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rear main seal install direction #998907 05/24/11 10:12 AM 05/24/11 10:12 AM
Joined: Nov 2010 Posts: 582 PA B BTTG OP mopar
BTTG OP mopar B Joined: Nov 2010 Posts: 582 PA	just to confirm before installing the right side (in picture) of this rear main seal faces towards the #3 main cap.....tapered edge (left in photo) towards the bellhousing? 6648393-hug3612a.jpg (459 downloads)

Re: rear main seal install direction [Re: BTTG] #998908 05/24/11 10:17 AM 05/24/11 10:17 AM
Joined: Feb 2003 Posts: 1,739 Grand Forks, ND Hemi_Ram top fuel
Hemi_Ram top fuel Joined: Feb 2003 Posts: 1,739 Grand Forks, ND	The right side faces #5 main brng cap and other side the bellhousing. www.picturetrail.com/hemi_ram

Re: rear main seal install direction [Re: Hemi_Ram] #998909 05/24/11 10:21 AM 05/24/11 10:21 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Agreed, the right side of the image shown, goes towards front of the engine.

Re: rear main seal install direction [Re: buildanother] #998910 05/24/11 03:21 PM 05/24/11 03:21 PM
Joined: Jan 2003 Posts: 15,548 Norwich CT USA moparts I Live Here
moparts I Live Here Joined: Jan 2003 Posts: 15,548 Norwich CT USA	Agree, Just remember on all seals the lip towards the oil Tom , 2011 Ram 3500 C&C Diesel 2009 Challenger R/T 1971 Challenger Conv. 511/4 speed 1970 Challenger R/T 503/727

Re: rear main seal install direction [Re: moparts] #998911 05/24/11 04:28 PM 05/24/11 04:28 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Just look at it like it was a dam on a river, you have the flat wall that faces the fluid to b contained then a tapered wall on the back side to support it live every 24 hour block of time like it's your last day on earth

Re: rear main seal install direction [Re: RapidRobert] #998912 05/24/11 05:46 PM 05/24/11 05:46 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Seal lip toward oil, <- ] So that any internal oil force toward will tend to spread the lips to the sealing surface of the shaft. If the oil force hits on the tapered side of the seal it would tend to 'crush' it outward away from the sealing surface of the shaft and open up letting the oil flow past.

Re: rear main seal install direction [Re: MoparforLife] #998913 05/24/11 06:27 PM 05/24/11 06:27 PM
Joined: Jan 2003 Posts: 32,920 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,920 Grand Prairie,Texas	Lip orientation The lip on the rear main seal should point toward the crankshaft and not towards the back of the engine. The lip on the seal is designed to allow oil pressure to force the seal against the crankshaft, improving its sealing capability. When the seal is pointed the wrong way, it allows oil pressure to force oil past the seal, resulting in a leak

Re: rear main seal install direction [Re: BTTG] #998914 05/25/11 11:13 AM 05/25/11 11:13 AM
Joined: Oct 2007 Posts: 734 New York R/T1968R/T super stock
R/T1968R/T super stock Joined: Oct 2007 Posts: 734 New York	Hard to see, but like they said facing in towards #5 main 6650072-DSC00114.JPG (510 downloads) Last edited by R/T1968R/T; 05/25/11 11:15 AM.

Re: rear main seal install direction [Re: R/T1968R/T] #998915 05/25/11 11:58 AM 05/25/11 11:58 AM
Joined: Feb 2005 Posts: 709 St Louis, MO 63026 convx4 super stock
convx4 super stock Joined: Feb 2005 Posts: 709 St Louis, MO 63026	If you still have a leak after replacing the seal, don't just do the job again. You need to look deeper there might be a loose cam bearing that is spinning, blocking the oil passage way. This would cause added increase in oil pressure that gets past the seal. This news sux, but it hurts less than beating your head against a wall.

Re: rear main seal install direction [Re: convx4] #998916 05/25/11 01:00 PM 05/25/11 01:00 PM
Joined: Jan 2003 Posts: 32,920 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,920 Grand Prairie,Texas	A loose cam bearing wouldn't cause a rise in oil pressure that would blow past the seal.

Re: rear main seal install direction [Re: stumpy] #998917 05/25/11 01:25 PM 05/25/11 01:25 PM
Joined: Nov 2006 Posts: 319 Northern Va M Mopar73340 enthusiast
Mopar73340 enthusiast M Joined: Nov 2006 Posts: 319 Northern Va	MP also used to make a rear main bearing that was supposed to help reduce the chance of the seal leaking. It had to grooves cut in the lower half to direct oil away from the seal. (I don't know the part # off hand). I just had this issue with my 408. I had the black seal as in the picture above and it leaked for no apparent reason. I replaced it with the orange style one as in the picture earlier in this thread and duplicated the rear main bearing like the MP unit and it solved the problem.

Re: rear main seal install direction [Re: Mopar73340] #998918 05/25/11 04:30 PM 05/25/11 04:30 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: MP also used to make a rear main bearing that was supposed to help reduce the chance of the seal leaking. It had to grooves cut in the lower half to direct oil away from the seal. Haven't used it myself but several posters have & it fixed the leak though I'd think proper use of a seal/sealer should take care of it & would b a better way of dealing w it exp as there's the oil pan junction nearby & you dont want a leak from there (or anywhere) live every 24 hour block of time like it's your last day on earth

Re: rear main seal install direction [Re: Mopar73340] #998919 05/26/11 02:05 AM 05/26/11 02:05 AM
Joined: Oct 2006 Posts: 387 Montreal PQ, Canada 74_360_Cuda enthusiast
74_360_Cuda enthusiast Joined: Oct 2006 Posts: 387 Montreal PQ, Canada	Quote: MP also used to make a rear main bearing that was supposed to help reduce the chance of the seal leaking. It had to grooves cut in the lower half to direct oil away from the seal. (I don't know the part # off hand). I just had this issue with my 408. I had the black seal as in the picture above and it leaked for no apparent reason. I replaced it with the orange style one as in the picture earlier in this thread and duplicated the rear main bearing like the MP unit and it solved the problem. +1 The Magnum orange seal (P/N 4798216AC) did it for me as well This seal has two lips, the small one is a dust shield and goes toward the bellhousing. Also, install it 1/4 inch offset so the the joint is not located between the cap & the block... Last edited by 74_360_Cuda; 05/28/11 01:16 PM.

Re: rear main seal install direction [Re: 74_360_Cuda] #998920 05/26/11 08:25 AM 05/26/11 08:25 AM
Joined: Jun 2009 Posts: 227 Bowling Green, KY K KY Charger enthusiast
KY Charger enthusiast K Joined: Jun 2009 Posts: 227 Bowling Green, KY	Good information to now!!!

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