Moxy MT 26 - Hot Engine

Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 161
Hot engine
Effect Cause Troubleshooting Action
Defective sensor/instru-
ment
Low coolant level
Clogged cooling sys-
tem
Pressure cap not
operating
Impeller on coolant
pump worn or dam-
aged
Cooling capacity too
low
Gas leakage (causes
loss of coolant)
Defective thermostats
Drive belts slip or
pump wheel loose on
pump shaft
Air pockets in engine’s
outer cooling circuit
Excessive pressure
drop in the external
cooling system
Clogged radiator
Instrument shows high
temperature
Reduced coolant flow
Check that sensor and instrument suit each other
(120 and 150 °C)
Check with a separate instrument
Clean the cooling
system internally and
externally
Test pressurize
Take a reading of the
cooling capacity
Check opening
temperature of thermo-
stats
Check with forcibly
opened thermostats
Vent at the cooling sys-
tem’s highest point
Check that the ventila-
tion piping to the
expansion tank is not
clogged
Circulation of cooling
air
Cavitation damaged
impeller in coolant
pump
Leakage in charge air
cooler
Check by taking
temperature readings