Primary Side Vacuum Break Adjustment - GMC G Service Manual

6C1-34 CARBURETORS
0 If riveted, drill out and remove
rivets. Remove Choke Cover
and Stat Assembly.
(2) Place Fast Idle Cam on high
step against Cam Follower
Lever.
(3) Push up on Choke Stat Lever
to close Choke Valve.
(4) Check Stat Lever for correct
orientation by inserting 0.120"
plug gage in hole.
Gage should fit in hole and
touch edge of lever.
(5) Adjust, if necessary, by
bending Choke Link.
Figure 39 — Choke Link — Fast Idle Cam
Adjustment
Figure 38 — Choke Stat Lever Adjustment
J 9789-111 OR
BT 3006M
2. Open the throttle to allow the choke valve to close.
3. Position J 26701 -A and set the angle to specification:
• Rotate the degree scale until zero is opposite
the pointer.
• Center the leveling bubble.
• Rotate the scale to 46° ( ± 2.5°). Refer to "Speci­
fications" at the end of this section.
4. Place the fast idle cam on the second step against the
cam follower lever, with the lever contacting the rise
of the high step. If the lever does not contact the cam,
turn the fast idle adjusting screw inward additional
turn(s).
Important
• Final Fast Idle Speed Adjustment must be per­
formed according to the Vehicle Emission Con­
trol Information label.
5. Adjust, if bubble is not recentered, by bending the fast
idle cam kick lever with pliers.
PRIMARY SIDE VACUUM
BREAK ADJUSTMENT
Tools Required:
J 26701-A Choke Valve Angle Gage
J 23738-A Hand Operated Vacuum Pump
1. Attach a rubber band to the vacuum break lever of the
intermediate choke shaft (figures 40, 41 and 42).
L00468