Chevrolet 70 1969 Series, Shop Manual

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FUEL TANK AND EXHAUST 8B-6
SECTION 8B
EXHAUST SYSTEM
MAINTENANCE
E X H A U S T L E A K S
Exhaust system should be inspected periodic­
ally for leaks. Exhaust leaks should be repaired
without delay.
CAUTION
If gasoline engine model is oper­
ated with a faulty exhaust system,
poisonous (carbon monoxide) gas may
enter cab and cause serious or fatal
injury to personnel. Carbon monoxide
may or may not have a detectable odor
and is tasteless and colorless. In the
presence of carbon monoxide, physical
symptoms such as headache, eye smart­
ing and/or drowsiness may or may not
be experienced.
Exhaust gas from Diesel engines is considered
to be non-toxic; however, Diesel exhaust will dis­
place air and cause various physical discomforts.
If it is absolutely necessary to operate vehicle
while an exhaust leak exists, use extreme caution
and keep cab well ventilated.
E X H A U S T R E S T R IC T IO N
Excessive exhaust back pressure is caused by
exhaust restrictions. Such restrictions are usually
the result of a kinked or crimped tailpipe. If there
is suspicion that an exhaust restriction exists, the
system should be inspected immediately and re­
paired as soon as possible. The following are
symptoms that can occur with excessive exhaust
back pressure:
1. Power loss.
2. Encouraged exhaust leaks.
3. Increased fuel consumption.
4. High engine temperature.
5. Possible severe damage to engine combus­
tion chamber components.
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L