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Old 01-07-2018, 06:50 PM   #1
Chuck Sea/Tac
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Default Rear main oil return tube

I broke one off , flipping the engine around while installing pistons. It was tacked in place. I was able to get the broken threaded piece out easily. I went to see if I had some 5/16” ones on old caps. Found two with a ball check valve. Anyone know the “theory “ behind this??
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Old 01-07-2018, 06:53 PM   #2
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Default Re: Rear main oil return tube

They were for grain trucks. They use to pick the front of the trucks up in the air, to dump the grain. The ball kept the oil from running out of the engine.
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Old 01-07-2018, 07:31 PM   #3
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Default Re: Rear main oil return tube

Do not use 5/16 ones. If that is the size, bore to accept the newer 3/8's.

Look for other posts on the barn on how to do the complete job.

I have to leave right now.

Herm.
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Old 01-07-2018, 11:06 PM   #4
Chuck Sea/Tac
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Default Re: Rear main oil return tube

Page 306 in the service bulletins. Thanks
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Old 01-09-2018, 10:43 AM   #5
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Default Re: Rear main oil return tube

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Originally Posted by Kohnke Rebabbitting View Post
Do not use 5/16 ones. If that is the size, bore to accept the newer 3/8's.

Look for other posts on the barn on how to do the complete job.

I have to leave right now.

Herm.
I agree with Herm: 5/16" is limited to the amount of oil flow it can handle. They have caused rear main leaks for me. I change all rear caps over to 3/8".
Good Day!

www.durableperformance.net
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Old 01-09-2018, 12:11 PM   #6
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Default Re: Rear main oil return tube

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Originally Posted by Dave in MN View Post
I agree with Herm: 5/16" is limited to the amount of oil flow it can handle. They have caused rear main leaks for me. I change all rear caps over to 3/8".
Good Day!

www.durableperformance.net

I also change them to 3/8 Ford changed them to 3/8 because 5/16 is to small.
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Old 01-09-2018, 03:48 PM   #7
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Default Re: Rear main oil return tube

3/8" gives 20% more flow than 5/16", FWIW.
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Old 01-09-2018, 04:02 PM   #8
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Default Re: Rear main oil return tube

Quote:
Originally Posted by George Miller View Post
I also change them to 3/8 Ford changed them to 3/8 because 5/16 is to small.
Hey George,
I realize that the tube thread (3/8) is peculiar. Other than not having right die, is there anything that you can think of , why a guy cannot make one ?
I just got a B block without the drain tube....and as things go last few years, can not locate much when needed/wanted in stuff pile !
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Old 01-09-2018, 07:56 PM   #9
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Default Re: Rear main oil return tube

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Originally Posted by Synchro909 View Post
3/8" gives 20% more flow than 5/16", FWIW.
Actually about 50% more flow, since you square the radius and multiply by pi to find the area.
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Old 01-09-2018, 08:15 PM   #10
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Default Re: Rear main oil return tube

Quote:
Originally Posted by George Miller View Post
They were for grain trucks. They use to pick the front of the trucks up in the air, to dump the grain. The ball kept the oil from running out of the engine.
That is interesting.....I'd like to see a picture!


.
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Old 01-09-2018, 08:28 PM   #11
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Default Re: Rear main oil return tube

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Originally Posted by 1955cj5 View Post
That is interesting.....I'd like to see a picture!


.
They still dump grain that way for the trucks without a lift.
Shorpy has lots of old pictures, or Google might turn up a picture.
Google "tipping truck to dump grain"
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Old 01-09-2018, 09:18 PM   #12
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Default Re: Rear main oil return tube

Quote:
Originally Posted by hardtimes View Post
Hey George,
I realize that the tube thread (3/8) is peculiar. Other than not having right die, is there anything that you can think of , why a guy cannot make one ?
I just got a B block without the drain tube....and as things go last few years, can not locate much when needed/wanted in stuff pile !
You might use a pipe thread. It will work fine.
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Old 01-09-2018, 10:11 PM   #13
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Default Re: Rear main oil return tube

