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 49. TROUBLESHOOTING ENGINE ASSEMBLY - Continued
Malfunction
Corrective action
Probable causes
8.
Engine noises -
b.
Excessively worn crank-
b.
Replace all gears (par.
shaft or camshaft gears
Continued.
and/or fuel injection
pump driven gear.
--.
c
Failed engine bearings
c.
Crank engine by hand. If
caused by no oil pres-
squealing noise persists,
sure.
disassemble engine (pars.
place crankshaft main
bearing, connecting rod
bearings, and necessary
parts. Rebuild oil pump
assembly (par. 193).
Check cause of low or no
oil pressure. Assemble
engine (pars. 253 through
286).
9.
Rough or poor
a.
Fuel injection pump out
a.
Adjust fuel injection pump
of adjustment.
idle (par. 107). Refer to
engine idling.
TM 9-2910-223-35 for
other procedures on fuel
injection pump adjust-
ments that require partial
disassembly of pump.
b.
Defective fuel injector
b.
Remove fuel injector
nozzle and holder as-
nozzle and holder assem-
semblies caused by long
bly (par. 83b). Repair
engine idle periods.
(par. 83c through i ). In-
stall fuel injector nozzle
and holder assemblies
(par. 83j).
c.
Fuel injection pump out
c.
Check and adjust fuel in-
of time.
jection pump timing (par.
Air leak in intake manifold
Inspect intake manifold
d.
d.
for leaks. Replace de-
or gaskets.
fective manifold or gas-
kets (par. 89).
a.
Inspect for worn throttle
a.
Throttle linkage sticking
10. Engine surges at
linkage. Clean and re-
or binding.
all speeds.
pair linkage as directed
in TM 9-2320-235-35.
46
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