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Rochester Carb Woes


Wooly15

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  • 3 years later...
On 12/14/2016 at 2:32 PM, carbking said:

During the rebuild, get the original specifications for the idle tubes in the carburetor. Drill them 0.002 oversize.

 

Make certain the "factory fix" is done in the choke vacuum supply circuit!

 

Make certain that the primary and secondary floats are NOT interchanged. Set the floats to specifications.

 

DO NOT set the idle mixture using a vacuum gauge for the highest vacuum!

 

Should run like a sewing machine.

 

Jon.

 

 

I know this is an old thread but I'm having the same issue discussed.

 

Does anyone know what is meant by the "factory fix in the choke vacuum supply circuit"?

 

Thanks!

Edited by ol' 66 C10 (see edit history)
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Rochester supplied a "kit" consisting of a very tiny bushing, and a modified air horn to bowl gasket.

 

The choke vacuum supply passage in the top of the bowl is milled slightly smaller than the O.D. of the bushing.

The bushing is pressed into the choke vacuum supply passage in the top of the bowl.

The choke vacuum supply passage in the bottom of the air horn is milled slightly larger than the O.D. of the bushing.

The carburetor is reassembled using the new air horn to bowl gasket (the vacuum passage hole has been enlarged to fit over the bushing).

 

Jon.

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