4 ENGIN E SY M PTOMS DIAGNOSTICS 103
4. Install radiator pressure tester with the
appropriate adapter.
WARNING: To avoid serious personal
injury, possible death and damage to the
engine:
• Always allow the engine to cool for 15
minutes.
• Wrap a thick cloth around the cap.
• Loosen cap slowly a quarter to half turn.
• Pause for a moment to avoid water or
steam scalding.
• Continue to turn the cap and remove.
• Never add cold coolant to a hot engine.
This can result in a cracked cylinder head
or crankcase.
• Never use water as a coolant substitute.
5. Pressuriz e cooling systemto96kPa(14psi).
6. Look for coolant leaking around the injector sleeve
and into the cylinder bore.
• If a leak is noticed, replace the leaking injector
sleeve and test again.
• If no leak is noticed, replace all six injector
sleeves and test again.
• If coolant continues to flow into cy linders after
all in jector sleeves were replac ed, do step 7 .
7. Remove cylinder head from engine, perform all
inspections, and pressure test cylinder head to
verify leak path. Follow the procedure in the
Engine Service Manual.
• Inspect cylinder head gasket for coolant
leaks.
• Verify crankcase and cylinder head surface
flatness using a straight edge and feeler
gauge.
• Check cylinder liner protrusion.
8. Test the cylinder head with pressure test plate to
validate the repair.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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