Rear main seal - Team Camaro Tech
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post #1 of 9 (permalink) Old May 9th, 15, 02:39 PM Thread Starter
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jerry
 
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Rear main seal

I have a 350 engine that only has about 4 k miles on it. It had not run much
In About the last 20 yrs. it now is back in the car, but it's leaking oil out
The rear main. I do not want to pull motor or pan, so I was wondering if
Anyone knows of any tricks or additives that may stop the leak. I know
This is not easy to cure this way. Any Suggs. Will be appreciated. Thanks.
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post #2 of 9 (permalink) Old May 10th, 15, 06:32 AM
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Re: Rear main seal

Jerry, I have a BBC and been after a rear main seal leak for over a year. 3 seals later and I may have just fixed it. Time will tell. I have tried everything. The additive crap did nothing for me. I'm afraid you are going to have to replace the seal.

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post #3 of 9 (permalink) Old May 10th, 15, 07:42 AM
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Re: Rear main seal

Rear main should be installed with RTV under the seal, and a little dab at the main cap corners. It should be offset a little so that the seam formed by the two halves isn't aligned with the parting line of the block and rear main cap.

If it leaks after that then there is an issue with the block or a bent crank and a line hone and a crank straightness check is in order. You can not straighten a cast crank. It has to be replaced if it is damaged. A forged steel crank will bend before it breaks. So if it is bent force from a hydraulic press or a big heavy rubber mallet applied to the opposite side will straighten it again.

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post #4 of 9 (permalink) Old May 10th, 15, 08:08 AM
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Re: Rear main seal

I replaced a rear main seal without removing the eng. ,by removing the motor mount bolts, distributor, loosen the fan shroud, lift front of engine as high as possible and remove the oil pan .
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post #5 of 9 (permalink) Old May 10th, 15, 09:37 PM
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Re: Rear main seal

First,..get the dye kit and make sure the leak isn't coming from somewhere else. Numerous other leaks can look as if it has to be coming from the rear main seal,..valve cover gaskets, oil filter, rear of the intake, distributor, etc.

Good luck!
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post #6 of 9 (permalink) Old May 11th, 15, 06:44 AM Thread Starter
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Re: Rear main seal

Thanks everyone, for your Suggs. I'm going to pick up a dye kit and
Try that. Hope the leak is coming from someplace than rear main.
At 77 it's not easy to crawl around under a car anymore. At this time,
The car is in the paint shop for a little paint work. Should have back in a week.
Will try kit then. Results later. Thanks again. Jerry.
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post #7 of 9 (permalink) Old Jun 5th, 15, 03:53 PM
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Re: Rear main seal

Ok new person here looking for help on leak. I know this post is old but just what is a dye leak kit and where would you buy one?

Thanks

Toyman
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post #8 of 9 (permalink) Old Jun 5th, 15, 09:21 PM
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Wink Re: Rear main seal

The oil leak dye/detection kits can be found at most major auto parts stores.
The Advance, NAPA, Monument and AutoZone near me all carry them.
You will need a UV light source also to observe the leak flow patterns best.

Do a 'Youtube' search, I think there are at least about 5 or so good videos on this.

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post #9 of 9 (permalink) Old Jun 6th, 15, 10:17 AM
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Re: Rear main seal

Tracerline dye kit. This photo is really for AC, however they make one for oil etc.. Part# TP 8621
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1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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