TM 5-3820-233-35/2
Probable cause
Possible remedy
9. Erratic Engine Operation
Cylinder heal gasket
Replace gasket (para 43).
Probable cause Possible remedy
leaking.
Faulty injectors ........ Check the injector timing
Improper valve clearance
Check exhaust valve
and position on in-
clearance and adjust
jector racks (Operator's
to the correct clearance
Manual).
(Operator's Manual).
Low compression pres
Replace piston and piston
Blower inoperative
Inspect blower drive shaft
sure
rings (para 46).
and coupling, and re-
Replace cylinder head
place parts if necessary
gasket (para 43).
Replace valve seats (para
Insufficient fuel
Clean injector spray tip
orifices (para 41).
Replace injector tubes
Replace injector spray
tips (para 41).
Replace injector plunger
10. Engine Lacks Power
and bushing assembly
Probable cause Possible remedy
Piston assemblies worn
Replace piston assemblies
Time injector rack and
gear (Operator's Manu-
High engine temperature Repair defective water
al).
caused by defective pump (para 34).
Worn fuel pump gears
Replace gear and shaft
water pump.
or pump housing.
assembly in pump
Improper gear train Time gear train (para
timing.
51).
Fuel pump not rotating
Check blower drive, if
broken, replace neces-
11. Engine Will Not Turn
sary parts (para 37).
Probable cause
Possible remedy
Check fuel pump drive
Engine is Locked or seized Disassemble engine to
gear and shaft, if
determine the cause
broken, replace neces-
and replace necessary
sary parts (para 36)
parts.
Replace fuel pump
(Operator's Manual).
12. Low Cranking Speed
14. Low Oil Pressure
Probable cause
Possible remedy
Probable cause
Possible remedy
Starter brush springs
Check brush spring ten-
Poor circulation
Remove and clean oil
weak.
sion, replace springs if
cooler core (Operator's
necessary (para 30).
Manual).
Starter commutator dirty
Polish commutator, ma-
Replace oil cooler by-pass
or worn.
chine commutator and
valve (Operator's Man-
under-cut mica if neces-
ual).
sary (para 30).
Replace oil pressure reg-
Starter armature burned
Replace armature (para
ulator valve (Operator's
out.
30).
Manual).
Check if gallery, crank-
13. Engine Hard to Start
shaft or camshaft
Probable cause Possible Remedy
plugs are missing and
Exhaust valves sticking Check for bent valve
replace if parts are
or burned.
guide and replace if
missing.
necessary (para 43).
Faulty oil pump
Replace oil pump (para
Check for defective valve
spring and replace if
Dirty oil pump inlet
Clean screen (para 45)
necessary (para 43).
screen.
Clean and reface valve
15. Engine Overheats
Probable cause
Possible remedy
Compression rings worn Replace rings (para 46).
Improper engine lubri-
Check for proper opera-
or broken.
cation.
tion of engine oil pump
2-3
