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Farmall & IHC Tractors Discussion Forum

throttle shaft seals?

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07-08-2019 18:50:19

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FARMALL A With Zenith Carb
I think I have a leak at my throttle shaft. Can someone identify the seals I have in the following picture. Is the following correct?
What about the felt #3 and cupped brass thru hole #4 ?

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07-09-2019 08:04:20

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 Re: throttle shaft seals? in reply to sald, 07-08-2019 18:50:19  
Quoting Removed, click Modern View to see

Unless throttle shaft bushing is BADLY worn, it will not leak enough air to affect idle much, IMHO. Seals should be in place to keep dirt from being drawn in.

As to the vacuum port and using a vacuum gauge, it's no different than the vacuum port in any other engine, the vacuum DOES pulsate as each intake valve opens and a cylinder draws a charge, but automotive test vacuum gauges are "damped" and/or have a tiny orifice in them to smooth it out somewhat.

Some possible reasons that the idle needle doesn't seem to be doing it's thing...

-plugged passageway in carb body

-venturi damaged or improperly installed
-gasket between carb halves not sealing in the area around the idle passages and/or venturi, or possibly the wrong gasket.

-wrong idle needle

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07-09-2019 05:47:57

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 Re: throttle shaft seals? in reply to sald, 07-08-2019 18:50:19  
My guess is that seal goes in the bottom of the carburetor bowl. It keeps dirt out and allows gas to drain out after the engine is turned off. Just a guess.

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07-09-2019 06:03:37

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 Re: throttle shaft seals? in reply to sde, 07-09-2019 05:47:57  
I think the felt goes in the hole then the rubber seal with lips facing outward then the solid brass cap on the blind side. The other would be the same but use the cap with the hole to accommodate the shaft.

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07-09-2019 06:22:18

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 Re: throttle shaft seals? in reply to sald, 07-09-2019 06:03:37  
The felt seal is for the choke shaft, the rubber "VEE" seal is for the throttle shaft, only need one, brass "plug" with no hole seals other side..

There should be two brass plugs with holes, one to retain the choke shaft felt, and one to retain the throttle shaft "VEE" seal.

Dunno what #1 is but I don't think it's used in this area.

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07-09-2019 07:49:13

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 Re: throttle shaft seals? in reply to Bob, 07-09-2019 06:22:18  
Awesome. Thank you. I removed what I thought was installed wrong (seals) last week which freed up the shaft so it would easily go back to idle. Now when I hooked up the vacuum gauge it goes wonky and the engine stumbles. My father told me that if I didn't do the new head gasket he would look at that but because I did he thinks I have a leak which is making the needle sputter all over. I re torqued the manifold and the carb at the manifold. Also the idle screw isn't doing anything. This was all fine before I removed the seals. He is not familiar with the intake and exhaust configuration on the tractor being on the same manifold and thinks I may not be able to use a vacuum gauge at the 1/8npt port. He said it may be a pulse instead of a pure vacuum.

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