Komatsu 114E-3 Series, Shop Manual, Page: 276 / 342

SEN00458-01 40 Troubleshooting
18
114E-3 Series
S-11 Oil is in coolant (or coolant spurts back or coolant level goes
down) 1
General causes why oil is in coolant
q
Internal leakage in lubrication system
q
Internal leakage in cooling system
Causes
Broken cylin
der hea
d,
he
ad ga
ske
t
Cracks inside
cylinder
block
Hol
es
ca
used by pitting
Broken oi
l co
ole
r core, O-rin
g
Broken hyd
ra
ulic oi
l co
oler or
pow
er train
o
il
cool
er o
n
app
licab
le machin
e side
Qu
esti
ons
Confirm recent repair history
Degree of use of machine
Operated for long period
E E
Oil level
Suddenly rose
Q Q Q
Gradually rose
Q Q
Hard water is being used as coolant
Q Q
Oil level has risen and oil is milky
Q Q w
Check items
There are excessive air bubbles in radiator, coolant spurts back
w
Hydraulic oil or power train oil on applicable machine side is milky
w
When hydraulic oil or power train oil is drained, water is found
w
T
roub
leshooting
Pressure-tightness test of cylinder head shows there is leakage
q
Carry out
trou
ble
sh
ooting
o
n appl
icabl
e
m
a
chine
Inspect cylinder block, liner directly
q q
Pressure-tightness test of oil cooler shows there is leakage
q
Remedy
Repl
ace
Repl
ace
Repl
ace
Repl
ace
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