The Ford Barn - View Single Post - Modification to idle circuit in Zenith A and B carburetors

Jim/GA · 10-03-2020, 08:20 PM

Instead of a gasket, I use a small bead of non-hardening gas-proof sealer on the jet where it contacts the cast iron body to ensure a good seal.

The idle jet has a tapered end that presses up against the cast iron threaded opening when the jet is screwed in tight. The brass tapered end gets chewed up by the edge of the casting when it seals. Over time it just doesn't seal very well.

I suppose a little gasket will work.

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10-03-2020, 08:20 PM	#2
Jim/GA Senior Member Join Date: May 2010 Location: Young Harris, GA Posts: 1,821	Re: Modification to idle circuit in Zenith A and B carburetors Instead of a gasket, I use a small bead of non-hardening gas-proof sealer on the jet where it contacts the cast iron body to ensure a good seal. The idle jet has a tapered end that presses up against the cast iron threaded opening when the jet is screwed in tight. The brass tapered end gets chewed up by the edge of the casting when it seals. Over time it just doesn't seal very well. I suppose a little gasket will work. . __________________ Jim Cannon Former MAFCA Technical Director "Have a Model A day!"