40 Troubleshooting SEN04125-02
PC130-8
17
S-8 Oil consumption is excessive (or exhaust smoke is blue) 1
General causes why oil consumption is excessive
q Abnormal consumption of oil
q Long-time operation of engine at low idle or high idle
(Do not run engine at idle for more than 20 minutes
continuously)
q External leakage of oil
q Wear of pats in lubrication system
Causes
Dust sucked in from intake system
Worn, damaged valve (stem, guide, seal)
Turbocharger
Clogged breather, breather hose
Broken piston ring
Worn piston ring, cylinder
Worn, damaged rear oil seal
Broken oil cooler
Oil leakage from oil cooler
Oil leakage from oil filter
Oil leakage from oil piping
Oil leakage from oil drain plug
Oil leakage from oil pan, cylinder head, etc.
Worn seal at turbine end
Worn seal at blower end
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EEE E
Oil consumption suddenly increased wQ
Oil must be added more frequently wQ
Oil becomes contaminated quickly QQw
Outside of engine is dirty with oil wwwww
There are loose piping clamps in intake system w
Check items
Inside of turbocharger intake outlet pipe is dirty with oil w
Inside of turbocharger exhaust outlet pipe is dirty with oil Qw
There is oil in coolant w
Oil level in clutch chamber or damper chamber is high w
Exhaust smoke is blue under light load ww
Amount of blow-by gas
Excessive QQww
None w
Troubleshooting
When intake manifold is removed, dust is found inside q
When intake manifold is removed, inside is found to be dirty abnormally q
Excessive play of turbocharger shaft qq
Check breather and breather hose directly q
When compression pressure is measured, it is found to be low qq
Inspect rear oil seal directly q
Pressure-tightness test of oil cooler shows there is leakage qq
There is external leakage of oil from engine qqqq
Remedy
Correct
Replace
Replace
Replace
Clean
Replace
Replace
Replace
Replace
Replace
Correct
Correct
Correct
Correct
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