Chevrolet 30 Series 1967 Service Manual page 343

AIR INJECTION REACTOR SYSTEM
General D e s c r ip t io n ......................................................... 6T-1
Maintenance P ro c e d u re s ................................................... 6T-2
Drive Belt ......................................................................6T-2
Inspection..................................................................... 6T-2
A d ju stm en t.................................................................. 6T-2
Replacement ............................................................... 6T-2
Drive P u l l e y .................................................................. 6T-2
Replacement ............................................................... 6T-2
Pump P u l l e y ...................................................................6T-2
Replacement ............................................................... 6T-2
A ir Manifold, Hose and T u b e ........................................6T-2
Inspection......................................................................6T-2
R e p la c e m e n t................................................................6T-2
The Air Injection Reactor (A.I.R.) System (fig. 1), used
on all engines in 10 Series and Suburban Carry-All 20
Series Trucks in California consists of: the air injection
pump (with necessary brackets and drive attachments),
air injection tubes (one for each cylinder), a mixture
control valve, check valves (one for In Line engines, two
for V engines) and air manifold assemblies, tubes and
8
hoses necessary to connect the various components.
Carburetors and distributors for engines with the
A.I.R. System are designed, particularly, for these en­
gines; therefore, they should not be interchanged with or
replaced by a carburetor or distributor designed for an
engine without the A.I.R. System.
The air injection pump (fig. 2) picks up fresh filtered
air from the air cleaner, compresses the air and injects
SECTION 6T
INDEX
Page
Check V a l v e ( s ) ............................................................... 6T-3
Mixture Control Valve ....................................................6T-3
A ir Injection T u b e ......................................................... 6T-3
A ir Injection Pump
Special T o o l s ..................................................................... 6T-5
GENERAL DESCRIPTION
it through the air manifolds, hoses and injection tubes
into the exhaust system in the area of the exhaust valves.
The fresh air ignites and burns the unburned portion of
the exhaust gases in the exhaust system, thus minimizing
exhaust contamination.
The mixture control valve (fig. 3) when triggered by a
sharp increase in manifold vacuum, supplies the intake
manifold with fresh filtered air to lean out the fuel-air
mixture and prevent exhaust system backfire.
The check valve(s) prevent exhaust gases from entering
and damaging the air injection pump, as back flow can
occur even under normal operating conditions.
When properly installed and maintained, the A.I.R.
System will keep exhaust emissions well below the re­
quirements. However, if any A.I.R. component or any
Fig . 1—A ir Injectio n Reactor System
Inspection..................................................................... 6T-3
Replacement ............................................................... 6T-3
Inspection..................................................................... 6T-3
Replacement ............................................................... 6T-3
Inspection..................................................................... 6T-3
Replacement ............................................................... 6T-4
...................................................... 6T-4
Inspection..................................................................... 6T-4
Pressure Relief Valve Replacement........................... 6T-4
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CHEVROLET TRUCK SERVICE M ANUAL