Chevrolet 10 Series 1968, Руководство по обслуживанию

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SECTION 6T
AIR INJECTION REACTOR SYSTEM
NDEX
Page
General Description .......................................................... ......6T-1
Maintenance P r o c e d u r e s ..........................................................6T-2
D rive B e l t .......................................................................... ......6T-2
In s p e c tio n ....................................................................... ......6T-2
A d ju s t m e n t ..........................................................................6T-2
Replacement
................................................................ ......6T-2
D rive P u lle y ....................................................................... ......6T-2
Replacement ................................................................ ......6T-2
Pump P u lle y ....................................................................... ......6T-2
Replacement ................................................................ ......6T-2
A ir Manifold, Hose and T u b e .......................................... ......6T-3
In s p e c tio n .............................................................................6T-3
Replacement
................................................................ ......6T-4
Page
Check V a l v e ( s ) ................................................................ ...... 6T-4
In s p e c tio n ............................................................................. 6T-4
Replacement
................................................................ ......6T-4
D iverter V a l v e ................................................................ ...... 6T-4
In s p e c tio n .............................................................................6T-4
Replacement ................................................................ ......6T-4
A ir Injection Tube ................................................................ 6T-4
In s p e c tio n ............................................................................. 6T-4
Replacement
................................................................ ...... 6T-4
A ir Injection P u m p ................................................................ 6T-5
In s p e c tio n .............................................................................6T-5
P ressu re R e lie f V alve R e p la c e m e n t................................6T-5
Special T o o l s ............................................................................. 6T-6
GENERAL DESCRIPTION
The A ir Injection Reactor (A.I.R.) System (fig. 1), used
on Chevrolet trucks consists of: the air injection pump
(with necessary brackets and drive attachments), air in­
jection tubes (one for each cylinder), an air diverter
valve, check valves (one for In-line engines, two for V8
engines) and air manifold assemblies, tubes and hoses
necessary to connect the various components.
Carburetors and distributors for engines with the A.I.R.
System are designed, particularly, for these engines;
therefore they should not be interchanged with or re­
placed by a carburetor or distributor designed for en­
gines without the A.I.R. System.
The air injection pump (fig. 2) with an integral filter,
compresses the air and injects it through the air mani­
folds, 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 contaminations.
The diverter valve (fig. 3) when triggered by a sharp
increase in manifold vacuum, shuts off the injected air to
the exhaust port areas and prevents backfiring during
this richer period.
On engine overrun the total air supply is dumped
through the muffler on the diverter valve. At high engine
CHECK VALVE
DIVERTER VALVE
AIR INJECTION
PUMP
CHECK VALVE
INJECTION
PUMP
DIVERTER VALVE
IN LINE
F ig . 1 -A ir Injection Reactor System
CHEVROLET TRUCK SERVICE MANUAL