Air Valve Link Adjustment; Unloader Adjustment - GMC G Service Manual

6C1-36 CARBURETORS
Figure 42 — Primary Side (Front) Vacuum Break
Adjustment
2. Open the throttle to allow the choke valve to close.
3. Position J 26701-A and set angle to specifications:
• Rotate the degree scale until zero is opposite
the pointer.
• Center the leveling bubble.
• Rotate the scale to the specified angle. Refer to
"Specifications" at the end of this section.
4. Plug vacuum break bleed holes, if applicable.
5. Adjust, if bubble is not recentered, by turning the vac­

AIR VALVE LINK ADJUSTMENT

1. Plug vacuum break bleed holes, if applicable. With
2. Gage the clearance between the air valve link and the
3. Adjust, if necessary, by bending link with J 9789-111.
1. Attach a rubber band to the vacuum break lever of the
2. Open the throttle to allow the choke valve to close.
Figure 43 — Air Vaive Link Adjustment
• Apply 51 kPa (15-inches Hg) vacuum to seat
the vacuum break plunger.
• Seat bucking spring, if applicable.
• If necessary, bend the air valve link to permit full
plunger travel, then reapply vacuum to fully
retract plunger.
uum break adjusting screw.
Tools Required:
J-23738-A Hand Operated Vacuum Pump
J-9789-111 Linkage Bending Tool
the air valves closed, apply 51 kPa (15-inches Hg)
vacuum to seat the vacuum break plunger (figure 41
and 43).
end of the slot in the air valve lever. Clearance should
be 0.6 mm (0.025-inch). Refer to "Specifications" at
the end of this section.

UNLOADER ADJUSTMENT

Tools Required:
J 26701-A Choke Valve Angle Gage
J 9789-111 Linkage Bending Tool
intermediate choke shaft (figures 40 and 44).
F-02710