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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Problem
Irregular or low oil
pressure
© 2021 Avco Corporation. All Rights Reserved
February 2021
Table 1 (Cont.)
Fault Isolation Guide
Cause
Low engine oil level
Air leaks
Pressure relief is out of
adjustment
Dirt or metal chips under
the oil pressure relief
valve
Damaged oil pressure
relief seat
Blockage at inlet side of
oil pump
Too much internal oil
spill-off
Air leak on suction side
Corrective Action
Complete a check of the oil
level. Add oil.
Look for air leaks at the oil
sump gasket.
Increase the oil pressure by
turning the adjusting screw
counterclockwise.
Remove, disassemble, and clean
the oil pressure relief valve
Replace or repair the oil
pressure relief seat
Remove and clean the oil
suction screen and oil passage to
the inlet side of the oil pump.
Examine these area:
— Loose or missing plugs
in oil galley
— Piston cooling squirts
are blocked open (at idle
rpm)
— Too much bearing
clearance
— Cracked crankcase in the
oil galley area
Examine the conditions of
1.
these components:
— Oil suction screen
— Oil sump gasket
— Oil pump mating surface
to accessory housing
Replace cracked or damaged
2.
parts.
Ref.
12-10
72-50
OHM
OHM
12-10
OHM
OHM
12-30
Page 81
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