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 79 of 779
Malfunction
4. Excessive exhaust smoke.
3-9. Troubleshooting Lubricating Syste m
1. Low engine oil pressure.
2. High engine oil pressure.
Probable Cause
e. Improperly adjusted fuel injection
pump.
f. Fuel bleeder valve in injection
pump not functioning properly.
a .
b.
c.
d.
e.
Fuel injection pump improperly
adjusted causing excessive fuel
delivery.
Fuel injector nozzle and holder
assemblies
no t
functioning
properly. Nozzles dripping or
nozzle holder spring broken.
Turbosupercharger failed o r
restricted induction system.
Fuel injection pump not properly
timed.
Worn or scored pistons, cylinder,
or rings.
a.
b.
c.
d.
e.
Improper grade oil for prevailing
temperature.
Engine idle speed too low.
Insufficient oil in oil pan.
Engine oil pressure sending unit
not functioning properly.
High engine oil temperature or
diluted oil.
f. Oil pressure regulator valve not
operating properly.
g. Oil filters partially obstructed.
h. Crankcase oil passages obstructed.
j. Oil pump pickup tube screen
obstructed.
k. Oil pum p
not functionin g
properly.
l. Engine bearings worn.
a.
b.
Oil pressure sending
functioning properly.
Oil pressure regulator
functioning properly.
unit no t
valve not
Corrective Action
e. Adjust fuel injection pump. Refer to TM 9-
2910-212-34 for procedures.
f. Remove fuel injection pump (table 4-1).
Refer to TM 9-2910-212-34 for overhaul
procedures. Install fuel injection pump
(table 4-1).
a. Adjust fuel injection pump. Refer to TM 9-
2910-212-34 for procedures.
b. Refer to item 2c, above, for corrective
action.
c.
Refer
to
para 3-7 ,
above,
fo r
troubleshooting procedures.
d. Time fuel injection pump (table 4-1). Also
refer to TM 9-2910-212-34.
e. Remove cylinders and pistons (table 5-9)
and replace defective parts (tables 6-12 and
6-14). Install pistons and cylinders (table 5-
9).
a.
b.
c.
d.
e.
Drain oil pan and refill with proper grade
oil for prevailing temperature. Refer to
pertinent vehicle Technical Manual, Ap
pendix A.
Check engine idle speed and reset to 700 to
750 rpm.
Fill oil pan to proper level. Refer to per-
tinent vehicle Technical Manual, Appendix
A.
Remove oil pressure sending unit (table 5-
10). Install new unit (table 5-10).
Refer to 4, below, for corrective action.
f. Remove oil pressure regulator valve (table 4-
2). Replace damaged parts (para 6-38d).
Install oil pressure regulator valve (table 4-
2).
g. Refer to pertinent vehicle Technica l
Manual, Appendix A for service procedures.
h. Disassemble engine (chapter 5). Clean oil
passages (para 6-9c). Assemble engine
(chapter 7).
j. Remove oil pan (table 4-5). Clean ob-
structions from pickup tube screen. Install
oil pan, (table 4-5).
k. Remove oil pan (table 4-5). Remove oil
pump (table 5-10). Rebuild oil pump (table
6-17). Install oil pan (table 4-5).
l.
Disassemble
engine
(chapter
5).
Replace
worn bearings and necessary parts .
Assemble engine (chapter 7).
a. Refer to 1d, above, for corrective action.
b. Refer to 1f, above, for corrective action.
3- 9
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