TM 5-3805-281-24-1
Diagnostic Information
Symptom
Problem
Solution
Main or connecting rod bearing
Replace main bearings or
clearance excessive
connecting rod bearings. See Engine
Repair chapter.
Pistons or liners scored
Check, repair pistons or liners. See
Engine Repair chapter.
Piston rings worn, broken or stuck
Do Compression Pressure Test. See
Engine Repair chapter.
9010
15
9
Oil return slots in piston clogged
Clean. See Engine Repair chapter.
Crankshaft thrust bearing worn
Check piston and rod assembly. See
(misaligned piston and rod)
Engine Repair chapter.
Valve guides or valve stems worn
Check, repair. See Engine Repair
chapter.
Engine Uses Too Much Fuel
Fuel system leakage
Tighten connections. See Engine
Repair chapter.
Plugged or dirty air intake
Clean air intake system.
Wrong fuel
Use correct fuel.
Injection pump static timing
Check, injection pump static timing.
See Engine Repair chapter.
Injection nozzles
Test, repair nozzles. See Engine
Repair chapter.
Excessive Black Smoke
Wrong fuel
Use correct fuel.
Plugged or dirty air intake or exhaust
Clean air intake and exhaust system.
system.
Injection pump static timing
Check injection pump timing. See
Engine Repair chapter.
Over-fueling
Remove and adjust fuel injection
pump. See your Local Fuel Injection
Pump Service Center.
Continued on next page
CED,TX14795,4357
1917APR989/12
3-37
