The Ford Barn

30 A Ripper · 11-25-2013, 07:24 PM

after a mile or so drive today, it appears there is a fuel leak where the press-in tube containing the GAV enters the carb body. The tube appears to not be fully seated. Looking at MAC's assembly illustration, perhaps I'm describing the adjusting needle housing...

checking the previous owners paperwork, I see an entry in 6/2011 for a zenith gasket set & drain plug/CAD.

I was wondering if there was a more detailed carb parts breakdown showing the adjusting needle seat inside the lower carb bowl. hoping I can just remove the GAV & check the needle for wear groves, etc.

I'm hoping the somehow things got loose and I can just retighten externally.

Any comments, Thanks, Dick

160B · 11-25-2013, 07:57 PM

Every thing you want to know is at this site

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

Jazzjr · 11-25-2013, 08:01 PM

Check out these 2 links, it shows how to polish your GAV seat, on Zenith Carbs, with cast iron seats. The tube that houses the Adjusting Needle is screwed in, not pressed in.

http://modelabasics.com/carb%20basics%202.htm
http://www.model-a.org/

30 A Ripper · 11-25-2013, 08:51 PM

senior members rock! these are two sites I haven't seen and know they will be a big help.

I'll be in the garage first thing tommorrow.

Thanks again for the quick replies. Dick, Lakeland Florida.

ursus · 11-25-2013, 08:56 PM

You described your GAV housing as "a press-in tube". Is it is a press-in and not a screw-in GAV then you probably have a Model B carb, not a model-A carb.

30 A Ripper · 11-26-2013, 03:50 PM

Sponsored Links (Register now to hide all advertisements)

now this newbe is confused..A, B carbs?

What I did today: 1.visual examine found needle point/tip clean with no scoring/grooving. 2.determined "off", max lean clockwise position has in-cab knob indicator at 10 oclock. 3. with 1 full ccw turn for starting, then cw to 1/4 position, ran roughly. 4. experienced condensation running down carb & off intakemanifold.

Not sure what I've achieved but at least didn't have gas smell like yesterday.

11-25-2013, 07:24 PM	#1
30 A Ripper Member Join Date: Oct 2013 Location: Lakeland Florida Posts: 68	zenith carb leak after a mile or so drive today, it appears there is a fuel leak where the press-in tube containing the GAV enters the carb body. The tube appears to not be fully seated. Looking at MAC's assembly illustration, perhaps I'm describing the adjusting needle housing... checking the previous owners paperwork, I see an entry in 6/2011 for a zenith gasket set & drain plug/CAD. I was wondering if there was a more detailed carb parts breakdown showing the adjusting needle seat inside the lower carb bowl. hoping I can just remove the GAV & check the needle for wear groves, etc. I'm hoping the somehow things got loose and I can just retighten externally. Any comments, Thanks, Dick

11-25-2013, 07:57 PM	#2
160B Senior Member Join Date: Aug 2010 Location: Port Orchard, WA Posts: 1,498	Re: zenith carb leak Every thing you want to know is at this site http://www.model-a.org/ __________________ 1931 160B & 1931 68B If you don't have time to do it right the 1st time, how do you have time to do it the 2nd time?

11-25-2013, 08:01 PM	#3
Jazzjr Senior Member Join Date: May 2010 Location: Crown Point, NY and Punta Gorda, FL. Posts: 259	Re: zenith carb leak Check out these 2 links, it shows how to polish your GAV seat, on Zenith Carbs, with cast iron seats. The tube that houses the Adjusting Needle is screwed in, not pressed in. http://modelabasics.com/carb%20basics%202.htm http://www.model-a.org/

11-25-2013, 08:51 PM	#4
30 A Ripper Member Join Date: Oct 2013 Location: Lakeland Florida Posts: 68	Re: zenith carb leak senior members rock! these are two sites I haven't seen and know they will be a big help. I'll be in the garage first thing tommorrow. Thanks again for the quick replies. Dick, Lakeland Florida.

11-25-2013, 08:56 PM	#5
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,375	Re: zenith carb leak You described your GAV housing as "a press-in tube". Is it is a press-in and not a screw-in GAV then you probably have a Model B carb, not a model-A carb.

11-26-2013, 03:50 PM	#6
30 A Ripper Member Join Date: Oct 2013 Location: Lakeland Florida Posts: 68	Re: zenith carb leak Sponsored Links (Register now to hide all advertisements) now this newbe is confused..A, B carbs? What I did today: 1.visual examine found needle point/tip clean with no scoring/grooving. 2.determined "off", max lean clockwise position has in-cab knob indicator at 10 oclock. 3. with 1 full ccw turn for starting, then cw to 1/4 position, ran roughly. 4. experienced condensation running down carb & off intakemanifold. Not sure what I've achieved but at least didn't have gas smell like yesterday.