4 ENGIN E SY M PTOMS DIAGNOSTICS 111
2. Remove the coolant inlet and outlet hoses for the
air com pressor from the crankcase.
3. Fill air compressor coolant passage and hoses
with coolant.
4. Adapt air pressure fitting an d regulato r to one of
the coolant hoses and block opposite hose.
5. Pressurize air compressor c o olant h oses to 96
kPa (14 psi).
6. Inspect for coolant leakage from oil drain-back
hose or left side of front c over. Listen for air
escaping.
• If a leak is noticed, repair or replace the air
compressor.
• If coolant is not leaking, do “Front Cover
Inspection” (page 111).
7. Test the cooling system again after any repair to
validate the repair.
Front Cover Inspection
Figure 126 Front cover coolant leak location
1. Remove front cover and inspect gaskets and
sealing surfaces f ollo wing the procedure in the
Engine Service Manual. Check front cover and
crankcase with straight edge and feeler gauge.
Repair or replace as required.
2. Test the cooling system again after any repair 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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