Doosan DA40 - White smoke; White smoke, water vapour

Engine
SHOP MANUAL
Ch 1 page 229
White smoke
White smoke, water vapour
Eect Cause Trouble shooting Action
Incompletely burnt
fuel
Cold engine
The white smoke starts
to turn blue and disap-
pears when the engine is
warmed up
- If possible: reduce
engine speed or put the
engine under load
- Install a white smoke
limiting device
(exhaust brake)
- Install ame heater
- Install an engine heater
Too much fuel in
relation to air at low
combustion temper-
atures
Injection timing too late
Inlet valve does not open
properly. Valve adjust-
ment disturbed
Broken delivery valve
spring, uncontrolled
injection
Disconnect one delivery pipe at a time and listen
for changes in the engine sound.
WARNING!
!
Be careful when disconnecting the delivery
pipes as the pressure is extremely high and
could cause injury
Leaky injector, drip-
ping?
Eect Cause Trouble shooting Action
Water in the com-
bustion chamber
Leaky charge air cooler
Test pressure (air
0.5 bar, liquid 4 bar)
Leaky cylinder head
gasket
The fault is also present
when the engine is hot
Cracked water-cooled
exhaust manifold
Cracked cylinder head
(not cracks between
valve seats).
If the fault is hard to trace:
Change all cylinder heads for exchange cylinder
heads.
(Or test pressurize all cylinder heads. Heat the cyl-
inder heads before pressurizing them.)
Crack in cylinder liner