Rear main seal - FFCars.com : Factory Five Racing Discussion Forum
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post #1 of 10 (permalink) Old 03-04-2019, 07:45 PM Thread Starter
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Rear main seal

I primed the engine and there was a little bit leaking from the 2 peice main seal. Is this normal. It sat for some time now and I'm putting the transmission on today and there is no oil.

Is it ok to put a little gasket sealer around the outside just to makensure?

Jason

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post #2 of 10 (permalink) Old 03-04-2019, 08:02 PM
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If you want to try it, be sure to wash it down with some carb cleaner and try the gray stuff. It seems more oil resistant that others I have tried. Good luck.

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post #3 of 10 (permalink) Old 03-04-2019, 08:43 PM Thread Starter
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If you want to try it, be sure to wash it down with some carb cleaner and try the gray stuff. It seems more oil resistant that others I have tried. Good luck.
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post #4 of 10 (permalink) Old 03-04-2019, 09:52 PM
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Quote:
Originally Posted by jhargrove View Post
I primed the engine and there was a little bit leaking from the 2 peice main seal. Is this normal. It sat for some time now and I'm putting the transmission on today and there is no oil.

Is it ok to put a little gasket sealer around the outside just to makensure?

Jason
No, it isn't. Priming the oil produced, what, 10psi? Give or take? And no crankcase pressure? What do you think is going to happen when the engine is running?


Stop now, and fix it. Otherwise you'll be fixing it later and it will be a lot more work.
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post #5 of 10 (permalink) Old 03-04-2019, 10:17 PM
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I'm in Bob's camp. Even though the two piece seals are notorious for leaking they aren't supposed to and you aren't going to plug it up by smearing schmutz on the outside. If you're lucky maybe what you saw was just stray assembly lube but I recommend that you prime it again and see if you have a leak under pressure. Whole lot easier to address now than after it's installed...

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post #6 of 10 (permalink) Old 03-04-2019, 11:00 PM Thread Starter
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I'm in Bob's camp. Even though the two piece seals are notorious for leaking they aren't supposed to and you aren't going to plug it up by smearing schmutz on the outside. If you're lucky maybe what you saw was just stray assembly lube but I recommend that you prime it again and see if you have a leak under pressure. Whole lot easier to address now than after it's installed...

Jeff
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post #7 of 10 (permalink) Old 03-05-2019, 12:41 PM
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The rear main seal does not seal oil pressure. It is only sealing oil splash. I once had good luck sealing the rear intake manifold to block joint. Washed it w/ brake cleaner, blew it dry, 3 cycles. Smeared Ultra Grey on the outside. Figured I'd do it right when I had more time. Never re-did it cause it never leaked. But a rear main is such a pain to work on later.....

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post #8 of 10 (permalink) Old 03-05-2019, 01:03 PM Thread Starter
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The rear main seal does not seal oil pressure. It is only sealing oil splash. I once had good luck sealing the rear intake manifold to block joint. Washed it w/ brake cleaner, blew it dry, 3 cycles. Smeared Ultra Grey on the outside. Figured I'd do it right when I had more time. Never re-did it cause it never leaked. But a rear main is such a pain to work on later.....
The key is to actually put a rear main seal on in the first place. Lol I cant wait till the car and this engine building is over!
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post #9 of 10 (permalink) Old 03-05-2019, 06:38 PM
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You are learning a lot. Everything has to be nearly perfect when building an engine. It is not easy so use your patience or find someone to do it for you.

Glen
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post #10 of 10 (permalink) Old 03-05-2019, 07:07 PM Thread Starter
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You are learning a lot. Everything has to be nearly perfect when building an engine. It is not easy so use your patience or find someone to do it for you.

Glen
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