138 4 ENGINE SYMPTOMS DIAGNOSTICS
7. If there is c oolant 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. (Suspect loose
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.
•Unfiltered air entering the engine can
cause excessive power cylinder w ear and
turbocharger compressor blade damage. If
power cylinder wear is suspected, identify
smoking cylinder(s) by removing exhaust
manifolds and running engine.
• If c oolant 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 overhe ating with coolan t loss,
and cylin der head gasket or injector sleeve is
suspected for leaking, go to “Combustion Leaks
to Coolant” (page 102) in this section.
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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