Doosan DA40 - Blue smoke; Fuel in the oil

Engine
SHOP MANUAL
Ch 1 page 231
Blue smoke
Fuel in the oil
Eect Cause Trouble shooting Action
Oil coating past piston
rings
Oil leakage in turbo-
charger
Check for oil in the
intake manifold after the
turbocharger
Damaged piston cooling
nozzles
- Change damaged
nozzles
Petrol in diesel oil
Eect Cause Trouble shooting Action
Dilution of oil in
sump
Unburnt fuel passes the
piston
- Normally about 1% of
fuel in the lubricating
oil per 200 h
Defective injector
Internal leakage in injec-
tion pump (worn pump
element or crack in
pump housing)
Worn/broken O-ring at
feed pump pushrod
Frequent cold starts
Dilution of oil in
sump
Worn engine
Check “blow-by” in crankcase
Correct value for new engine: 0 - +10 mm wc
(ow rate 60 - 100 l/min.)
Closed crankcase ventilation: -50 - +20 mm wc
Intake valve not opening