The Ford Barn

Ford_Freddie · 04-09-2016, 02:16 AM

I'm looking for the best way to smoothen the pitted seat (machined into the casting) of the gas adjusting needle in my Zenith 2 carburetor. Thank you in advance.

JD 1931 · 04-09-2016, 06:36 PM

take an old adj. needle and put valve grinding compound on tip and hold straight as possible and insert it into opening and seat, hone it back and forth. clean out with laquer thinner......

colin1928 · 04-09-2016, 07:57 PM

A old style Carburetor repairer should have the seat reface equipment that you need

Tom Wesenberg · 04-09-2016, 08:29 PM

A small drill bit running backwards with valve grinding compound on the tip should give a nice seat.

Tom Endy · 04-09-2016, 09:00 PM

I don't see a need to do anything about a cast GAV seat. Normally the GAV valve is cracked open a quarter to a half turn on most Zeniths.

You could also drill and tap a cast valve seat and install the brass valve seat used in the early Zeniths. I had a friend develop the tooling to do that. It comprised of a drill guide to drill the cast seat out, a tool to grind a flat seat, and a tap to install the threads. For a while I was using this procedure to install the brass seat on Zeniths I was restoring until it dawned on me there was not a need for it.

Tom Endy

Mike V. Florida · 04-10-2016, 12:44 AM

Sponsored Links (Register now to hide all advertisements)

http://www.model-a.org/gav_honing_tool.html

Ford_Freddie · 04-10-2016, 01:13 AM

Thank you all for the helpful answers.

04-09-2016, 02:16 AM	#1
Ford_Freddie Member Join Date: Mar 2014 Location: Rosenheim/Germany Posts: 39	Zenith 2 - pitted seat of the gas adjusting needle I'm looking for the best way to smoothen the pitted seat (machined into the casting) of the gas adjusting needle in my Zenith 2 carburetor. Thank you in advance.

04-09-2016, 06:36 PM	#2
JD 1931 Senior Member Join Date: Jul 2010 Location: west coast Fla.. Posts: 311	Re: Zenith 2 - pitted seat of the gas adjusting needle take an old adj. needle and put valve grinding compound on tip and hold straight as possible and insert it into opening and seat, hone it back and forth. clean out with laquer thinner......

04-09-2016, 07:57 PM	#3
colin1928 Senior Member Join Date: Mar 2013 Location: Australa Melbourne Posts: 878	Re: Zenith 2 - pitted seat of the gas adjusting needle A old style Carburetor repairer should have the seat reface equipment that you need

04-09-2016, 08:29 PM	#4
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Zenith 2 - pitted seat of the gas adjusting needle A small drill bit running backwards with valve grinding compound on the tip should give a nice seat.

04-09-2016, 09:00 PM	#5
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,139	Re: Zenith 2 - pitted seat of the gas adjusting needle I don't see a need to do anything about a cast GAV seat. Normally the GAV valve is cracked open a quarter to a half turn on most Zeniths. You could also drill and tap a cast valve seat and install the brass valve seat used in the early Zeniths. I had a friend develop the tooling to do that. It comprised of a drill guide to drill the cast seat out, a tool to grind a flat seat, and a tap to install the threads. For a while I was using this procedure to install the brass seat on Zeniths I was restoring until it dawned on me there was not a need for it. Tom Endy

04-10-2016, 12:44 AM	#6
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Re: Zenith 2 - pitted seat of the gas adjusting needle Sponsored Links (Register now to hide all advertisements) http://www.model-a.org/gav_honing_tool.html __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

04-10-2016, 01:13 AM	#7
Ford_Freddie Member Join Date: Mar 2014 Location: Rosenheim/Germany Posts: 39	Re: Zenith 2 - pitted seat of the gas adjusting needle Thank you all for the helpful answers.