The Ford Barn

dmaxweb · 11-12-2021, 10:21 PM

The hole in the rear bearing cap is 1/8-27 NPT. The tubes sold by the vendors are 3/8-32 UNF..
Should they be the same?

Glenn Thoreson · 11-14-2021, 11:29 AM

Ford used two different sizes of these tubes. The one the vendors have is the later version meant to cure a problem with clogging, etc. You may have to search for a used one or drill and tap the cap for the larger tube.

Benson · 11-14-2021, 12:10 PM

Berts has both sizes of drain tubes...

https://modelastore.com/index.php?ro...&category_id=0

NOTE: Most main caps I see have a SMALL tack weld so it will not fall off.

You have to be sure when gas welding or brazing not to melt the babbit in the main cap.

Maybe an engine builder will comment on whether Mig or Tig is better.

dmaxweb · 11-14-2021, 04:21 PM

Quote:

Originally Posted by Benson

Berts has both sizes of drain tubes...

https://modelastore.com/index.php?ro...&category_id=0

NOTE: Most main caps I see have a SMALL tack weld so it will not fall off.

You have to be sure when gas welding or brazing not to melt the babbit in the main cap.

Maybe an engine builder will comment on whether Mig or Tig is better.

I checked with Steve and the 3/8" tube has 3/8-32 thread not pipe thread.

Ora at Schwalms recommended red loctite.

katy · 11-15-2021, 01:00 PM

Get a piece of 1/8 pipe and make your own drain tube.

Mike34s · 05-22-2023, 10:41 PM

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Quote:

Originally Posted by Benson

Berts has both sizes of drain tubes...

[url]https://modelastore.com/index.php?route=product/search&search=drain%20tube&category_id=0[/url retro bowl
NOTE: Most main caps I see have a SMALL tack weld so it will not fall off.

You have to be sure when gas welding or brazing not to melt the babbit in the main cap.

Maybe an engine builder will comment on whether Mig or Tig is better.

The most important is still the gas welding stage, right?

BRENT in 10-uh-C · 05-23-2023, 07:18 AM

Quote:

Originally Posted by dmaxweb

The hole in the rear bearing cap is 1/8-27 NPT. The tubes sold by the vendors are 3/8-32 UNF..
Should they be the same?

Quote:

Originally Posted by dmaxweb

I checked with Steve and the 3/8" tube has 3/8-32 thread not pipe thread.

Ora at Schwalms recommended red loctite.

Steve is correct. Just for clarity, the early A-6325-AR Cap's hole was threaded 5/16-32.

.

Manuel · 05-24-2023, 12:04 AM

What size were the B pipes?

11-12-2021, 10:21 PM	#1
dmaxweb Senior Member Join Date: May 2010 Location: Williamsburg, VA Posts: 510	Oil Drain Tube Thread Size The hole in the rear bearing cap is 1/8-27 NPT. The tubes sold by the vendors are 3/8-32 UNF.. Should they be the same?

11-14-2021, 11:29 AM	#2
Glenn Thoreson Senior Member Join Date: May 2010 Posts: 203	Re: Oil Drain Tube Thread Size Ford used two different sizes of these tubes. The one the vendors have is the later version meant to cure a problem with clogging, etc. You may have to search for a used one or drill and tap the cap for the larger tube.

11-14-2021, 12:10 PM	#3
Benson Senior Member Join Date: May 2010 Posts: 2,595	Re: Oil Drain Tube Thread Size Berts has both sizes of drain tubes... https://modelastore.com/index.php?ro...&category_id=0 NOTE: Most main caps I see have a SMALL tack weld so it will not fall off. You have to be sure when gas welding or brazing not to melt the babbit in the main cap. Maybe an engine builder will comment on whether Mig or Tig is better. Last edited by Benson; 11-14-2021 at 12:31 PM.

11-15-2021, 01:00 PM	#5
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,043	Re: Oil Drain Tube Thread Size Get a piece of 1/8 pipe and make your own drain tube. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

05-24-2023, 12:04 AM	#8
Manuel Senior Member Join Date: May 2010 Location: ACT Australia Posts: 506	Re: Oil Drain Tube Thread Size What size were the B pipes?