Assembly

1945
1. Before assembling carburetor, parts should be soaked in suitable carburetor cleaning solvent, except for choke diaphragm, choke heater and some plastic parts. Do not place these parts in any liquid. Clean external surfaces of these parts with clean cloth or soft brush. Shake dirt or other foreign matter from plunger side of diaphragm. If water is used as a rinse, all traces of water must be blown from passages with compressed air.
2. Check throttle shaft for excessive wear in body. If wear is extreme, replace carburetor.
3. Install idle mixture screw and spring in body, ensuring that the tapered portion is straight and smooth. Do not forget to install plastic caps or concealment plugs after making adjustments when carburetor is installed.
4. Using new gasket, install throttle body on main body, torquing attaching screws to 30 inch lbs.
5. On 1986 models, remove all staking from vacuum piston retainer cavity, then install spring and piston in vacuum cylinder, seat the retainer and stake lightly with suitable tool.
6. On 1983-85 models, install components of vacuum piston assembly in alphabetical order, torquing screws to 30 inch. lbs.
7. Test accelerator pump discharge check ball and seat as follows:
a. Coat pump piston with oil or fill fuel bowl with clean fuel.
b. Install accelerating pump discharge check ball and weight.
c. Hold discharge check ball and weight down with a small brass rod and operate pump plunger manually.
d. If check ball and seat are leaking, no resistance will be felt when operating lever.
e. If valve is leaking, remove weight and stake ball using a suitable drift punch, being careful not to damage bore containing pump weight.
f. After staking old ball, remove it and install new ball.
g. Install weight and check for leaks.
h. If there are no leaks, remove check ball and weight from main body and install accelerator pump, pump operating rod, and rod retainer in bowl cover.
8. Install power valve assembly in bottom of fuel bowl and tighten securely, ensuring that needle valve operates smoothly.
9. Using tool C-3748 or equivalent, install main metering jet.
10. Install float shaft and position assembly in float shaft cradle, then insert retaining spring and adjust float as described under ``In-Vehicle Adjustments''. A nitrophyl float can be checked for fuel absorption by lightly squeezing between fingers. If wetness appears on surface or float feels heavy, replace float assembly.
11. Place new gasket on fuel inlet fitting and install assembly into main body, tightening securely. When replacing needle and seat assembly of inlet fitting, the float level must be checked.
12. Insert check ball and weight into accelerator pump discharge well.
13. Install bowl cover gasket on air horn.
14. Carefully position bowl cover on fuel bowl, ensuring that leading edges of accelerator pump cup are not damaged as it enters pump bore. Be careful not to damage main well tube.
15. Install bowl cover screws and tighten alternately, a little at a time, to compress gasket evenly.
16. Install fast idle cam and link.
17. Install choke vacuum diaphragm.
18. Install solenoid idle stop.
19. Install bowl vent assembly.



6145
1. Before assembling carburetor, parts should be soaked in suitable carburetor cleaning solvent, except for choke diaphragm, choke heater and plastic parts. Do not place these parts in any liquid. Clean external surfaces of these parts with clean cloth or soft brush. Shake dirt or other foreign matter from plunger side of diaphragm. If water is used as a rinse, all traces of water must be blown from passages with compressed air.
2. Check throttle shaft for excessive wear in body. If wear is extreme, replace carburetor.
3. Install idle mixture screw and spring in body, ensuring that tapered portion of screw is straight and smooth.
4. Using new gasket, install throttle body to main body, torquing screws to 30 inch lbs.
5. Remove all staking from vacuum piston assembly retainer cavity, then install spring and piston in vacuum cylinder, seat retainer and stake lightly using suitable tool.
6. Test accelerator pump discharge check ball and seat as follows:
a. Coat pump piston with oil or fill fuel bowl with clean fuel.
b. Install accelerator pump discharge check ball and weight.
c. Hold discharge check ball and weight down with small brass rod and operate pump plunger manually. If check ball and seat are leaking, no resistance will be felt.
d. If there is no resistance, remove weight and stake ball with suitable drift punch, being careful not to damage bore containing weight.
e. Remove old ball and install new one.
f. Install weight and again check for leaks.
g. If there are no leaks, remove check ball and weight from main body and install accelerator pump, pump operating rod and rod retainer in bowl cover.
7. Install power valve assembly in bottom of fuel bowl and tighten securely, ensuring that needle valve operates freely.
8. Using tool C-3748 or equivalent, install main metering jet.
9. Install float shaft and position assembly in float shaft cradle, then insert retaining pin and check that float does not bind against bowl casting. A nitrophyl float can be checked for fuel absorption by lightly squeezing between fingers. If wetness appears on surface or float feels heavy, replace float assembly.
10. Place new gasket on fuel inlet fitting and install assembly into main body, tightening securely.
11. Check float level as described under ``On-Vehicle Adjustments''.
12. Insert check ball and weight into accelerator pump discharge well.
13. Install bowl cover gasket on air horn.
14. Carefully position bowl cover on fuel bowl, ensuring that leading edges of accelerator pump cup are not damaged as it enters pump bore. Be careful not to damage main well tube.
15. Install bowl cover screws and torque alternately, a little at a time, to 30 inch lbs.
16. Position new oxygen feedback solenoid gasket on air horn and install new O-ring seal on duty cycle solenoid.
17. Apply light coat of petroleum jelly to solenoid and install solenoid in carburetor, then install mounting screws and tighten securely.
18. Route wire and tighten screw.
19. Install fast idle cam and link.
20. Install choke vacuum diaphragm.
21. Install solenoid idle stop.
22. Install bowl vent assembly.