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 49. TROUBLESHOOTING ENGINE ASSEMBLY - Continued
Malfunction
Probable causes
Corrective action
--.
b
Fuel injection pump governor
10. Engine surges at
--.
b
Adjust fuel injection pump
all speeds -
not properly adjusted.
governor. Refer to TM
9-2320-235-20 and TM
Continued.
9-2910-223-35. Replace
pump when necessary
--.
a
Remove thermostat (par.
11. Poor fuel economy.
Operating engine at low
--.
a
cylinder temperature.
76). Test thermostat
Coolant temperature
below
necessary and install
Refer to paragraph 49
b.
Loss of power or low
--.
b
--
above and administer
power.
corrective action for low
on power.
c.
Check available fuel
c. Operating with less de-
sirable fuel.
supply.
d.
Clutch worn or defec-
--.
d
Refer to TM 9-2320-
235-35 for procedures to
tive.
remove clutch when engine
is installed in vehicle.
Refer to paragraph 67 for
clutch removal when
engine has been removed
from vehicle. Overhaul
clutch (pars. 248 through
252) when necessary.
Troubleshoot the fuel
--.
a
a.
12. Engine stops
Defective fuel supply
supply system (par. 53).
suddenly.
system.
b.
Refer to TM 9-2990-201-
b.
Restriction in air in-
35 and inspect for ob-
take system.
structions in induction
system. Collapsed air
intake hoses and/or
clogged air cleaner. Re-
fer to TM 9-2320-235-20.
c.
Replace fuel injection
--.
c
Defective fuel injection
pump or fuel supply
pump (par. 63). Refer to
pump.
TM 9-2910-223-35 for
replacement procedures
for fuel supply pump.
47
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