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 Corrective Action
Probable Cause
Malfunction
b. Defective fuel injector nozzle
b. Replace fuel injector nozzle gaskets (para 7-
gaskets.
11a). Refer to item 7c, above, for other
corrective action.
c. Service fuel filters and drain fuel tanks.
c. Water in fuel.
Refer to 4a, above.
d. Low compression.
d. Check cylinder compression, refer to 2j,
above. Replace defective parts.
a. Refer to 3, above, for corrective action.
a. One or more cylinders not firing.
(b) Blue smoke indicating
(Replace engine.)
presence of engine oil in
b. Remove cylinders and pistons and replace
b. Worn or stuck piston rings or
rings and worn parts. Refer to 2h, above.
worn cylinder.
c. Remove cylinder and replace valve guides.
c. Worn valve guides.
d. Remove turbosupercharger (Table 5-1).
d. Worn turboeupercharger oil seals.
Overhaul turbosupercharger refer to TM 9-
2990-200-34 for procedures. Install tur-
bosupercharger (para 7-17b).
a. Refer to para 3-7.
a. Restriction in air supply system.
(c) Black smoke indicating
b. Remove turbosupercharger (Table 5-1).
b. F a i l e d turbosupercharger (ex-
a rich fuel mixture.
Overhaul turbosupercharger refer to TM 9-
Note: Black smoke
cessive smoke for afflicted engine
2990-200-34 for procedures. Install tur-
bank).
during acceleration is
bosupercharger (para 7-17b).
normal.
c. Overhaul fuel injector nozzle and holder
c. Fuel injector nozzles not func-
assemblies. Refer to 7c, above, for corrective
tioning, dripping, or retaining
action. Replace springs.
d. Check fuel. Refer to 4a, above.
d. Operating with improper fuel.
e. Adiust fuel iniection pump. Refer to TM 9-
e. Fuel injection pump improperly
2910-212-34 for adjustment procedures.
adjusted.
f. Time fuel injection pump (para 4-4). Also
f. Fuel injection pump not properly
refer to TM 9-2910-212-34.
timed.
g. Refer to 41, above, for corrective action.
g. Fuel injection pump advance unit
not functioning properly.
a. Remove cylinders and pistons (table 5-9).
a. Loose piston pin or pins or broken
9. Engine noise.
Rebuild pistons, rings, and pins (table 6-
piston rings.
(a) Abnormal k n o c k i n g
12). Install pistons and cylinders (table 7-
noise.
4).
b. Disassemble engine (chapter 5). Rebuild
b. Worn engine bearings.
crankshaft, connecting rod assemblies, and
bearings (table 6-8). Assemble engine
(chapter 7).
c. Remove cylinder and piston (table 5-9).
c. Scored piston or cylinder.
Overhaul cylinder (table 6-14). Install
piston and cylinder (table 7-4).
a. Adjust valve clearances ( para 4-23).
a. Excessive valve clearances.
(b) Tapping noise.
b. Remove valve rocker arm covers. (Refer to
b. Worn or damaged valve rocker
arm
Replace valve rocker arm assemblies.
Assemble rocker arm covers. Install valve
rocker arm covers.
a. Replace damaged engine accessories.
a. Accessories damaged.
(c) Grinding or squeaking
1. Fuel injection pump.
1. Remove fuel injection pump (table 4-1).
noise.
Refer to TM 9-2910-212-34 and overhaul
fuel injection pump. Install injection pump
2. Remove generator (table 4-1). Refer to
2. Generator.
TM 9-2920-224-35 and overhaul
generator. Install generator (table 4-1).
3-5
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