Oil Is In Coolant (Or Coolant Spurts Back Or Coolant Level Goes Down) - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02634-02
S-11 Oil is in coolant
(or coolant spurts back or coolant level goes down)
General causes why oil is in coolant
• Internal leakage in lubrication system
• Internal leakage in cooling system
Confirm recent repair history
Degree of use of machine Operated for long period
Increase of oil level
Hard water is being used as coolant
Oil level has risen, oil is milky
There are excessive air bubbles in radiator, coolant spurts back
Hydraulic oil or power train oil is milky
When hydraulic oil or power train oil is drained, water is found
Pressure-tightness test of cylinder head shows there is leakage
Inspect cylinder block, liner directly
Pressure-tightness test of oil cooler shows there is leakage
18
Suddenly occurred
Gradually occurred
40 Troubleshooting
1
Cause
E E
Q Q
Q Q
Q Q
Q Q w
w
w
w
q
q q
q q
Remedy
PC300, 350-8