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Anti leak rear main bearing SB? #491323 10/08/09 06:07 AM 10/08/09 06:07 AM
Joined: Jan 2003 Posts: 314 Kentucky V vern73 OP enthusiast
vern73 OP enthusiast V Joined: Jan 2003 Posts: 314 Kentucky	I have an ongoing problem with rear main seal leaking on my 360, and have replaced the seal with a new Felpro twice lately. I see there was a special anti leak bearing from Mopar Performance but they say it is not available now. The number is P4876643 and it is -.010. I wonder if anyone knows where to buy this bearing now, perhaps there are some in stock at a dealer. I have called around and not had any luck. Does anyone know where to get this rear main bearing and does it really help fix the problem? Thanks

Re: Anti leak rear main bearing SB? [Re: vern73] #491324 10/08/09 07:23 AM 10/08/09 07:23 AM
Joined: Mar 2005 Posts: 331 Cincinnati Oh F fasthawk6 enthusiast
fasthawk6 enthusiast F Joined: Mar 2005 Posts: 331 Cincinnati Oh	I had to have a freind that is a machinest make one for me this summer because i could not find one. 5532084-newdart.jpg (431 downloads)

Re: Anti leak rear main bearing SB? [Re: fasthawk6] #491325 10/08/09 07:38 AM 10/08/09 07:38 AM
Joined: Dec 2006 Posts: 4,648 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,648 aotearoa	i used to modify my std bearings with an air powered pencil grinder every time after i found out how well this trick worked. you might find a pencil grinder cheaper than the bearing so you could do it yourself. it's not rocket science.

Re: Anti leak rear main bearing SB? [Re: vern73] #491326 10/08/09 10:05 AM 10/08/09 10:05 AM
Joined: Nov 2008 Posts: 660 San Diego formula S mopar
formula S mopar Joined: Nov 2008 Posts: 660 San Diego	I use a 5.9 magnum 92 and up rear main seal. They're different than the early ones, buy one from the dealer they're a double lip seal and are rust colored. No leaks and no need for a anti leak bearing

Re: Anti leak rear main bearing SB? [Re: formula S] #491327 10/08/09 01:55 PM 10/08/09 01:55 PM
Joined: Mar 2005 Posts: 331 Cincinnati Oh F fasthawk6 enthusiast
fasthawk6 enthusiast F Joined: Mar 2005 Posts: 331 Cincinnati Oh	I never had a leak until i went with the 4" crank in a motor because they do not have knurls cut in the crank like the factory ones. If it is a after market crank make your own bearing if it is a factory crank a double may work as already noted. 5532689-newdart.jpg (382 downloads)

Re: Anti leak rear main bearing SB? [Re: fasthawk6] #491328 10/08/09 08:36 PM 10/08/09 08:36 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	Quote: I never had a leak until i went with the 4" crank in a motor because they do not have knurls cut in the crank like the factory ones. If it is a after market crank make your own bearing if it is a factory crank a double may work as already noted. I believe my 4" Callies crank had the knurls if I remember correctly its been a while since I put the motor together 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: Anti leak rear main bearing SB? [Re: vern73] #491329 10/08/09 08:55 PM 10/08/09 08:55 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	Sorry to ask, but are you sure that it is main seal The rear pan rail rubber gasket is famous for leaking if not installed properly. You have to make sure to clean the recesses in the block where the tapered tabs on the pan rail gasket sit down into. I have had better luck intalling the pan rail rubber on a very clean and dry surface with no sealent. Just a slight dab of silicone where the pan gasket mates up. As for seal intallation the best way to install one is to offset it 1/2 inch or more in the cap and block so that the parting line of seal is not at the same point as the bearing cap and block.

Re: Anti leak rear main bearing SB? [Re: dusturbd340W5] #491330 10/09/09 06:34 AM 10/09/09 06:34 AM
Joined: Mar 2005 Posts: 331 Cincinnati Oh F fasthawk6 enthusiast
fasthawk6 enthusiast F Joined: Mar 2005 Posts: 331 Cincinnati Oh	Quote: Quote: I never had a leak until i went with the 4" crank in a motor because they do not have knurls cut in the crank like the factory ones. If it is a after market crank make your own bearing if it is a factory crank a double may work as already noted. I believe my 4" Callies crank had the knurls if I remember correctly its been a while since I put the motor together Mine crank is the mopar version in my 360 block and it leaked. a couple years built a 340 4" crank motor with mopar crank had it apart 3 times before i found out about the anti leak bearing,did it all in the car at first after it keep leaking took it back to machine shop found nothing wrong still leaked put a 10$ bearing in leak fixed then a year later find out chysler discontiuned the bearings, what idiots.

Re: Anti leak rear main bearing SB? [Re: fasthawk6] #491331 10/09/09 06:40 PM 10/09/09 06:40 PM
Joined: Jan 2003 Posts: 314 Kentucky V vern73 OP enthusiast
vern73 OP enthusiast V Joined: Jan 2003 Posts: 314 Kentucky	I offset the ends of the rear main seal a quarter inch. The oil is coming from the bell housing area and is not trans. fluid because I put a dye in the motor oil and it showed up. I am putting a small sponge under the converter dust cover using the 2 seven sixteenth headed bolts and it gets oil soaked after a night of racing. What else is at the rear of the block that could leak like maybe an oil galley plug? Guess I'll have to pull the motor after the racing is over. Any ideas?

