Air Horn Screw Tightening Sequence; Pump Lever Pivot Pin - Pontiac TRANS AM 1977 Service Manual

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FUEL SYSTEM
6C-49
All air horn screws must be tightened evenly and
securely. See Fig. 6C-89 for proper tightening sequence.
Fig. 6C-89 Air Horn Screw Tightening Sequence
4. Install front vacuum break diaphragm and bracket
assembly to float bowl using two retaining screws through the
bracket. Tighten screws securely.
NOTE: Do not attach vacuum break hose until vacuum
break adjustment is completed. See Adjustments.
5. Connect upper end of pump rod to pump lever by
placing rod in specified hole in lever, noted at disassembly.
Align hole in pump lever with hole in air horn casting using
Tool 5-25322. Using screwdriver, push pump lever roll pin
back through casting until end of pin is flush with casting
bosses in air horn (Fig. 6C-90).
C AUT l 0 N
:
Use care installhg the small roll pin
to prevent damage to pump lever casting bosses.
6. Connect choke rod into lower choke lever inside bowl
cavity; then install choke rod into slot in upper choke lever
and retain the choke lever to the end of the choke shaft with
attaching screw. Tighten securely (Fig. 6C-79).
NOTE: Make sure that the flats on the end of the choke
shaft align with flats in the choke lever.
NOTE: The front and rear vacuum break fast idle cam
adjustments must be performed, and the thermostatic
coil lever inside the choke housing has to be indexed
properly before installing the choke thermostatic coil
and cover assembly and gasket. Refer to the Adjustment
Procedures.
Fig. 6C-90 Pump Lever Pivot Pin
7. After the vacuum break, fast idle cam, and inside
thermostatic coil lever are adjusted, the thermostatic coil and
cover assembly and gasket should be installed and the cover
assembly rotated until the choke valve just closes. At this
point, the index cover should be adjusted. Install three choke
cover retainers and screws, and tighten securely.

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Firebird 1977

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