Doosan DA40 - White smoke, water vapour; Black smoke on starting

SHOP MANUAL
Engine
Ch 1 page 230
White smoke, water vapour
Black smoke on starting
Eect Cause Trouble shooting Action
Too much fuel in
relation to air at high
combustion temper-
atures
“Adjusted” injection
pump, attempt to boost
Check the lead seal - Test in test bench
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?
Nozzle tip jams
Incorrect spray pattern
from nozzle
More than 1 washer
under injector
Fault in turbo
Check charge air pres-
sure
Clogged air lter
High exhaust counter-
pressure
See trouble shooting for
High exhaust temperature
Worn intake valves
Clogged intake port
Eect Cause Trouble shooting Action
Engine dicult to
start
Binding control rack
Open the cover (RQ/
RQV) or hexagon (RSV)
on the governor and
check with a nger on
the control rod that it
goes to the maximum
stop bracket.
(This applies to engines
without a smoke limiter
on the governor hous-
ing.)
- Take the pump to a
Bosch workshop for
repair