SHOP MANUAL
Engine
Ch 1 page 232
Oil in coolant
Coolant/water in oil
Eect Cause Trouble shooting Action
Oil cooler leaks when
engine is running
Test pressurize the oil cooler
Note: classed oil cooler, test pressurized: 10 bar oil
on the oil side, 0.5 bar air on the water side,
immersed in water 25 - 27 ° C
Defective cylinder head
gasket
Crack in cylinder head
(not cracks between
valve seats).
(On 11-series engines:
look for cracks between
the water jacket and oil
duct.)
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.)
Eect Cause Trouble shooting Action
Dilution of oil in
sump
Oil cooler leaks when
engine is not running
Test pressurize the oil
cooler, see above
Leaky O-rings at cylin-
der liner
Leakage in telltale hole? - Change liner seals
water is condensed in
crankcase ventilation
and runs down into the
sump
14-series engine:
Clogged drain hole in
coolant pump in combi-
nation with leaking
pump seal
Dilution of oil in
sump
Crack in cylinder head Run the engine until
warm.
Remove the oil sump
and all side covers.
Test pressurize the cool
-
ing system.
If coolant seeps out
behind side covers or at
the camshaft bearing
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
Crack in water jacket on
cylinder block/cylinder
head. (Coolant runs
down through the push-
rod hole.)
Crack in water jacket on
cylinder head. (Coolant
runs down via the oil
duct for rocker arm
lubrication.)
Cracked water-cooled
exhaust manifold
Leakage in charge air
cooler core
Test pressure (air
0.5 bar, liquid 4 bar)
Water enters via the
exhaust/intake system
- Install a self-closing
cover on the exhaust
pipe
- Position the air cleaner
so that water cannot
run into it
To Next Page
Loading...