TM 5-3805-262-20
3-4. ENGINE TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. LOW ENGINE OIL PRESSURE (Cont).
S t e p 3 . ( C o n t ).
Install a zero to 100 psi pressure gage in port from which engine
oil pressure switch was removed.
Tell assistant to start engine and operate at idle speed .
Pressure gage should indicate 45 to 60 psi with engine at normal
operating temperature.
Tell assistant to shut off engine.
Disconnect zero to 100 psi pressure gage from engine oil pressure
switch port .
a. If pressure gage indicates 45 to 60 psi with engine at normal
operating temperature, replace engine oil pressure switch (page
5-114).
b. If pressure gage does not indicates 45 to 60 psi, reinstall
engine oil pressure switch (page 5-114).
Go to step 4 below.
Step 4. Check for engine oil leaks at rocker arm cover gaskets, oil pan
gasket, timing gear and fuel pump gear cover gaskets, engine oil
f i l t e r , e n g i n e o i l c o o l e r ; e x t e r n a l o i l l i n e s b e t w e e n c y l i n d e r b l o ck
and fuel injection pump, cylinder block and air compressor, and
timing gear cover and air compressor; and oil drain plug gasket.
a. If oil leaks are seen, tighten hardware. If tightening hardware
does no good, notify next higher maintenance level to replace
leaking gaskets.
b. If oil leaks are not seen, notify next higher maintenance level
(additional tests must be performed.)
10. ENGINE WILL NOT SHUT DOWN.
Check that fuel shut off lever moves to stop position when assistant pulls
SHUT OFF control out fully.
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