Re: Anti leak rear main bearing SB? [Re: vern73] #491332 10/09/09 08:18 PM 10/09/09 08:18 PM
Joined: Apr 2005 Posts: 1,880 USA Ron Silva top fuel
Ron Silva top fuel Joined: Apr 2005 Posts: 1,880 USA	Correct me if I am wrong....But a 360 rear main seal does not have the little rubber wings on it to seal the main cap to the block? Or is that the 340? Anyhow, if the cap does not have the grooves in it for the corresponding wings on the seal, then you need to place some Anaerobic sealer around the oil passage and along the rear of the cap to seal it. There is nothing to prevent oil running out the back of the block from you main oil pressure. I use felpro Pro Line 221. Anaerobic means it will cure and seal without the presense of air. SRT DEMON ONE SEAT

Re: Anti leak rear main bearing SB? [Re: Ron Silva] #491333 10/09/09 08:38 PM 10/09/09 08:38 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	Quote: Correct me if I am wrong....But a 360 rear main seal does not have the little rubber wings on it to seal the main cap to the block? Or is that the 340? Anyhow, if the cap does not have the grooves in it for the corresponding wings on the seal, then you need to place some Anaerobic sealer around the oil passage and along the rear of the cap to seal it. There is nothing to prevent oil running out the back of the block from you main oil pressure. I use felpro Pro Line 221. Anaerobic means it will cure and seal without the presense of air. 360 does not have them. What I am suggesting is the rear oil pan rail gasket/seal leak is possible and will look like a main seal leak.

Re: Anti leak rear main bearing SB? [Re: MoparforLife] #491334 10/09/09 08:59 PM 10/09/09 08:59 PM
Joined: Apr 2005 Posts: 1,880 USA Ron Silva top fuel
Ron Silva top fuel Joined: Apr 2005 Posts: 1,880 USA	Quote: Quote: Correct me if I am wrong....But a 360 rear main seal does not have the little rubber wings on it to seal the main cap to the block? Or is that the 340? Anyhow, if the cap does not have the grooves in it for the corresponding wings on the seal, then you need to place some Anaerobic sealer around the oil passage and along the rear of the cap to seal it. There is nothing to prevent oil running out the back of the block from you main oil pressure. I use felpro Pro Line 221. Anaerobic means it will cure and seal without the presense of air. 360 does not have them. What I am suggesting is the rear oil pan rail gasket/seal leak is possible and will look like a main seal leak. Without the anaerobic sealer it will leak for sure. It is metal to metal surface with full oil pressure spreading out in all directions. SRT DEMON ONE SEAT

Re: Anti leak rear main bearing SB? [Re: vern73] #491335 10/09/09 09:06 PM 10/09/09 09:06 PM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	The cam plug could be leaking, the oil galley plug could be leaking, the oil pan could be leaking and I've even had trouble with the intake manifold leaking down the back and making it look like something else was leaking. As for sealing the #5 main cap to the block, I like to use red loctite. Works great.

Re: Anti leak rear main bearing SB? [Re: Ron Silva] #491336 10/09/09 09:29 PM 10/09/09 09:29 PM
Joined: Jan 2003 Posts: 4,616 Kissimmee Fl. D dusturbd340W5 master
dusturbd340W5 master D Joined: Jan 2003 Posts: 4,616 Kissimmee Fl.	Quote: Quote: Quote: Correct me if I am wrong....But a 360 rear main seal does not have the little rubber wings on it to seal the main cap to the block? Or is that the 340? Anyhow, if the cap does not have the grooves in it for the corresponding wings on the seal, then you need to place some Anaerobic sealer around the oil passage and along the rear of the cap to seal it. There is nothing to prevent oil running out the back of the block from you main oil pressure. I use felpro Pro Line 221. Anaerobic means it will cure and seal without the presense of air. 360 does not have them. What I am suggesting is the rear oil pan rail gasket/seal leak is possible and will look like a main seal leak. Without the anaerobic sealer it will leak for sure. It is metal to metal surface with full oil pressure spreading out in all directions. My X block does not have the wings I used NO sealer on the cap and I have 0 leaks on the motor. 70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4

Re: Anti leak rear main bearing SB? [Re: dusturbd340W5] #491337 10/10/09 03:42 AM 10/10/09 03:42 AM
Joined: May 2007 Posts: 636 Central,Ohio FASTFISH420 mopar
FASTFISH420 mopar Joined: May 2007 Posts: 636 Central,Ohio	Check this out..This is what my engine builder used on my R3.. 5536221-IMG_0092.jpg (3396 downloads) 1969 Barracuda 8 second all/motor small block 2014 Shelby GT500 Mustang Uratchko Racing Engines www.URE-RACING.com

Re: Anti leak rear main bearing SB? [Re: FASTFISH420] #491338 10/10/09 05:53 AM 10/10/09 05:53 AM
Joined: Jan 2003 Posts: 314 Kentucky V vern73 OP enthusiast
vern73 OP enthusiast V Joined: Jan 2003 Posts: 314 Kentucky	That's a good looking seal to me. What specifically is it? Would it work for my 360? My crank does have the knurled suface where the seal rides. I used some red silicone sealer between the main cap and the block. Maybe that is not so good?

Re: Anti leak rear main bearing SB? [Re: vern73] #491339 10/10/09 07:10 AM 10/10/09 07:10 AM
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	Quote: That's a good looking seal to me. What specifically is it? Would it work for my 360? My crank does have the knurled suface where the seal rides. I used some red silicone sealer between the main cap and the block. Maybe that is not so good? I really don't see how a full circle seal could be used on a 360 How would you get it over the flange?

Re: Anti leak rear main bearing SB? [Re: rebel] #491340 01/06/10 10:59 PM 01/06/10 10:59 PM
Joined: Jan 2003 Posts: 1,620 MA R ragtop top fuel
ragtop top fuel R Joined: Jan 2003 Posts: 1,620 MA	Anyone have a picture of the anti leak bearing? Even if it is home made. I would like to try and do this myself on a Milling Machine. Thanks.

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