The rear main bearing has a threaded 1/2 in diameter hole where an oil return flow tube is screwed in. This tube channels oil back to the pan rather than allowing it to flow back into the flywheel, creating an oil leak. What is the thread type for this..seems very fin threaded, possibly size 32 threads?
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Vince’s site and the suppliers list the pipe as 3/8th....ck this link for more info
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctr -
Isn't that for Model A and Model B. I have a 1933 early v8, and the thread into the main cap is 1/2, and the tube is 1/2 diameter S shaped with an end ball?Comment
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It's 1/2" - 32 tpi.. for the V-8
You assumption on the first post is correct.png "smile")
3~ Tudor's & 1~ Coupe
Henry Ford said,
"It's all nuts and bolts"
"Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible."
Mitch's Auto Service ctrComment
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This gallery has 1 photos.Comment
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The hole in the rear main bearing cap is 1/8" NPT but the the thread on the tubes sold by the vendors is 3/8-32. They sorta thread together. Is that correct?11-12-2021, 06:27 PM -
I am in the process of cleaning any sludge and old oil from my A’s little motor. Dropped the oil pan and I guess I am missing the rear main cap drain tube. Yikes...02-07-2019, 10:23 AM -
I was about to re-install my oil pan with the engine in the car. Decided to clean the rear main oil drain tube with a Q-tip (bad idea). When I pulled the Q-tip out the cotton on the end was missing. I tried to unscrew the tube but it will not budge i don’t want it to break off. I am considering making a small sewer cleaner out of wire and try to screw it into the tube so I can catch the cotton...10-24-2021, 08:51 PM -
Just bought a new to me 1929 model a pickup. Engine runs fine with no knocks. After a 20 minute test drive and parked on concrete, oil flowed out of flywheel housing. A area approximately 18 inches In diameter. Oil also leaking from left side of engine pan and base of oil fill pipe.
I have all of Les Andrews books. Question, is it possible to remove pan and the rear main cap for inspection...You do not have permission to view this gallery.
This gallery has 1 photos.01-23-2020, 08:31 AM -
AFTER PUTTING ABOUT 50 MILES ON MY 29 MODEL A . THE NEXT MORNING I NOTICED A A FAIRLEY LARGE OIL SPOT UNDER THE REAR MAIN . I AM PLANNING ON DROPING THE PAN SOON , ANY THOUGHTS TO WHAT I MIGHT FIND ARE APPRECIATED08-05-2018, 03:56 PM -
I’ve had my rear main bearing cap off for over a week and was expecting the oil in the back of the valve chamber to slowly ooze down the oil gallery and past the crankshaft and drip out. There’s still a bunch of oil in the valve chamber and I don’t see oil coming out around the crank. Would this mean the oil gallery is stopped up, or is it even supposed to work that way?.gif "confused")
11-02-2021, 12:19 AM -
I've dropped the pan to check the bearings and replace the leaking gasket. I believe this is the first time the pan has been off since the previous owner had the motor rebuilt.
An extension has been added to the oil drain tube. The extension is crimped and it looks like there is a ball bearing loose in the tube behind the crimp. Any ideas what this is for?
...06-16-2021, 03:32 PM -
I have heard the story that over-filling the pan on an A engine will cause the rear main to leak. I have no reason to NOT believe this, but I would sure like to understand WHY it is so.
Anybody with the answer?
Thanks.
Bill02-19-2019, 09:54 PM -
I have an oil fill tube that does not have a removable cap. It does have a flexible vent pipe going down the side. What is this thing?05-31-2017, 07:50 AM -
So I've been driving this car a week or two now, parked in garage it leaks no oil, go for a drive and come back and park it on driveway and it drips oil from the weep hole in the bell housing for 5 or 10 minutes after I return. Clearly leaking while running. Read some about clogged oil return line from the rear main bearing, and other issues regarding leak at bearing and/or seal. Have read other sources...11-13-2019, 09:34 AM
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