The Ford Barn

Motorhead327 · 10-08-2016, 06:34 PM

Anyone know what thread is used on the cast iron inlet of the Zenith carb?
If it's flare, I don't have the sealing surface inside.....it isn't pipe, I tried that and it seems to be a finer thread. Maybe I'm missing a fitting that goes there.

Carb Guy · 10-08-2016, 06:42 PM

1/2" 20

Motorhead327 · 10-08-2016, 06:48 PM

Then I'm missing that part. One side would be 1/2-20 male, the other side would be female flare? Who has it, I checked a few places and didn't see one.

redmodelt · 10-08-2016, 07:01 PM

The flare would have been a double on the line. Just use a 1/2 20 straight fitting made for the compression ring and compression ring. Make sure the line is only 1/8 inch or less past the end of the compression ring and if you have a small ball type stone clean up the seat in the carb just a bit.
Look for fuel line in Snyder's on line catalog (or which ever supplier you like).

Afordman31 · 10-08-2016, 07:12 PM

I just bought a Dremel 7/16" ball stone from true value. My carb repair book said to use this size to remove the pits where the fitting seats itself. Worked ok.

Benson · 10-08-2016, 07:25 PM

Sponsored Links (Register now to hide all advertisements)

Steel line with a fitting and ferrule used on each end of steel gas line.

Same fitting on sediment bowl as carburetor.

http://parts.modelastore.com/show_Product.asp?ID=3892

Benson · 10-08-2016, 07:40 PM

Bert's carb website explains use of Dremel #911 stone.

There is much more info on rebuilding here also!

http://www.model-a.org/dremel_911.html

Use caution here some castings are harder cast iron some are like "Butter"... go slow and check result often.

CT Jack · 10-08-2016, 08:23 PM

Go to this site http://modelabasics.com Click on carburetor and you will find all the different threat sizes listed.

Motorhead327 · 10-09-2016, 07:41 PM

OK, lets cut through all this and see if I have this right.
If I get a repro line it will come with a 1/2-20 male fitting and compression ring which will thread directly into the inlet pictured in my attachment, right?

Mitch//pa · 10-09-2016, 07:42 PM

Correct
Remember what #4 mentioned about the 1/8th rule or it will restrict the gas flow ...same goes on the sediment bulb side

Del in NE Ohio · 10-09-2016, 08:06 PM

Easy way to "set" the 1/8" depth of the fuel line. Thread a 1/2 x 20 bolt into the chamber for the screen. Insert fuel line until it just contacts the bolt. Tighten compression fitting and then remove. Then do the same thing with the other end of the fuel line that would be installed into the sediment bulb. Works for me!

CT Jack · 10-09-2016, 10:14 PM

An even easier way to set the 1/8" depth is to apply some lock tite to the ferrule ID

10-08-2016, 06:34 PM	#1
Motorhead327 Junior Member Join Date: Sep 2016 Location: Nipomo, CA Posts: 14	Threads used on Zenith carb Anyone know what thread is used on the cast iron inlet of the Zenith carb? If it's flare, I don't have the sealing surface inside.....it isn't pipe, I tried that and it seems to be a finer thread. Maybe I'm missing a fitting that goes there.

10-08-2016, 06:42 PM	#2
Carb Guy Senior Member Join Date: May 2010 Location: Wisconsin Posts: 186	Re: Threads used on Zenith carb 1/2" 20

10-08-2016, 06:48 PM	#3
Motorhead327 Junior Member Join Date: Sep 2016 Location: Nipomo, CA Posts: 14	Re: Threads used on Zenith carb Then I'm missing that part. One side would be 1/2-20 male, the other side would be female flare? Who has it, I checked a few places and didn't see one.

10-08-2016, 07:25 PM	#6
Benson Senior Member Join Date: May 2010 Posts: 2,595	Re: Threads used on Zenith carb Sponsored Links (Register now to hide all advertisements) Steel line with a fitting and ferrule used on each end of steel gas line. Same fitting on sediment bowl as carburetor. http://parts.modelastore.com/show_Product.asp?ID=3892

10-08-2016, 07:40 PM	#7
Benson Senior Member Join Date: May 2010 Posts: 2,595	Re: Threads used on Zenith carb Bert's carb website explains use of Dremel #911 stone. There is much more info on rebuilding here also! http://www.model-a.org/dremel_911.html Use caution here some castings are harder cast iron some are like "Butter"... go slow and check result often.

10-08-2016, 07:01 PM	#4
redmodelt Senior Member Join Date: May 2010 Location: Portland OR Posts: 6,340	Re: Threads used on Zenith carb The flare would have been a double on the line. Just use a 1/2 20 straight fitting made for the compression ring and compression ring. Make sure the line is only 1/8 inch or less past the end of the compression ring and if you have a small ball type stone clean up the seat in the carb just a bit. Look for fuel line in Snyder's on line catalog (or which ever supplier you like).

10-08-2016, 08:23 PM	#8
CT Jack Senior Member Join Date: May 2010 Location: Hebron, CT Posts: 432	Re: Threads used on Zenith carb Go to this site http://modelabasics.com Click on carburetor and you will find all the different threat sizes listed.

10-09-2016, 07:42 PM	#10
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Threads used on Zenith carb Correct Remember what #4 mentioned about the 1/8th rule or it will restrict the gas flow ...same goes on the sediment bulb side

10-09-2016, 08:06 PM	#11
Del in NE Ohio Senior Member Join Date: May 2010 Location: Columbiana,OH Posts: 461	Re: Threads used on Zenith carb Easy way to "set" the 1/8" depth of the fuel line. Thread a 1/2 x 20 bolt into the chamber for the screen. Insert fuel line until it just contacts the bolt. Tighten compression fitting and then remove. Then do the same thing with the other end of the fuel line that would be installed into the sediment bulb. Works for me!

10-09-2016, 10:14 PM	#12
CT Jack Senior Member Join Date: May 2010 Location: Hebron, CT Posts: 432	Re: Threads used on Zenith carb An even easier way to set the 1/8" depth is to apply some lock tite to the ferrule ID