Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 10-14-2020, 04:18 PM   #1
Ramjet47
Junior Member
 
Ramjet47's Avatar
 
Join Date: Apr 2015
Location: Whitsundays, Queensland, Australia
Posts: 22
Default 11-A Distributor Thread Size

I have a stripped thread on a distributor I am overhauling. What is the thread size of the vacuum connection?
Ramjet47 is offline   Reply With Quote
Old 10-14-2020, 04:23 PM   #2
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 6,795
Default Re: 11-A Distributor Thread Size

3/8 -24 UNF. 99% sure can anyone confirm?
Mart is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 10-15-2020, 07:29 AM   #3
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,943
Default Re: 11-A Distributor Thread Size

NO expert BUT being a brass fitting/tube wouldn't it be a "NPT" or a National Pipe Thread because "Machine" threads do not "seal" so you couldn't seal the "vacuum" with a machine thread!!! MY "guess" would be a 1/8th NPT or 1/8 National Tapered Pipe Thread!!! AS I said....MY GUESS
rockfla is online now   Reply With Quote
Old 10-15-2020, 07:41 AM   #4
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 6,795
Default Re: 11-A Distributor Thread Size

Rock, no, mate, I just went and checked, it is the fitting for a 3/16 tube, which is 3/8-24 UNF.

A 3/8-24 tap screws in nicely but a 1/8 NPT barely starts and goes tight straight away.

It was late when I posted last night, but was able to do a physical check today.

The nut has a tapered end which bites into the pipe.

Mart.
Mart is offline   Reply With Quote
Old 10-15-2020, 07:43 AM   #5
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 6,795
Default Re: 11-A Distributor Thread Size

If you've stripped it, you could go 1/8 NPT and use an adaptor to get back to 3/16 tube.
Mart is offline   Reply With Quote
Old 10-15-2020, 07:45 AM   #6
rockfla
Senior Member
 
rockfla's Avatar
 
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 1,943
Default Re: 11-A Distributor Thread Size

Sponsored Links (Register now to hide all advertisements)
Damn bad day IF you don't "Learn something" everyday!!!! Good day, today!!! Thanks Mart
rockfla is online now   Reply With Quote
Old 10-15-2020, 07:51 AM   #7
deuce lover
Senior Member
 
deuce lover's Avatar
 
Join Date: May 2010
Location: Southern France
Posts: 3,432
Default Re: 11-A Distributor Thread Size

Here is the fitting it takes I think.3/8 24 as Mart said
Attached Images
File Type: jpg 3:8 24 fitting.jpg (32.3 KB, 11 views)
deuce lover is offline   Reply With Quote
Old 10-15-2020, 08:01 AM   #8
JM 35 Sedan
Senior Member
 
JM 35 Sedan's Avatar
 
Join Date: May 2010
Location: Near Rising Sun, Maryland
Posts: 10,178
Default Re: 11-A Distributor Thread Size

Quote:
Originally Posted by rockfla View Post
NO expert BUT being a brass fitting/tube wouldn't it be a "NPT" or a National Pipe Thread because "Machine" threads do not "seal" so you couldn't seal the "vacuum" with a machine thread!!! MY "guess" would be a 1/8th NPT or 1/8 National Tapered Pipe Thread!!! AS I said....MY GUESS
The sealing required at this fitting would not be accomplished at/or by the 3/8-24 threads.
__________________
John

"Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein
JM 35 Sedan is offline   Reply With Quote
Old 10-15-2020, 08:28 AM   #9
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 15,314
Default Re: 11-A Distributor Thread Size

Quote:
Originally Posted by Mart View Post
If you've stripped it, you could go 1/8 NPT and use an adaptor to get back to 3/16 tube.
Mart, wouldn't any adapter require a provision to seal the original 3/16 fitting. I think it is going to require some measure to repair the existing threads or switching to some other method to seal the 3/16 tube with the adapter. Unless there is an adapter that provides the seat required for the original fitting.
JSeery is online now   Reply With Quote
Old 10-15-2020, 10:51 AM   #10
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 12,059
Default Re: 11-A Distributor Thread Size

That was Ford's original compression fitting that was used clear up into the 60s at least.
rotorwrench is offline   Reply With Quote
Old 10-15-2020, 11:42 AM   #11
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,803
Default Re: 11-A Distributor Thread Size

I've always known them as "Ford Nuts".
tubman is offline   Reply With Quote
Old 10-15-2020, 11:59 AM   #12
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 15,314
Default Re: 11-A Distributor Thread Size

Ya, I would really think hard about any attempt to tap it out to a different size, could really open up a can of worms.
JSeery is online now   Reply With Quote
Old 10-15-2020, 12:55 PM   #13
supereal
Senior Member
 
supereal's Avatar
 
Join Date: Jul 2014
Location: Iowa
Posts: 1,475
Default Re: 11-A Distributor Thread Size

Ford used a lot of unusual thread sizes and pitches. At our shop we aways save any "left over" nuts and bolts. We have several coffee cans of them, and have been glad we did.
supereal is offline   Reply With Quote
Old 11-08-2020, 04:15 PM   #14
Ramjet47
Junior Member
 
Ramjet47's Avatar
 
Join Date: Apr 2015
Location: Whitsundays, Queensland, Australia
Posts: 22
Default Re: 11-A Distributor Thread Size

Thank you to all who replied. I have now re cut the thread back to 3/8x24 UNF, not perfect but with thread sealant it will be OK. Best regards Roger.
Ramjet47 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 04:02 PM.