Komatsu PC200-8M0, Shop Manual, Page: 940 / 1254

600 Troubleshooting of engine (S-mode)
S-11 Oil is in coolant (or coolant spurts or coolant level goes down)
40-600
18
PC200, 200LC, 220, 220LC-8M0
SEN06140-00
S-11 Oil is in coolant (or coolant spurts or coolant level goes down)
General causes why oil is present in coolant
q
Internal leakage in lubrication system
q
Internal leakage in cooling system
Cause
Bro
k
e
n
cyl
ind
er
h
ead
or cylin
der hea
d
g
a
sket
Intern
al cra
cks in
cyli
nder bl
ock
H
o
les cause
d
by
p
itti
n
g
Bro
k
e
n
oil coo
ler core or
O-ring
Ques
tions
Check recent repair history.
Machine operation
hours
Operated for long period
E E
Oil level rose:
suddenly
Q Q
gradually
Q Q
Hard water is being used as coolant.
Q Q
Oil level has risen and oil is milky.
Q Q w
Check item
s
Unusual air bubbles are found in radiator, or coolant spurts.
w
T
ro
ubl
eshoo
ti
ng Pressure tightness test result of cylinder head shows oil leakage.
q
Check cylinder block.
q q
Pressure tightness test result of oil cooler shows oil leakage.
q
Remedy
Re
place
Re
place
Re
place
Re
place