Chevrolet 30 Series 1967 Service Manual page 344

AIR INJECTOR REACTOR SYSTEM 6T-2
PU M P
H O U S IN G
P R ESSU R E
RELIEF V A LV E
Fig. 2—A ir In jectio n Pump
engine component that operates in conjunction with the
A.I.R. system should malfunction, the exhaust emissions
might be increased.
Because of the relationship between "Engine Tune Up"
Drive Belt
Inspection
• Inspect drive belt for wear, cracks or deterioration
and replace if required.
• Inspect belt tension and adjust if below 50 lbs. using
a strand tension gauge.
Adjustment
• Loosen pump mounting bolt and pump adjustment
bracket bolt.
• Move pump until belt is tight (55 ± 5 lb. used belt or
75 ± 5 lb. new belt using a strand tension gauge) then
tighten adjustment bracket bolt and mounting bolt.
CAUTION: Do not pry on the pump housing.
Distortion of the housing will result in extensive
damage to the Air Injection Pump.
Replacement
• Loosen pump mounting bolt and pump adjustment
bracket bolt then swing pump until drive belt may be
removed.
• Install a new drive belt and adjust as outlined above.
Drive Pulley
Replacement
• Remove drive belt as outlined above then replace
drive pulley.
• Install and adjust drive belt as outlined above.
PU M P
C O V E R
IN TAK E
TUBE
MAINTENANCE PROCEDURES
VALVE IN
OPEN
POSITION
DIAPHRAGM
POSITIONS
Fig. 3—M ixtu re Control V a lv e
and " Unburned Exhaust Gases" , the condition of the En­
gine Tune Up should be checked whenever the A.I.R. Sys­
tem seems to be malfunctioning. Particular care should
be taken in checking items that affect fuel - air ratio such
as the crankcase ventilation system, the carburetor and
the carburetor air cleaner.
Because of the similarity of many parts, typical illus­
trations and procedures are used except where specific
illustrations or procedures are necessary to clarify the
operation.
Pump Pulley
Replacement
• Hold pump pulley from turning by compressing drive
belt then loosen pump pulley bolts.
• Remove drive belt as outlined above then remove
pump pulley.
• Install pump pulley with retaining bolts hand tight.
• Install and adjust drive belt as outlined above.
• Hold pump pulley from turning by compressing drive
belt then torque pump pulley bolts to
• Recheck drive belt tension and adjust if required.
Air Manifold, Hose and Tube
Inspection (Fig. 4)
• Inspect all hoses for deterioration or holes.
• Inspect all tubes for cracks or holes.
• Check all hose and tube connections.
• Check all tube and hose routing. Interference may
cause wear.
• If leak is suspected on the pressure side of the sys­
tem or any tubes and/or hoses have been discon­
nected on the pressure side, the connections should
be checked for leaks with a soapy water solution.
With the pump running, bubbles will form if a leak
exists.
Replacement
• To replace any hose and/or tube, note routing then
AIR INLET
VALVE IN
CLOSED
POSITION
CHECK
VALVE
ft. lbs.
25
CHEVROLET TRUCK SERVICE M ANUAL