Moxy MT 31 - Coolant;Water in Oil

SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 150
Coolant/water in oil
Dilution of oil in sump
Crack in cylinder head
Crack in water jacket
on cylinder block/cyl-
inder head. (Coolant
runs down through the
pushrod hole.)
Crack in water jacket
on cylinder head.
(Coolant runs down via
the oil duct for rocker
arm lubrication.)
Run the engine until
warm.
Remove the oil sump
and all side covers.
Test pressurize the
cooling system.
If coolant seeps out
behind side covers or
at the camshaft bear-
ing there is probably
a crack in one of the
cylinder heads.
As a rule it is possible
to see which cylinder
head or heads are
leaking.
Change the cylinder
head for a exchange
cylinder head.
If no leakage can be
found, change all cylin-
der heads for exchange
cylinder heads.
Leakage in charge air
cooler core
Test pressure (air
0.5 bar, liquid 4 bar)
Oil cooler leaks when
engine is not running
Test pressurize the oil
cooler, see above
Leaky O-rings at cylinder
liner
Dilution of oil in sump
Water is condensed in
crankcase ventilation and
runs down into the sump
Leakage in telltale hole? Change liner seals
Effect Cause Troubleshooting Action