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 TM 55-1905-219-14-3
Table 3-7. Propulsion Engine - Low Oil Pressure Troubleshooting. (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
LUBRICATING OIL GRADES
DESCRIPTION
SPECIFICATION
OES ( Sub Zero)
MIL - L - 10295
OE/HDO - 10
MIL - L - 2104
OE/HDO - 20
MIL - L - 2104
OE/HDO - 30
MIL - L - 2104
Check for fuel leaks at the injector nut seal ring and fuel pipe connections. Leaks at these
points will cause lubricating oil dilution. Refer to paragraph 3-15.
2. Poor circulation.
Step 1.
Check cooler for clogging.
A plugged oil cooler is indicated by excessively
high lubricating oil temperature. Remove, and
clean the oil cooler core. Refer to paragraph
3-17.
Step 2.
Check for cooler by-pass valve not functioning
properly.
Remove the by-pass valve. Clean the valve and
valve seat and inspect the valve spring. Refer
to paragraph 3-36.
Step 3.
Check for pressure regulator valve that is not
functioning properly.
Remove the pressure regulator valve. Clean the
valve and valve seat and inspect the valve spring.
Refer to paragraph 3-36.
Step 4.
Check for excessive wear on crankshaft bearings.
a. Change the bearings.
Refer to paragraph 3-41.
3-52
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