Navistar International DT 466 Diagnostic/Troubleshooting Manual page 142

138
7. If there is coolant loss without engine overheating,
check for coolant in exhaust.
• If coolant is leaking from exhaust or can be
smelled in the exhaust, go to "Coolant Leak
to Exhaust" (page 117) in this section.
8. If engine has fuel knock or evidence of fuel in
exhaust, remove exhaust manifolds and inspect
for fuel in the exhaust ports.
injectors, missing or damaged O-ring and copper
gasket on bottom of injector).
9. Inspect air induction system for evidence of water
ingestion or evidence of unfiltered air entering the
engine.
• Water ingestion could have caused a
hydraulic lock and bent connecting rods. If
water ingestion is suspected, identify smoking
cylinders by removing exhaust manifolds and
running engine.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
4 ENGINE SYMPTOMS DIAGNOSTICS
(Suspect loose
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
• Unfiltered air entering the engine can
cause excessive power cylinder wear and
turbocharger compressor blade damage. If
power cylinder wear is suspected, identify
smoking cylinder(s) by removing exhaust
manifolds and running engine.
• If coolant is found in the intake manifold,
check cylinder head cup plugs and intake
manifold. Go to "Coolant Leak to Exhaust"
(page 117) in this section.
10. If engine is overheating with coolant loss,
and cylinder head gasket or injector sleeve is
suspected for leaking, go to "Combustion Leaks
to Coolant" (page 102) in this section.