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You might use a pipe thread. It will work fine.
Ok, thanks !
Hadn't thought of that .
I guess copper pipe would work, instead of steel as used by Ford.
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Old 01-09-2018, 11:31 PM   #14
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Default Re: Rear main oil return tube

...
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Old 01-10-2018, 12:39 PM   #15
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Default Re: Rear main oil return tube

Here is what I do ...There is more to it than 3/8 . Its the number of threads per inch if you need to fit a replacement drain tube to a 3/8 hole . I use a 3/8 by 32 threads per inch tap . This works with the drain tube threads that most model A parts venders handle. This is probably an uncommon tap . I got mine from Kodiak cutting tools www.amazon.com or www.kodiakcuttingtools.com . Brattons lists the drain tubes on page 44 and yes I have performed this proceduer many times .
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Old 01-10-2018, 02:19 PM   #16
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Default Re: Rear main oil return tube

Purdy is probably correct about the 3/8 by 32 but I have found George Miller's suggestion works for me.

I use a 1/8" pipe thread tap and it always works. I spot weld the 3/8"steel pipe to the cap with stainless wire and find it holds well. I also drill out the oil passage in the cap to 3/8" when doing this conversion. Be careful, go slow, when the tip of the drill bit nears the back of the cap as the bit can bind in the grooves.

The tapped hole is not 90 degrees to the parting line of the cap. I built a jig from a cut-off of 10" structural "C" channel to position the cap to achieve the correct angle. If you place a 3/16" spacer under the front edge of cap with the rear of the cap on the bed of your drill press, the angle of the pipe will be correct. I use a 5/16" drill to prepare the cap for the 1/8" pipe thread tap and while the cap is in the jig, I use the drill press to start the tap to achieve alignment.
Photos below:
This jig is used for multiple functions...so ignore the other holes and knotches.

The bottom row of photos shows the procedure to enlarge the oil passage.
Remove galley plug with a punch...Drill passage with a 3/8" bit....continue drilling but don't drill out the back side. The last photo shows where to stop.
Good Day!
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Last edited by Dave in MN; 01-12-2018 at 10:14 PM. Reason: Add photos
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Old 01-10-2018, 03:07 PM   #17
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Default Re: Rear main oil return tube

very interesting. I have to pull the pan on my speedster as the oil plug is loose and just spins. while its out I think ill drop the rear main and do this upgrade
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Old 01-10-2018, 03:16 PM   #18
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Default Re: Rear main oil return tube

Quote:
Originally Posted by Dave in MN View Post
Purdy is probably correct about the 3/8 by 32 but I have found George Miller's suggestion works for me.

I use a 1/8" pipe thread tap and it always works. I spot weld the 3/8"steel pipe to the cap with stainless wire and find it holds well. I also drill out the oil passage in the cap to 3/8" when doing this conversion. Be careful, go slow, when the tip of the drill bit nears the back of the cap as the bit can bind in the grooves.

The tapped hole is not 90 degrees to the parting line of the cap. I built a jig to position the cap to achieve the correct angle. If you place a 1/8" spacer under the front edge of cap with the rear of the cap on the bed of your drill press, the angle of the pipe will be correct. I have a photo of my jig I will add to the post later if I can find it...or I'll take another photo.
Good Day!

Dave is right on. I also drill the oil passage also very important. You never know what you are going to find in that hole. Plus it fixes the tube from blocking the oil flow through the cap, if it is screwed in to far.
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Old 01-11-2018, 09:51 AM   #19
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Default Re: Rear main oil return tube

Quote:
I guess copper pipe would work, instead of steel as used by Ford.
I'd stay away from copper on this application. It might "work harden" from vibration and then crack and fall off. Why take a chance? Use steel and be done w/it.
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Old 01-11-2018, 01:18 PM   #20
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Default Re: Rear main oil return tube

Quote:
Originally Posted by Dave in MN View Post
Purdy is probably correct about the 3/8 by 32 but I have found George Miller's suggestion works for me.

