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06-17-2020, 01:27 PM | #1 |
Senior Member
Join Date: Jan 2014
Location: Leo, Indiana
Posts: 235
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289 engine rear main seal leak
Has anyone tried any of the engine additives to swell gaskets to stop leaks. I realize replacement is preferred. I would like to make it through the summer and do the work this fall so I can enjoy driving it for the rest of this summer.
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06-17-2020, 02:11 PM | #2 |
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Join Date: Dec 2010
Location: p.e.i.
Posts: 1,060
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Re: 289 engine rear main seal leak
i dont know if your 64 has a pcv valve or not if it does it has to be hooked up and working or the seal will leak.
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06-17-2020, 08:31 PM | #3 |
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Join Date: May 2010
Location: Phoenix,AZ
Posts: 1,417
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Re: 289 engine rear main seal leak
Most of the cheaper ones on the market like Lucas and Barr's won't do much this is the best of the bunch if it won't fix it it's tear down time. https://gobdp.com/blog/rear-main-seal-stop-leak/ Lots of youtube videos on this product.
Last edited by JeffB2; 06-18-2020 at 06:48 PM. |
06-18-2020, 02:25 AM | #4 |
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Join Date: Feb 2019
Location: Pittsburgh PA.
Posts: 130
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Re: 289 engine rear main seal leak
I've tried them all, there is no magic fix in a bottle!
The only way to stop an oil leak is to install new seal. Drive your car as much as you can and enjoy it. |
08-07-2021, 11:04 AM | #5 |
Senior Member
Join Date: Jan 2014
Location: Leo, Indiana
Posts: 235
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Re: 289 engine rear main seal leak
Well replacing the rear main seal I found a real mess. it Took heck of an effort to get out the 1/2 seal above the crank. It was loaded with black RTV. I spent a couple of hours running fine brushes in the bearing slot to get the crap out. Wouldn't you know it, the NEW Felpro main seal leaks. Who ever loaded the old seal with RTV knew something I didn't. All I can do again is lift the engine and try another seal....ANY SUGGESTIONS WOULD BE APPRECIATED. Thanks Rob
Last edited by callbald; 08-07-2021 at 11:10 AM. |
08-07-2021, 11:32 AM | #6 |
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Location: NE Iowa
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Re: 289 engine rear main seal leak
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08-07-2021, 12:06 PM | #7 |
Senior Member
Join Date: Jan 2014
Location: Leo, Indiana
Posts: 235
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Re: 289 engine rear main seal leak
Crank does not have a lap groove worn in. Yes the seals part lines are staggered about 1/4 inch and the ends siliconed as well was cap corners. All I can think of is some material is still in the bearing OR there is a manufactured problem in the upper seal area. Maybe I should silicone this one too.
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08-07-2021, 01:46 PM | #8 |
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Join Date: May 2010
Location: The Inland Empire of Washington State
Posts: 368
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Re: 289 engine rear main seal leak
As mentioned, make sure the pcv system is operating properly. If not, the crankcase pressure (blowby) has to go somewhere and a rear main seal is one of those places. Are you sure the rear main bearing and crank are within tolerances? If it's not, it'll be tough to seal. I assume you are using a neoprene replacement seal and not another rope and that you removed the original steel pin in the main cap that would keep the rope from moving. That said, you mentioned staggering the seal, and you did install it the correct direction, sharp edge towards the front. A suggestion is that you don't get carried away with the silcone, a small film on the outside and just a tiny dab on the ends. Too much and it will cause the seal edge to not flex properly and the oil will pass thru.
One last thought, are you sure it's the main seal that's leaking and not the rubbber seal at the rear of the oil pan? |
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