TM 9-2350-256-20
CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
2 - 1 6 . 1 M E C H A N I C A L T R O U B L E S H O O T I N G - C o n t i n u e d
O I L C O O L I N G S Y S T E M - C o n t i n u e d
B
Check main engine crank case for proper oil level.
Refer to TM 9-2350-256-10 instructions on checking
engine oil level. Check that oil is not diluted. Dram
and refill if oil is diluted (refer to TM 9-2350-256-10).
C
Remove left- and center-front air inlet grilles (see
paragraph 9-57) and open side air inlet grille doors.
Inspect oil lines for evidence of leaking. Tighten or
replace any lines or connections that are leaking.
Check oil drain valve plug (see paragraph 3-6). If
valve plug is loose, tighten plug and recheck oil
pressure. If oil pressure is low, go to step D. If oil
pressure is high, go to step E.
CAUTION
Be sure to use the proper pressure gage for
the pressure range to be tested.
D Remove left- and center-front air inlet grilles (see
paragraph 9-57) if they have not already been
removed. Remove main engine oil pressure switch
(see paragraph 6-22) and install pressure gage
(Appendix B, item 153). If pressure gage reads 40-70
psi (276-483 kPa) at 2400 rpm and ENGINE OIL
PRESSURE gage reads lower, troubleshoot ENGINE
OIL PRESSURE gage circuit (see paragraph 2-19). If
pressure gage reads less than 40 psi (276 kPa) at 2400
rpm, notify Direct Support Maintenance.
E
Remove left- and center-front air inlet grilles (see
paragraph 9-57). Remove main engine oil pressure
switch (see paragraph 6-22) and install pressure gage
(Appendix B, item 153). If pressure gage reads 40-70
psi (276-483 kPa) at 2400 rpm and ENGINE OIL
PRESSURE gage reads higher, troubleshoot
ENGINE OIL PRESSURE gage circuit (see paragraph
2-19). If pressure gage reads higher than 70 psi (483
kPa), notify Direct Support Maintenance.
F
While an assistant operates vehicle, look at engine
exhaust. If there is excessive exhaust smoke from
one or both banks of cylinders or exhaust is oily,
remove crankcase breather tube (see paragraph 3-
10). Check to see if engine breather tube is clogged.
Service or replace clogged breather tube. If there is
no evidence of excessive exhaust smoke and exhaust
is not oily, remove left- and center-front air inlet
2-40.8
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