TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 73 of 779
Malfunction
3. Engine runs rough, one or
more cylinders not fiiing:
4. Engine low on power, stall
speed below normal of 1850
to 1950 rpm:
Probable Cause
f. Fuel injection pump not properly
timed. (Initial engine starting. )
g. Failed fuel injection pump.
h. Fuel injection pump fails to turn
when engine is cranking or turned
by hand.
i. Low cylinder compression.
a.
b.
c.
d.
e.
f.
g.
Engine operating at below normal
temperature.
Water in fuel, dirty fuel, or
restricted fuel filters.
Leaking or failed fuel injector
tubes.
Improper valve adjustment.
Fuel injector nozzles dribbling or
not functioning properly.
Fuel injection pump not func-
tioning properly.
Low compression on one or more
cylinders.
a. Improper fuel being used or
inadequate fuel delivery to engine.
b. Restricted fuel filters or lines.
c. Faulty fuel pump assembly.
d. Engine overheated.
Corrective Action
f. Time fuel injection pump (para 4-4). Also
refer to TM 9-2910-212-34.
g. Remove fuel injection pump (para 4-4).
Install new fuel injection pump (para 4-4).
h. Disassemble engine (chapter 5 ) and replace
defective parts. Assemble engine (chapter
7).
i. Check valve clearance (para 4-23) and make
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.
b.
c.
d.
e.
f.
g.
Check oil cooler thermostat (para 6-
47d(2)). Operate engine at higher rpm.
Check fuel filters for water, dirt, and ob
structions. Refer to pertinent vehicle
Technical Manual, Appendix A. If clean,
replace fuel pump (para 4-4).
Tighten or remove leaking fuel injector
tubes (Table 5-5). Install fuel injector tubes
(Table 5-5).
Check and reset valve clearance (para 4-
23).
Check and clean fuel filter elements. Refer
to pertinent vehicle Technical Manual,
Appendix A. Remove fuel injector nozzle
and overhaul nozzle and holder assembly
(Table 4-7).
Remove fuel injection pump (Table 4-1).
Install fuel injection pump (Table 4-1).
Inspect fuel filters for dirt and service if
necessary. Refer to b, above.
Refer to item 2j, above, for corrective ac-
tion.
a. Drain fuel tanks and fill with proper
specification fuel. Refer to pertinent vehicle
Technical Manual, Appendix A for proper
fuel. Refer to fuel system troubleshooting,
paragraph 3-8.
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).
d. Refer to cooling system troubleshooting,
paragraph 3-10.
3-3
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