Chevrolet 10 Series 1970 Service Manual page 387

General Description ........................................................................... ......6T-3
Maintenance Procedures ................................................................... ......6T-4
Drive Belt ........................................................................................ ......6T-4
Inspection .........................................................................................6T-4
Adjustm ent ................................................................................ ......6T-4
R e p la c e m e n t................................................................................ ......6T-5
Pump Pulley .........................................................................................6T-5
R e p la c e m e n t................................................................................ ......6T-5
A ir M anifold, Hose and T u b e ...................................................... ......6T-5
Inspection ......................................................................................... 6T-5
R e p la c e m e n t................................................................................ ......
Check Valve (s) ............................................................................. ......
The A ir Injection R eactor
used on 1970 trucks consists of: the a ir injection pump
(with n ecessary brackets and d riv e attachments), a ir in­
jection tubes (one fo r each cy lin d er), an a ir d iv e rte r
v a lv e , check va lves and a ir m anifold assem blies, and
hoses n ecessary to connect
(fig- 3).
C arbu retors and distribu tors fo r engines with A .I.R .
System a re designed, p a rticu la rly, fo r these engines;
th e re fo re they should not be interchanged with or r e ­
placed by a carbu retor o r distributor designed fo r en­
gines without the A .I.R . System.
DIVERTER VALVE
CHECK VALVE
Fig . 2 —A ir In je c tio n R eactor System
AIR INJECTION REACTOR SYSTEM
Page
6
6
GENERAL DESCRIPTION
(A .I.R .) System (fig. 3),
the various components
AIR INJECTION
PUMP
INDEX
Inspection ...................................................................................
R e p la c e m e n t................................................................................
Diverter V alve ................................................................................
Inspection ...................................................................................
R e p la c e m e n t................................................................................
A ir Injection Tube
Inspection ........................................................................
R e p la c e m e n t................................................................................
A ir Injection P u m p ........................................................................
Inspection ..................................................................................
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Pressure R e lie f Valve R e p la c e m e n t .........................................
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The a ir injection pump (fig. 4) with an integral filte r ,
com p resses the a ir and injects it through the a ir mani­
folds, hoses and injection tubes into the exhaust system
in the area o f the exhaust valves. The fre s h a ir helps
burn the unburned portion of the exhaust gases in the
exhaust system , thus m inim izing exhaust contaminations.
The d iv e rte r valve (fig. 5) when trig g e re d by a sharp
in crease in m anifold vacuum, shuts o ff the injected a ir to
the exhaust port a rea s and prevents backfirin g during
this rich er period.
On engine overrun
through the m u ffler on the d iv e rte r valve. A t high engine
F ig . 3 —S chem atic o f A .I.R . System
EMISSION CONTROL SYSTEMS 6T-3
........................................................................
the total a ir supply is dumped
COMBUSTION PIPE ASSEMBLY
CHEVROLET TRUCK SERVICE MANUAL
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