Doosan DA40 - Low engine output

Engine
SHOP MANUAL
Ch 1 page 245
Low engine output
Eect Cause Trouble shooting Action
Low fuel supply pres-
sure (below 0.3 bar)
Check the feed pump and overow valve for leak-
age as described in the workshop manual
Look for leakage in the suction pipe between tank
and feed pump
Clogged fuel lter/Paran precipitation in fuel
Faulty injector
Fuel too hot
Incorrect fuel specica-
tion
Check density and vis-
cosity
Low charge air pressure Check charge air pressure
Abnormal pressure drop
in intake piping
Check the vacuum before the turbocharger, max.
500 mm wc
Check the air lter
Worn engine
Check “blow-by” in crankcase
Correct value for new engine: 0 - +10 mm wc
(ow rate 60 - 100 l/min.)
Worn crankcase ventilation: -50 - +20 mm wc
Leaky valves
Take compression read-
ings and compare those
of the dierent cylinders
Wrong injection timing
Incorrectly adjusted
governor/throttle control
Check that the governor
starts deregulating at the
intended speed
Check that the throttle
control goes to the maxi-
mum stop bracket
Intake air temperature
too high
Check the temperature
of the air before the
engine.
Above +25 ° C reduces
engine power
Exhaust counterpres-
sure too high
Take a reading, recom-
mended counterpres-
sure:
500 mm wc,
max. 1000 mm wc
Intake counterpressure
too high
See “Low charge air
pressure”, page “Low
charge air pressure”
Incorrectly adjusted
injection pump
Check in a pump test
bench
Blocked fuel consump-
tion gauge
Binding injector
Injector’s nozzle nut
tightened too hard
Exhaust brake/white
smoke limiter throttle in
closed position