Chevrolet 10 Series 1970, Руководство по обслуживанию

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EMISSION CONTROL SYSTEMS 6T-3
AIR INJECTION REACTOR SYSTEM
INDEX
Page
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................................................................................ ......
6
T
-6
Check V alve (s ) ............................................................................. ......
6
T
-6
Page
Inspection ...................................................................................
6
T
-6
R e p la c e m e n t................................................................................ 6T-7
Diverter V alve ................................................................................ 6T-7
Inspection ................................................................................... 6T-7
R e p la c e m e n t................................................................................ 6T-7
A ir Injection Tube ........................................................................ 6T-7
Inspection ........................................................................ 6T-7
R e p la c e m e n t................................................................................ 6T-7
A ir Injection P u m p ........................................................................ 6T-7
Inspection .................................................................................. 6T-7
Pressure R e lie f Valve R e p la c e m e n t .........................................
6
T
-8
GENERAL DESCRIPTION
The A ir Injection R ea ctor (A .I.R .) System (fig . 3),
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 c y lin d er), an a ir d iv e rte r
v a lv e , check va lv e s and a ir m anifold assem blies, and
hoses n ecessary to connect the variou s components
(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 o r r e ­
placed by a carbu retor o r distributor designed fo r en­
gines without the A .I.R . System.
The a ir injection pump (fig . 4) with an in tegra l filte r ,
co m p resses the a ir and injects it through the a ir m ani­
folds, hoses and injection tubes into the exhaust system
in the area o f the exhaust va lves. The fre s h a ir helps
burn the unburned portion o f the exhaust gases in the
exhaust system , thus m inim izing exhaust contaminations.
The d iv e rte r va lve (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 ric h e r period.
On engine overrun the total a ir supply is dumped
through the m u ffler on the d iv e rte r valve. A t high engine
COMBUSTION PIPE ASSEMBLY
F ig . 2 —A ir In je c tio n R eactor System F ig . 3 —S chem atic o f A .I.R . System
DIVERTER VALVE
AIR INJECTION
PUMP
CHECK VALVE
CHEVROLET TRUCK SERVICE MANUAL