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 54. TROUBLESHOOTING LUBRICATION SYSTEM - Continued
Corrective action
Malfunction
Probable causes
3.
No engine oil
c.
c.
Remove oil pan (par. 95).
Defective oil pump or
Remove oil pump assem-
pressure -
drive gears.
Continued.
bly (par. 138). Rebuild
oil pump (par. 193). Re-
place pump when unser-
viceable. Install pump
4.
a.
Improper grade oil for
Drain crankcase and re-
High engine oil
a.
fill with proper grade oil
prevailing temperature
temperature.
for prevailing tempera-
or defective sending
unit.
ture. Refer to TM 9-
2320-235-20 and LO 9-
2320-235-10. Also check
water temperature send-
ing unit (par. 75).
Fill to proper level. Re-
b.
Insufficient oil in oil
b.
fer to TM 9-2320-235-20.
pan.
c.
Remove oil cooler (par.
Restricted oil cooler or
c.
78a). Clean and inspect.
defective oil cooler by-
pass valve.
Replace when damaged or
restricted beyond repair.
Install oil cooler (par.
oilcooler bypass valve
Refer to cooling system
High engine coolant tem-
d.
d.
troubleshooting (par. 55).
perature.
Refer to fuel system trou-
e.
e.
Lean fuel mixture.
bleshooting (par. 53).
f.
f.
Disassemble engine (pars.
Tight engine bearings.
and inspect parts. Re-
place worn or damaged
parts. Assemble engine
Remove oil pan (par. 95).
Defective piston cooling
g.
g.
Remove piston cooling
nozzles (par. 150). Re-
place piston cooling noz-
zles (par. 256). Install
oil pan (par. 266e).
54
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