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02-10-2013, 05:44 PM | #1 |
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Join Date: May 2010
Location: Lakeville, MN
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Opinions needed on rear main leak fix
Sometime back I got an article from the Model "A" News that describes a simple rear main minor modification that supposedly eliminates or greatly reduces rear main oil leaks. The mod seems to make sense as the groove and drain hole would direct oil back to the pan and keep it from leaking out the rear main. I know that a little oil leakage is suppose to keep the wishbone ball lubed, but I can do that another way. I am pasting in two pictures of the article below. I took a picture of the top and one of the bottom of the article so the print was large enough to easily read. I am assembling an engine now and I could make the mod if it looks like it would do no harm.
Thanks for any constructive comment about the "fix" or if anyone had done the "fix". Rusty Nelson |
02-10-2013, 06:18 PM | #2 |
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Re: Opinions needed on rear main leak fix
It is a old time sleazy used car dealer fix --I was told about this fix by the same person that had me fill a trans and diff with sawdust to quiet them, and had me use newspaper behind bearing inserts to quiet a knock.---if it made the 60 miles to the auction and was still quiet I would get a bonus if it didn't go to arbitration after it was sold.
sometimes the slinger groove was filled with cotton waste or waterpump packing also ---they still leaked, but instead of a steady stream it was just a slow drip |
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02-10-2013, 06:41 PM | #3 |
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Re: Opinions needed on rear main leak fix
I agree with Kurt, jury rigging. I have done this but not since I learned how to pour babbitt. This hole is hard to fix the next time the bearings are done. Not to say it can't be done reliably but, it does make for just one more problem to fix. If the leak is that bad you need to just have the bearings re-poured.
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02-10-2013, 07:11 PM | #4 |
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Re: Opinions needed on rear main leak fix
Some 45 years ago, on two occasions, when breaking down engines, I found this modification had been done to the rear main bearing cap.
Some 30 years ago, a friend of mine was changing out the engine on his 30 Coupe with a new rebuilt "C" engine. He was going to rienstall the removed engine in a new speedster he was building. The removed engine had a bad rear main leak; I suggested we modify the rear main cap, as shown in the drawing posted, which I did. This speedster has gone through 3 owners, the engine has never been changed, and today there is still no rear main leak. As long as the babbit is good on the rear main cap, the thrust is ok, and proper clearance can be maintained, I believe this is an OK modification . I know others that have made this modification with good results. Just my opinion, Ron |
02-10-2013, 07:47 PM | #5 |
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Location: Santa Rosa, CA
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Re: Opinions needed on rear main leak fix
I have seen a couple of those holes in old main caps. Better to spend the energy correctly installing the bearing.
I dont get why people use this or any of the other gimmicks that are around. A properly prepared and installed rear main will not leak more than a few drops. And you need a bit of seepage because that seepage is the only source of lubrication for the rear thrust face between the crank and main bearing. Try it if it makes you feel good but if the job is done right you don't need it. |
02-10-2013, 07:53 PM | #6 |
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Re: Opinions needed on rear main leak fix
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Rusty Nelson |
02-10-2013, 09:53 PM | #7 |
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Location: 60615,330th Ave.,Clare, Iowa, 50524
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Re: Opinions needed on rear main leak fix
If you try to do that in a cast cap, you will have a rear thrust all broke up in a pile!!
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