I use a 1/8" pipe thread tap and it always works. I spot weld the 3/8"steel pipe to the cap with stainless wire and find it holds well. I also drill out the oil passage in the cap to 3/8" when doing this conversion. Be careful, go slow, when the tip of the drill bit nears the back of the cap as the bit can bind in the grooves.

The tapped hole is not 90 degrees to the parting line of the cap. I built a jig to position the cap to achieve the correct angle. If you place a 3/16" spacer under the front edge of cap with the rear of the cap on the bed of your drill press, the angle of the pipe will be correct. I use a 5/16" drill to prepare the cap for the 1/8" pipe thread tap and while the cap is in the jig, I use the drill press to start the tap to achieve alignment.
Photos below:
This jig is used for multiple functions...so ignore the other holes and knotches.
Good Day!
Good Jig, Dave.

Herm.
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Old 01-11-2018, 01:21 PM   #21
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Default Re: Rear main oil return tube

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Originally Posted by George Miller View Post
Dave is right on. I also drill the oil passage also very important. You never know what you are going to find in that hole. Plus it fixes the tube from blocking the oil flow through the cap, if it is screwed in to far.

"Always"
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Old 01-12-2018, 12:34 PM   #22
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Default Re: Rear main oil return tube

drill the oil passage? sorry maybe a dumb question. never had one apart yet. which passage are you drilling out and cleaning?
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Old 01-12-2018, 12:41 PM   #23
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drill the oil passage? sorry maybe a dumb question. never had one apart yet. which passage are you drilling out and cleaning?
You remove the "galley" plug and then drill out the passage that runs along the bottom of the cap from front to rear. Use a 3/8" drill.
I will add some photos to my previous post late tonight of the process.
Good Day!
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Old 01-12-2018, 06:09 PM   #24
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Default Re: Rear main oil return tube

photos pleas that would be great
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Old 01-16-2018, 07:14 PM   #25
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Default Re: Rear main oil return tube

Pictures:
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Old 01-17-2018, 01:42 AM   #26
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Default Re: Rear main oil return tube

If increasing the oil return tube increases the oil flow, is it a good idea to also replace the stock oil pump with a high flow oil pump that some of the suppliers sell or modify the stock one?

David Serrano
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Old 01-17-2018, 04:05 AM   #27
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Default Re: Rear main oil return tube

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If increasing the oil return tube increases the oil flow, is it a good idea to also replace the stock oil pump with a high flow oil pump that some of the suppliers sell or modify the stock one?

David Serrano
No, the stock pump gives all the oil the engine can use, and then some.
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Old 01-17-2018, 12:18 PM   #28
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Default Re: Rear main oil return tube

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No, the stock pump gives all the oil the engine can use, and then some.
Tom,

Thanks for the information.

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Old 01-17-2018, 01:09 PM   #29
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Default Re: Rear main oil return tube

ok I see I think now drill out the length ways passage aswell to a larger size ive not had an A apart yet so thanks this helps lots. is that a lead or babbet cap that goes back on the end?
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Old 01-17-2018, 10:20 PM   #30
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Default Re: Rear main oil return tube

Steel galley plug.
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Old 01-17-2018, 11:47 PM   #31
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Default Re: Rear main oil return tube

ok and these plugs are available through regular supplyers ?
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Old 01-18-2018, 08:49 AM   #32
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Default Re: Rear main oil return tube

Save the plug when you remove it; they can be re-used. If it is a loose fit, place the plug on an anvil and strike it with a hammer. The strike will flatten it and expand it at the same time.

New plugs are available at some suppliers. Snyder's has them.
A-6327-PL $1.00 / ea.

Last edited by Dave in MN; 01-18-2018 at 09:04 AM.
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Old 01-18-2018, 11:34 AM   #33
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Default Re: Rear main oil return tube

thanks very much
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