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 80 of 779
Malfunction
3. No engine oil pressure.
4. High engine oil tem-
perature.
5. Excessive oil consumption.
3-10. Troubleshooting Cooling Syste m
1. Cooling fans not operating.
2, Cooling fam operate but
engine does not cool.
Probable Cause
c. Improper grade of oil for
prevailing ambient temperatures.
d. Obstructed crankcase oil passages.
a. Low oil level.
b. Oil pressure sending unit not
functioning properly.
c. Obstructed crankcase oil passages.
d. Oil pressure regulator valve not
functioning properly.
e. Oil pump or drive gears failed.
a.
b.
c.
d.
e.
Restricted air flow through oil
coolers.
Oil temperature sending unit not
functioning properly.
High oil temperature warning light
sending switch not functioning
properly ).
Oil cooler thermostatic bypass
valve not functioning properly.
Restricted engine oil cooler.
f. Cooling fan clutch slipping or
inoperative. Engine runs hot.
g. Excessive fuel, engine runs hot.
h. Defective pieton cooling nozzles.
a. High oil temperature or oil leaks.
b. Improper grade oil for prevailing
‘ temperature.
c. Restricted crankcase breather
system.
d. Worn or scored pistons, cylinders,
or rings.
e. Worn valve stems or valve guides.
f. Worn or leaking turbosup-
ercharger oil scale.
a. Fan drive clutch slipping or
inoperative.
b. Fan drive gear train not func-
tioning.
a. Oil cooler thermostatic bypass
valve not functioning properly.
b. Defective oil cooler bypass valve.
Corrective Action
c. Drain crankcase oil and fill with proper
grade oil. Refer to pertinent vehicle
Technical Manual, Appendix A.
d. Refer to 1h, above, for corrective action.
a. Fill oil pan to proper level Refer to per-
tinent vehicle Technical Manual, Appendix
A for proper grade oil for prevailing tem-
perature.
b. Refer to 1 d, above, for corrective action.
c. Refer to 1 h, above, for corrective action.
d. Refer to 1 f, above, for corrective action.
e. Refer to 1 k, above, for corrective action.
a. Remove oil cooler air restrictions or replace
damaged screens, deflectors, and baffles
(tables 5-2 and 5-7 ).
b. Replace aending unit (tables 5-10 and 7-3).
c. Replace switch (tables 5-10 and 7-3).
d. Replace valve ( para 6-38).
e. Remove engine oil cooler (table 5-2). Clean
and repair oil cooler (table 6-3 7). Install oil
cooler (table 7-1 2).
f. Refer to para 3-10 for corrective action.
g. Refer to fuel system troubleshooting, para
3-8, for corrective action.
h. Remove oil pan (table 4-5). Inspect pump
and nozzle. Replace defective parts. Install
oil pan (table 4-5).
a. Refer to 4, above, for corrective action.
Repair oil leaks.
b. Refer to pertinent vehicle Technical
Manual, Appendix A, for proper grade for
prevailing temperature.
c. Remove (table 5-5), clean (para 6-2) and
install (para 7-9) breather tubes
d. Refer to para 3-8, 4e.
e. Remove cylinders and replace defective
parts. Assemble cylinders.
f. Refer to para 3-7, 1c for corrective action.
a. Rebuild front fan drive clutch (table 6-24).
Rebuild rear fan drive clutch (table 6-24).
b. Disassemble engine (chapter 5). Replace
damaged parts. Assemble engine (chapter
7).
a. Refer to 4d, above.
b. Replace valve (table 6-37).
3-10
Back to Top
