Front Cover Inspection - Navistar International DT 466 Diagnostic/Troubleshooting Manual

2. Remove the coolant inlet and outlet hoses for the
air compressor from the crankcase.
3. Fill air compressor coolant passage and hoses
with coolant.
4. Adapt air pressure fitting and regulator to one of
the coolant hoses and block opposite hose.
5. Pressurize air compressor coolant hoses to 96
kPa (14 psi).
6. Inspect for coolant leakage from oil drain-back
hose or left side of front cover. 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.
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.

Front Cover Inspection

Figure 126 Front cover coolant leak location
1. Remove front cover and inspect gaskets and
sealing surfaces following 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.
111