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 49. TROUBLESHOOTING ENGINE ASSEMBLY - Continued
Probable causes
Malfunction
Corrective action
Engine exhaust
e.
Low engine temperature
e.
Check available fuel
7.
supply for contamination.
or operating with less
smokes - Continued
Remove thermostat
desirable fuel.
stat (par. 218). Replace
when damaged and in-
stall (par. 76). " Refer
to cooling system
troubleshooting (par. 55)
for other probable causes
and corrective action.
f.
Fuel injector nozzle and
f.
Remove and repair fuel
--
holder assemblies defec-
injector nozzle and
tive, dripping, leaking,
holder assemblies (par.
or poor spray pattern.
83). Replace when nec-
essary.
Fuel injection pump not
Check and adjust fuel in-
g.
g.
properly timed while
jection pump timing (par.
operating at 3/4 or full
106).
load condition.
Engine noises.
8.
Worn cylinder liner and
a.
a.
Disassemble engine
(1) Knocking
piston.
noise.
Replace worn cylinder
liners (par. 162) and
replace pistons, pins,
and piston rings. As-
semble engine (pars. 253
through 286).
Loose piston pin or pins.
Disassemble engine
b.
b.
Disassemble connecting
Note. Locate noise by
rod and piston (par. 173).
disconnecting fuel in-
jection tubes, one at a
Replace connecting rod
time, at fuel injector
piston pin bushing-type
nozzle and holder until
bearing (par. 175). As-
noise is located. When
semble connecting rod
knocking noise changes
and piston with new pis -
when tube is disconnected,
ton pin (par. 176). As-
worn or defective con-
semble engine (pars.
necting rod bearing, main
bearing, piston, or piston
pin may be the probable
cause.
42
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