climate
Conditions
Piston Rings Worn or
Inspect and Free Rings or Overhaul Engine
Sticking; Cylinder Wall(s)
Scuffed or Scratched
Oil Leaking
Inspect and Tighten Fittings as Needed
Unusual Engine
Loosen Mounting Bolts
Inspect and Tighten Any Loose Bolts
Knocks and Noises
Engine Overloaded
Reduce Engine Load
Loose Flywheel
Tighten Flywheel Mtg. Bolts
Damaged Gear Teeth
Replace Any Gear with Broken Teeth, Also Examine
Gear It Engages for Damage
Incorrect Timing
Correct Injection Pump Timing
A-4
