M farmall carb

ldj · Jun 14, 2011

How do you change the seat for the main needle adjustment?

rustyfarmall · Jun 14, 2011

(quoted from post at 05:48:47 06/14/11) How do you change the seat for the main needle adjustment?

That seat is pressed in. Only way to get it out is to drill it. A replacement seat is obsolete and not available. Why do you want to change it?

ldj · Jun 14, 2011

Rusty Farmall,
We Kinda got double posted here. I am helping the guy you answered over on Farmall. The seat (Tube)is cracked. My guess is someone tightened that needle too tight probably with pliers. The tractor just don't run right and not sure it is because of that seat. Seems low on power. I would think that cracked seat would cause it to be rich and or very touch on getting the right setting. It isn't running real rich. Even if that isn't the problem, we want to change it if possible.

rustyfarmall · Jun 14, 2011

(quoted from post at 07:03:07 06/14/11) Rusty Farmall,
We Kinda got double posted here. I am helping the guy you answered over on Farmall. The seat (Tube)is cracked. My guess is someone tightened that needle too tight probably with pliers. The tractor just don't run right and not sure it is because of that seat. Seems low on power. I would think that cracked seat would cause it to be rich and or very touch on getting the right setting. It isn't running real rich. Even if that isn't the problem, we want to change it if possible.

I've heard of drilling it out, threading the hole, and then screwing in a jet from a 4 barrell Holly. I've never done it, but I think it would somewhat of a challenge to find the correct sized jet. Might be easier and less expensive to find another carburetor.

pete 23 · Jun 14, 2011

Finding those main jets has been a problem for many years. About 12 years ago I was lucky enough to have my parts man friend latch on to a couple of them but I used both of them so do not have any more. You can pull them with a slide hammer and a screw on the end. You will need to determine the correct size jet if and when you do find one or even a screw in one for that matter. It doesn't work well to have a way over sized jet and try to adjust with the adjustment needle. You can easily drill one out to correct size but making them smaller , well. You need wire gauge drill bits to be precise, not fractions like I have seen some use. What gets me though is all these carburetors on the market that claim to be rebuilt. They have to have some supplier for all the parts to get it done right.

M farmall carb

ldj

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rustyfarmall

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ldj

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rustyfarmall

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pete 23

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