Doosan DA40 - Hot engine

SHOP MANUAL
Engine
Ch 1 page 246
Hot engine
Eect Cause Trouble shooting Action
Instrument shows
high temperature
Defective sensor/instru-
ment
Check that sensor and instrument suit each other
(120 and 150 ° C)
Check with a separate instrument
Low coolant level
Clogged seawater lter
Clogged freshwater/sea-
water cooling system
- Clean the cooling sys-
tem internally and
externally
Pressure cap not operat-
ing
Test pressurize
Impeller on freshwater/
seawater pump worn or
damaged
Incorrect cam/worn
cover on seawater pump
Restriction in coolant
ow, e.g. pieces of rub-
ber from seawater
impeller
Cooling capacity too
low
Take a reading of the
cooling capacity
Gas leakage (causes loss
of coolant)
Defective thermostats
Check opening tempera-
ture of thermostats
Reduced coolant
ow
Drive belts slip or pump
wheel loose on pump
shaft
Air pockets in engine’s
outer cooling circuit
- Vent
at the cooling sys-
tem’s highest point
- Check that the ventila-
tion piping to the
expansion tank is not
clogged
Excessive pressure drop
in the external cooling
system
Check with forcibly
opened thermostats
Clogged radiator
Circulation of cooling
air
Check by taking temper-
ature readings
Cavitation damaged
impeller in coolant
pump
Leakage in charge air
cooler