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Page Title:
Engine runs rough, one or more cylinders not fiiing |
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 Corrective Action
Probable Cause
Malfunction
f. Time fuel injection pump (para 4-4). Also
f. Fuel injection pump not properly
refer to TM 9-2910-212-34.
timed. (Initial engine starting. )
g. Remove fuel injection pump (para 4-4).
g. Failed fuel injection pump.
Install new fuel injection pump (para 4-4).
h. Disassemble engine (chapter 5 ) and replace
h. Fuel injection pump fails to turn
defective parts. Assemble engine (chapter
when engine is cranking or turned
7).
by hand.
i. Check valve clearance (para 4-23) and make
i. Low cylinder compression.
cylinder compression check (para 4-22 ) and
take appropriate corrective action as noted
below:
1. Worn piston rings
Remove cylinders (para 5-1 2) and replace
worn piston rings (para 6-23 through 6-
27). Install pistons and cylinders (para 7-
8a).
2. Leaking valves
Remove cylinders ( para 5-1 2) and repair
leaking valves (para 6-33a). Install pistons
and cylinders (para 7-8a).
a. C h e c k oil cooler thermostat (para 6-
a. Engine operating at below normal
3. Engine runs rough, one or
47d(2)). Operate engine at higher rpm.
temperature.
more cylinders not fiiing:
b. Check fuel filters for water, dirt, and ob
b. Water in fuel, dirty fuel, or
s t r u c t i o n s . Refer to pertinent vehicle
restricted fuel filters.
Technical Manual, Appendix A. If clean,
replace fuel pump (para 4-4).
c. Tighten or remove leaking fuel injector
c. Leaking or failed fuel injector
tubes (Table 5-5). Install fuel injector tubes
tubes.
d. Check and reset valve clearance (para 4-
d. Improper valve adjustment.
23).
e. Check and clean fuel filter elements. Refer
e. Fuel injector nozzles dribbling or
to pertinent vehicle Technical Manual,
not functioning properly.
and overhaul nozzle and holder assembly
f. Remove fuel injection pump (Table 4-1).
f. Fuel injection pump not func-
Install fuel injection pump (Table 4-1).
tioning properly.
Inspect fuel filters for dirt and service if
necessary. Refer to b, above.
g. Refer to item 2j, above, for corrective ac-
g. Low compression on one or more
tion.
cylinders.
a. Drain fuel tanks and fill with proper
a . Improper fuel being used or
4. Engine low on power, stall
specification fuel. Refer to pertinent vehicle
inadequate fuel delivery to engine.
speed below normal of 1850
Technical Manual, Appendix A for proper
to 1950 rpm:
fuel. Refer to fuel system troubleshooting,
b. Restricted fuel filters or lines.
b. Clean filters and fuel lines and remove
restrictions. Refer to pertinent vehicle
Technical Manual, Appendix A.
c. Replace fuel pump assembly (para 4-4).
c. Faulty fuel pump assembly.
d. Refer to cooling system troubleshooting,
d. Engine overheated.
3-3
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