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 54. TROUBLESHOOTING LUBRICATION SYSTEM - Continued
Corrective action
Probable causes
Malfunction
e.
Defective oil pump.
e.
Remove oil pan (par. 95)
1.
Low engine oil
and oil pump assembly
pressure -
Continued.
assembly (par. 266a). In-
stall oil pan (par. 266a).
f.
Worn main bearings, con-
f.
Disassemble engine (pars.
necting rod bearings, or
crankshaft, main bearings,
camshaft bushing- type
and connecting rod bear-
bearings.
ings. Replace camshaft
bushing-type bearings
(par. 161), Assemble
engine (pars. 253 through
286).
a.
Faulty oil pressure send-
Change oil to recom-
a.
High engine oil
2.
mended grade as directed
ing unit or improper grade
pressure.
in LO 9-2320-235-10. Re-
of engine oil for prevailing
place oil pressure send-
temperatures.
ing unit (par. 74). Check
engine temperature gage
as directed in TM 9-
2320-235-20.
Remove oil pressure
b.
Defective oil pressure
b.
regulator valve.
regulator valve (par. 70a).
Clean, inspect, and repair
as necessary (par. 70b).
Install oil pressure reg-
ulator valve (par. 70c).
Refer to 1c, above.
c.
c.
Obstructed oil passages.
Add oil. Check pressure
a.
a.
Low oil level or defective
3.
No engine oil
gage as directed in TM
pressure gage.
pressure.
9-2320-235-20.
Remove oil pressure
b.
Obstructed oil passages
b.
regulator valve (par. 70a).
or defective oil pressure
control valve or spring.
Clean, inspect, and repair
as necessary (par. 70b).
Replace damaged parts.
Install oil pressure regu-
lator valve (par. 70c).
Disassemble engine (pars.
and inspect oil passages.
Inspect all parts. Replace
worn or damaged parts
and assemble engine (pars.
53
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