Doosan DA40 - High fuel consumption; Low compression

SHOP MANUAL
Engine
Ch 1 page 244
High fuel consumption
Low compression
Eect Cause Trouble shooting Action
Faulty injector
Low charge air pressure
Adjusted injection pump
Check in a pump test
bench that the amount
(Q-mm
3
/stroke) corre-
sponds to specication
Manner of driving, oper-
ating/load conditions
Eect Cause Trouble shooting Action
Worn engine Check the compression
Broken piston rings
Incorrectly adjusted/
defective valves
Hydrostatic lock/bent
connecting rod
Readings not taken cor-
rectly
Take compression readings on a hot engine, with
all injectors removed, at starter motor speed
Check cylinders 1 - 6, then cylinder 1 again
Check that starter motor speed does not drop
Correct reading: 20 - 30 bar
Max. 3 bar dierence between cylinders