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 49. TROUBLESHOOTING ENGINE ASSEMBLY - Continued
Corrective action
Probable causes
Malfunction
--.
d
Loosen fuel injection
Defective fuel injector
d.
Engine runs rough,
3.
tube to nozzle and
nozzle and holder assem-
one or more cyl-
holder assembly, one
bly.
inders not firing -
at a time, and note
Continued.
which one, when dis -
connected, does not
affect engine roughness
or engine speed. This
check indicates defec-
tive nozzle. Repair or
replace nozzle and
holder assembly (par.
e.
Make cylinder com-
Low compression on
e.
pression check (par.
one or more cylinders.
priate action to cor-
rect condition as fol-
lows :
(1) Worn piston rings.
Rebuild engine
(pars. 111 through
286).
(2) Leaking valves.
Remove cylinder
head and install new
cylinder head and
valve assembly
f.
Remove cylinder head
Leaking or blown cylinder
f.
head gasket.
new gasket.
Check and reset valve
Improper valve adjustment.
g.
g.
clearances (par. 104).
h.
Replace defective valve
h.
Bent or broken push rod,
rocker arm push rod
worn camshaft lobe, or
(par. 93). Disassemble
broken valve tappet.
engine (par. 111) as
Cracked or damaged
necessary to replace
piston.
worn camshaft, damaged
piston, or damaged
valve tappet.
a.
Refer to paragraph 49,
a.
One or more cylinders
4. Engine low on
3 above for corrective
not firing.
power.
action.
38
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