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Re: Third rear seal leaking - very frustrated!!! [Re: roadhazard] #1366187 01/11/13 06:12 PM 01/11/13 06:12 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	Just a suggestion all silicone sealers are not the same I would use a name brand and one that is oil resistant and frankly think of using good oil fashioned Indian head brand on outside edges Also you may want to remove the plugged breather Once the leak started no way the oil is going to stop following the easiest way out and use wheel bearing Grease on the seal itself

Re: Third rear seal leaking - very frustrated!!! [Re: roadhazard] #1366188 01/11/13 07:09 PM 01/11/13 07:09 PM
Joined: Aug 2007 Posts: 902 Seattle, WA R rss super stock
rss super stock R Joined: Aug 2007 Posts: 902 Seattle, WA	Quote: Speaking of bearings...what about those bearings that have the angled grooves cut in them to divert oil away from the rear seal? I don't even know if they are available anymore or if they even helped prevent leakage. -------------------------------------------------------------------------------- From what I've heard they are no longer available. Mancini has them on their website. 440 and 426 only. It is sold as a single set for the #5 bearing. Part number is MRE4349045. $19.95.

Re: Third rear seal leaking - very frustrated!!! [Re: Paul_Fancsali] #1366189 01/11/13 07:10 PM 01/11/13 07:10 PM
Joined: Aug 2010 Posts: 343 S.E.Mich D drew72 enthusiast
drew72 enthusiast D Joined: Aug 2010 Posts: 343 S.E.Mich	The best sealant for metal mating surfaces (cap to block) is anaerobic sealer. Works great and does not change the clearance properties. Silicone will actually keep the seal retainer lifted off of the block and create more problems. Permatex makes it in small tubes.

Re: Third rear seal leaking - very frustrated!!! [Re: rss] #1366190 01/11/13 07:31 PM 01/11/13 07:31 PM
Joined: Nov 2006 Posts: 319 Northern Va M Mopar73340 enthusiast
Mopar73340 enthusiast M Joined: Nov 2006 Posts: 319 Northern Va	Quote: Quote: Speaking of bearings...what about those bearings that have the angled grooves cut in them to divert oil away from the rear seal? I don't even know if they are available anymore or if they even helped prevent leakage. -------------------------------------------------------------------------------- From what I've heard they are no longer available. Mancini has them on their website. 440 and 426 only. It is sold as a single set for the #5 bearing. Part number is MRE4349045. $19.95. I've used a couple sets of those grooved bearings on small blocks years ago. I don't know weather they help or not but the new seals didn't leak. A year or so ago I had to replace rear seal on my 408, the grooved bearings were not available so I made one like the previous ones I had used. So far no issues.

Re: Third rear seal leaking - very frustrated!!! [Re: roadhazard] #1366191 01/12/13 10:48 AM 01/12/13 10:48 AM
Joined: Jan 2007 Posts: 570 USA H Hooligan mopar
Hooligan mopar H Joined: Jan 2007 Posts: 570 USA	Looking at a rubber seal from a design stand point...since the lip on the seal is facing inward, it looks to me like when oil goes up against the lip, it would force the lip tighter against the crank. Just a wild guess!

Re: Third rear seal leaking - very frustrated!!! [Re: Hooligan] #1366192 01/12/13 11:31 AM 01/12/13 11:31 AM
Joined: Aug 2010 Posts: 343 S.E.Mich D drew72 enthusiast
drew72 enthusiast D Joined: Aug 2010 Posts: 343 S.E.Mich	That IS the idea!!!!

Re: Third rear seal leaking - very frustrated!!! [Re: drew72] #1366193 01/12/13 12:23 PM 01/12/13 12:23 PM
Joined: Apr 2006 Posts: 3,675 Akron, Ohio U.S.A. roadhazard master
roadhazard master Joined: Apr 2006 Posts: 3,675 Akron, Ohio U.S.A.	Actually it's for any positive pressure that may be in the crankcase. That much oil will most definitely overload the lip capacity of the seal. On two piece split seals there is no garter spring on the back side of the seal lip. These solely rely on an interference fit to get the job done. I have a few concepts for some new seal designs however, it is a HUGE investment just to test their abilities.

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