SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 162
Cold engine
Effect Cause Troubleshooting Action
Instrument indicates
low temperature
Defective sensor/instru-
ment
Thermostat jammed in
open position
Check that sensor and instrument match each other
(120 and 150 °C)
Check with a separate instrument
Check operation of
thermostat
Coolant loss
Effect Cause Troubleshooting Action
Coolant pressed out of
radiator on DSI engines
Defective cylinder head
gasket (external leak-
age)
External leakage
Turbocharging pres-
sure enters cooling
system via leaking
charge air element
Test pressure
(air 0.5 bar, liquid 4
bar)
Crack in cylinder head
(not cracks between
valve seats)
Cracked cylinder liner
If the fault is hard to trace:
Change all cylinder heads for exchange cylinder
heads.
(Or test pressurize all cylinder heads. Heat the cyl-
inder heads before pressurizing them.)
Grey oil = Coolant in oil
Locate the leak by removing the oil sump and pres-
surizing the cooling system while turning the engine
over by hand
Polluted coolant
Faulty inhibitor
Overdosed corrosion
inhibitor
Clean the cooling system
and fill it with coolant as
described in the mainte-
nance instructions
Effect Cause Troubleshooting Action
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