Chapter 9 TROUBLESHOOTING
9-9
Malfunction of Lubricating System
Table 9-8 Malfunction of lubrication system
Problem Cause Remedy
A
Oil pressure does not rise imme-
diately after startup.
a Engine oil level too low
Check oil level gage, and add oil
if level is low.
b Engine oil viscosity too high for
smooth pumping of oil
(Especially when temperature
is low)
Change oil to one with appropri-
ate viscosity.
c Clogged oil pump suction side
or strainer screen
Remove pipe from pump dis-
charge side, and check oil dis-
charge. If no oil is discharged,
disassemble, clean and repair, or
replace.
d Malfunction of regulator valve
Repair or replace defective parts,
such as broken valve spring and
seized valve.
e Clogged oil filter element Disassemble, clean, replace.
f Defective oil pressure gage
Disconnect oil pressure gage
pipe. If oil pours out, replace oil
pressure gage.
B
Oil pressure drops gradually dur-
ing operation.
a Clogged oil filter element Disassemble, clean, replace.
b Engine oil viscosity too low
Oil temperature rises and causes
oil pressure to drop. Change oil to
one with higher viscosity.
c Abnormally high oil tempera-
ture
Engine is overheated. Do not
operate engine until oil tempera-
ture is low.
d Tendency toward bearing seiz-
ing
Disassemble, repair.
C
Oil pressure abruptly drops dur-
ing operation and remains there.
a Damage bearing causing
increased oil leaks
Disassemble and repair.
b Cracking in engine oil pas-
sage, or oil leakage from joint
Check for leaks, and repair or
replace defective parts.
D
Oil pressure fluctuates suddenly
during operation.
Engine oil level too low, causing
air to mix into oil
Check oil level gage, and add oil
if level is low.
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