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 74 of 779
5. Excess engine power:
6. Engine overspeeds beyond
2640 rpm at on load:
7. Engine will not idle, but
runs well under load.
8. Engine smokes:
(a) White or grey smoke
indicating unburned fuel.
3-4
Probable Cause
e. Improper fuel injection pump
operating lever travel or engine
linkage adjustment.
f. One or more cylinders not firing.
g.
h.
j.
k.
Fuel injector nozzles not func-
tioning properly.
Fuel injection pump not properly
timed.
Low cylinder compression. (Worn
piston rings or burned valves.)
Failed turbosupercharger. (in
checking
for
a
failed
tur-
bosupercharger, a quick check
should be made to see that tur-
bosupercharger vanes turn freely.
Vanes which have excessive drag
will have low output.)
Leaking engine exhauet system
causing
reduced pressure to
turbosuperchargers.
l. Fuel injection pump advance unit
not functioning properly.
a. Cooling fans not operating.
b. Improper fuel injection pump high
idle screw or bridge setting.
c. Improper fuel injection pump
timing.
Fuel injection pump governor not
properly adjusted.
a.
b.
c.
d.
e.
Some cylinders not firing (low
ambient temperatures).
Improper adjustment of engine
idle screw or linkage sticking.
Fuel injector nozzles not func-
tioning properly.
Fuel injection pump governor not
properly adjusted.
Fuel injection pump not func-
tioning properly.
a. Engine cylinders and intake air
too cold for efficient combustion.
Corrective Action
e. Adjust fuel injection pump linkage to get
complete travel. Refer to TM 9-2910-212-
34 for procedures on adjusting pump and
figures 4-84 and 4-85 for adjustment of
linkage.
f. Refer to item 3, above, for corrective action.
g. Time fuel injection pump (para 4-4). Also
refer to TM 9-2910-212-34.
h. Check valve clearance (para 4-23). Check
j.
k.
l.
cylinder compression (para 4-22) and take
appropriate corrective action tabulated in
item 2h, above.
Remove turbosupercharger (Table 5-1).
Overhaul turbosupercharger, refer to TM 9-
2990-200-34. Install serviceable tur-
bosupercharger (para 7-17b).
Repair exhaust system. Refer to pertinent
vehicle Technical Manual, Appendix A.
Remove engine exhaust manifold (table 5-
5). Repair
exhaust manifolds. Install
exhaust manifolds (table 7-9).
Remove rear fan and accessory drive
housing assembly (table 5-8). Rebuild fuel
injection pump advance unit (table 6-29).
Install rear fan and accessory drive housing
assembly (table 7-5).
a. Refer to paragraph 3-10 for corrective
action.
b. Adjust fuel injection pump high idle screw.
Refer to TM 9-2910-212-34 for procedures.
c. Time fuel injection pump (para 4-4). Also
refer to TM 9-2910-212-34.
Adjust fuel injection pump governor. Refer to
TM 9-2910-212-34 for procedures.
a. Operate engine at part load to increase
cylinder head temperature or use intake
manifold heater.
b. Reset idle screw and check for sticking
linkage.
c. Remove fuel injector nozzles. Refer to table
4-7 for references on removing, repairing,
checking, and installing nozzle and holder
assembly.
d. Adjust fuel injection pump governor. Refer
to TM 9-2910-212-34 for procedures.
e. Remove fuel injection pump (table 4-1).
Overhaul fuel injection pump. Refer to TM
9-2910-212-34 for instructions. Install
injection pum
P
(table 4-1).
a. Operate engine under load to increase
cylinder head temperatures. Increase idle
speed, use manifold heater.
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