The Stovebolt Site Forums The Shop Area Engine Shop Rochester 2G check balls

There seems to be some debate. There are 2 check balls in the rebuild kit, a larger one and a smaller one. Which one goes in the accelerator pump well, and which one goes in the pump discharge?

I'm prepared for the jokes as well as the answer...

I would like to know the answer to that question. I rebuilt mine and had the same issue. Now it doesnt run without the choke on. once the choke is off it back fires and shuts off. Its also hard to start. I have taken the carb back apart and switched the balls around and have the same problem. Is yours doing the same thing?

no, my problem is a little different. I can get it started just fine, but after a few minutes it starts sputtering and I can't keep it running. I don't think my problem is related to the check balls, but I did rebuild the carb, and just wanted to make sure I put them in the right places.

I'll be checking the vacuum hoses coming off the carb, and also maybe putting on a new fuel pump, hoping something will fix it.

Some Rochester 2GC carbs use two balls, others one only. Would be easier to give an intelligent answer if the identification number of the carburetor were given.

However, since that is not present, "shotgunning" the answer:

All of the 2GC series carbs that I have personally worked on had the larger steel ball under the venturi cluster.

Those that I have worked on that have a ball under the pump use the smaller aluminum ball under the pump.

It is possible that a siphoning action could occur if the smaller aluminum ball were placed under the venturi cluster, thus artificially enrichening the mixture causing the engine to stall from an overrich mixture.

Jon.

hmmm carbking, thanks for the answer. The carb did not have the tag, so I don't have the id numbers. I didn't think the balls could make that difference, but from what you say, that might be part of my problem after all. The first instructions I had said that the bigger ball went under the pump, but then I was told the opposite and wanted to confirm it. Guess its time to pull the carb and switch them.

John,

I've got the pump figured out, but where is the "venturi cluster" and what does it look like?

Thanks.

maybe an exploded picture would help...
http://oldcarmanualproject.com/manuals/Carbs/Rochester/2-Jet/Manual/Part2/MCarbRoch73802GPart202.jpg

you can see the ball, spring, and the retainer that holds it in (parts 42, 43, 44). All of this is under the venturi cluster (part 38). The model in the picture does not show the ball under the accelerator pump. Hope this helps...

I believe I have a model "B". Could you provide an exploded view of that model please?

Many thanks!!

Thanks Dads50.