Komatsu SAA6D114E-3 - Oil Is in Coolant (or Coolant Spurts Back or Coolant Level Goes Down)

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 cylinder head, head gasket Cracks inside cylinder block Holes caused by pitting Broken oil cooler core, O-ring Broken hydraulic oil cooler or power train oil cooler on applicable machine side
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EE
Oil level
Suddenly rose QQQ
Gradually rose QQ
Hard water is being used as coolant QQ
Oil level has risen and oil is milky QQw
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
Troubleshooting
Pressure-tightness test of cylinder head shows there is leakage q
Carry out
troubleshooting
on applicable
machine
Inspect cylinder block, liner directly qq
Pressure-tightness test of oil cooler shows there is leakage q
Remedy
Replace Replace Replace Replace
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