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102
Combustion Leaks to Coolant
Symptom
Combustion leaks can be identified by coolant
overflowing from deaeration tank or air bubbles in the
coolant.
Cause
•
Failed injector sleeve
•
Failed air compressor
•
Failed head gasket
•
Failed EGR cooler
•
Porous or cracked cylinder sleeve
The likely cause of combustion gas leakage to
the cooling system is past the injector sleeve in the
cylinder head. A failed cylinder head gasket or porous
/ cracked cylinder sleeve is possible. However, this
should not be considered unless there is evidence of
engine overheating or high engine mileage without
proper coolant conditioning.
Tools
•
Radiator pressure testing kit
•
Plastic surge tank cap adapter
•
Cylinder head test plate
•
Water supply housing pressure adapter
•
Thermostat opening pressure adapter (cylinder
head)
•
Hose pinch-off pliers (2)
Procedure
1. Is the engine equipped with an air compressor?
•
If yes, do step 2.
•
If no, do step 3.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
4 ENGINE SYMPTOMS DIAGNOSTICS
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Figure 110 Air compressor coolant hoses
2. Close off both coolant hoses for the air
compressor with hose pinch-off pliers.
the system again.
•
If coolant continues overflowing from the
deaeration tank, do step 3.
•
If coolant stops overflowing from deaeration
tank, repair or replace the air compressor.
3. Remove injectors following the procedure in the
Engine Service Manual.
Figure 111 Cylinder head cut-away with injector
sleeve
Test
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