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EXHAUST SYSTEM AND INTAKE MANIFOLD
•
EXHAUST
PIPE
HEAVY DUTY
TRUCK
Fig. 1 Exhaust
m a n u a l for a complete description, diagnosis and ser-
vice procedures on the exhaust gas recirculation sys-
t e m and components.
MANIFOLD HEAT CONTROL VALVE
A manifold heat control valve is located i n t h e
r i g h t exhaust manifold. The thermostatic controlled
valve directs heated exhaust gases to the heat cham-
ber i n the i n t a k e m a n i f o l d beneath the t h r o t t l e body.
J9011-41
Systems
(Typical)
This helps vaporize t h e fuel m i x t u r e d u r i n g the en-
gine w a r m - u p period. When the valve is closed, t h e
exhaust gases are directed to t h e heat
chamber
t h r o u g h t h e r i g h t side of the exhaust crossover pas-
sage. A f t e r c i r c u l a t i n g t h r o u g h t h e heat chamber,
the gases are r e t u r n e d to t h e exhaust manifold
t h r o u g h t h e left side o f the passage.
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