The Ford Barn - Oil Drain Tube Thread Size

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dmaxweb

11-12-2021 10:21 PM

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?

Glenn Thoreson

11-14-2021 11:29 AM

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.

Benson

11-14-2021 12:10 PM

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.

dmaxweb

11-14-2021 04:21 PM

Re: Oil Drain Tube Thread Size

Quote:

Originally Posted by Benson (Post 2076214)

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

Re: Oil Drain Tube Thread Size

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

Mike34s

05-22-2023 10:41 PM

Re: Oil Drain Tube Thread Size

Quote:

Originally Posted by Benson (Post 2076214)

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

Re: Oil Drain Tube Thread Size

1 Attachment(s)

Quote:

Originally Posted by dmaxweb (Post 2075743)

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 (Post 2076279)

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

Re: Oil Drain Tube Thread Size

What size were the B pipes?

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