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AIR INJECTOR REACTOR SYSTEM 6T-3
MIXTURE
CONTROL
VALVE
SIGNAL
PUMP PRESSURE
(MIXTURE VALVE INLET)
PUMP PRESSURE
(AIR MANIFOLD INLET)
I N LINE
AIR INJECTION
PUMP INLET
MIXTURE
CONTROL
VALVE
SIGNAL
MIXTURE
CONTROL
VALVE
OUTLET
MIXTURE
CONTROL
VALVE
INLET
AIR INJECTION
PUMP INLET
V 8 (TYPICAL)
PUMP PRESSURE
(AIR MANIFOLD INLET)
MIXTURE CONTROL
VALVE INLET
MIXTURE CONTROL
VALVE SIGNAL
AIR INJECTION
PUMP INLET
PUMP PRESSURE^
(AIR MANIFOLD
J
MIXTURE CONTROL
VALVE OUTLET
V8 (396-427)
Fig. 4—Air Manifold Hose and Tube Routing (Typical)
a straight pipe thread. Do not use a 1/4" tapered
pipe tap. The hoses of the Air Injection Reactor
System are a special material to withstand high
temperature.
No other type hose should be
substituted.
•
Install new hose(s) and/or tube(s), routing them as
when removed.
•
Tighten all connections.
NOTE:
Use anti seize compound on threads of
the air manifold to exhaust manifold or cylinder
head connections.
NOTE:
On Chevy n vehicles equipped with a
V8 engine, the air injection tubes are part of the
air manifold and care must be used in removing
them from the exhaust manifold. It may be
necessary to remove the exhaust manifold and
use penetrating oil on the injection tubes before
the air manifold can be removed.
Check Valve
Inspection
•
The check valve should be inspected whenever the
hose is disconnected from the check valve or when-
ever check valve failure is suspected. (A pump that
, had become inoperative and had shown indications of
having exhaust gases in the pump would indicate
check valve failure)..
•
Orally blow through the check valve (toward air
manifold) then attempt to suck back through check
valve. Flow should only be in one direction (toward
the air manifold).
Replacement
•
Disconnect pump outlet hose at check valve. Remove
check valve from air manifold, being careful not to
bend or twist air manifold.
Mixture Control Valve
Inspection
•
Check condition and routing of all lines especially
the signal line. A defective signal or outlet line will
cause malfunctioning of the mixture control valve.
•
Disconnect pump to valve inlet hose at pump.
•
Leaking valve will be indicated by an air gushing
noise coming from the hose. Place palm of hand over
hose; little or no pull with a gradual increase is
normal. If immediate strong pull is felt or air noise
is heard, valve is defective and should be replaced.
•
Open and close throttle rapidly. Air noise should be
evident and then gradually decrease.
Check for
proper valve usage. If strong pull is not felt im-.
mediately or air noise is not present, valve is not
functioning properly and should be replaced.
•
A noisy valve should be replaced.
Replacement
•
Disconnect the signal line, air inlet and air outlet
hoses then remove the valve.
•
Install new valve and connect air outlet, air inlet
and signal line hoses.
CAUTION:
Mixture c o n t r o l
valves, though
similar in appearance are designed to meet
particular requirements of v a r i o u s engines,
therefore, be sure to install the correct valve.
CHEVROLET CHASSIS SERVICE MANUAL
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