Rear main seal kit RB?

Posted By: HOTMOPR

Rear main seal kit RB? - 05/29/12 02:23 AM

Whats the best rear main seal kit out there for a big block? I am so f'ing tired of these mother f'ers leaking I am gonna go insane!! Brand new motor with 4 passes and its leaking! The f'ing girdle is leaking too!

Posted By: BIG BEAR

Re: Rear main seal kit RB? - 05/29/12 02:42 AM

Best Machine sells one

Posted By: 8urvette

Re: Rear main seal kit RB? - 05/29/12 03:15 AM

hughes engines will be selling a 1 piece main seal soon.

Posted By: HOTMOPR

Re: Rear main seal kit RB? - 05/29/12 03:28 AM

Ya I went to there site looking for it. I wonder when it will be for sale??

Posted By: 8urvette

Re: Rear main seal kit RB? - 05/29/12 04:18 AM

i know, i would be very tempted to pull my pan and put one in if its out in the next few days.... Its sitting on the stand, ready for it. if it were ready to be sold!

Posted By: Leon441

Re: Rear main seal kit RB? - 05/29/12 07:35 AM

Having trouble with one on a stock B engine as well. Going to change out in a week or two.

Leon

Posted By: rebel

Re: Rear main seal kit RB? - 05/29/12 08:08 AM

fit a vac pump, problem solved

Posted By: bobs66440

Re: Rear main seal kit RB? - 05/29/12 10:45 AM

On my recent 440 build, I used the rear main seal and this set up from the FelPro gasket kit for the side seals. It consists of two pipe cleaners that you are supposed to dip in water. First, you fill the side cavities of the retainer with silicone, then push the wet pipe cleaners into the slot. It's supposed to cure the silicone since it requires moisture (never knew this). It sounded crazy to me, but I tried it anyway. I also siliconed around the outside of the seal where it meets the block and cap (I'm using a 440Source cap), and siliconed the cap to block mating surfaces. I have about 150 miles on it so far with not a drop of oil leaking.

Posted By: HOTMOPR

Re: Rear main seal kit RB? - 05/30/12 12:47 AM

Quote:

fit a vac pump, problem solved

I probably will need one of those too!! Just trying to figure out a low buck way to do it. Cant do the 900 bucks for one right now!

Posted By: herkamer

Re: Rear main seal kit RB? - 05/30/12 04:04 PM

Quote:

hughes engines will be selling a 1 piece main seal soon.

Called this morning, 6-8 weeks is the expected delivery.

Posted By: Moparnut426

Re: Rear main seal kit RB? - 05/30/12 04:48 PM

Quote:

Quote:

hughes engines will be selling a 1 piece main seal soon.

Called this morning, 6-8 weeks is the expected delivery.

So is this a cut circle and you wind it in?

Curious on this one...

OK, just checked it out on their site, Looks like quite a deal there.

If its sucessfull Ill buy one for the 440 for sure....

Posted By: Cab_Burge

Re: Rear main seal kit RB? - 05/30/12 07:09 PM

I bought several,12, Federal Mogul rear main seal kits with the newer grey side seals, I fill the main seal holder edges to the block up with clear adhesive silicone and let it dry overnight before using them. I force the silicone into the bottom edges to the block also with a small flat screwdriver that fits bewteen the crankshaft flange and the block. I'll try posting a picture of it, hopefully that will help

Posted By: HPMike

Re: Rear main seal kit RB? - 05/31/12 12:15 AM

I wouldn't get too excited about the so called "one piece" rear main seal. The problem isnt usually the parting points of the seal. In many cases its a poor finish of the seal surface on the Chinese stroker cranks. Also, AND THIS IS VERY IMPORTANT. If you are using tne replacement billet seal retainers cut some grooves in the retainer so that the oil can successfully drain back to the pan. If you install them you will see that the retainer winds up "shrouding" the #5 main cap and wont allow the oil to drain quickly back to the sump. The retainer that Best Machine sells is properly relieved to avoid this problem.

Also, the brown/orange "fluoroelastoimer" seal is the one to use. Its pricy at about 25 bucks, but I get no problems with this seal. Also, it should be a common practice by now to have a Chinese crank checked and corrected by a competent crank grinder before putting into use. Also ask the crank guy to check the rms surface. I usually have .005 cut off which tones down the heavy knurl they put into the rms surface.

MB

Posted By: 451Mopar

Re: Rear main seal kit RB? - 06/24/12 04:30 PM

Quote:

I wouldn't get too excited about the so called "one piece" rear main seal. The problem isnt usually the parting points of the seal. In many cases its a poor finish of the seal surface on the Chinese stroker cranks. Also, AND THIS IS VERY IMPORTANT. If you are using tne replacement billet seal retainers cut some grooves in the retainer so that the oil can successfully drain back to the pan. If you install them you will see that the retainer winds up "shrouding" the #5 main cap and wont allow the oil to drain quickly back to the sump. The retainer that Best Machine sells is properly relieved to avoid this problem.

Also, the brown/orange "fluoroelastoimer" seal is the one to use. Its pricy at about 25 bucks, but I get no problems with this seal. Also, it should be a common practice by now to have a Chinese crank checked and corrected by a competent crank grinder before putting into use. Also ask the crank guy to check the rms surface. I usually have .005 cut off which tones down the heavy knurl they put into the rms surface.

MB

I used the orange "fluoroelastoimer" seal and so far it seems to be working well. The side seals take some time to "work" them into place. Use some silicone spray or WD-40 to lube the side seals, then have to raise-lower the seal retainer while pushing the side seals to work them down to the block surface.

Posted By: HPMike

Re: Rear main seal kit RB? - 06/24/12 04:45 PM

Quote:

Quote:

I wouldn't get too excited about the so called "one piece" rear main seal. The problem isnt usually the parting points of the seal. In many cases its a poor finish of the seal surface on the Chinese stroker cranks. Also, AND THIS IS VERY IMPORTANT. If you are using tne replacement billet seal retainers cut some grooves in the retainer so that the oil can successfully drain back to the pan. If you install them you will see that the retainer winds up "shrouding" the #5 main cap and wont allow the oil to drain quickly back to the sump. The retainer that Best Machine sells is properly relieved to avoid this problem.

Also, the brown/orange "fluoroelastoimer" seal is the one to use. Its pricy at about 25 bucks, but I get no problems with this seal. Also, it should be a common practice by now to have a Chinese crank checked and corrected by a competent crank grinder before putting into use. Also ask the crank guy to check the rms surface. I usually have .005 cut off which tones down the heavy knurl they put into the rms surface.

MB

I used the orange "fluoroelastoimer" seal and so far it seems to be working well. The side seals take some time to "work" them into place. Use some silicone spray or WD-40 to lube the side seals, then have to raise-lower the seal retainer while pushing the side seals to work them down to the block surface.

Glad that worked

Its the only one I use at this point...

MB

Posted By: moparlifer

Re: Rear main seal kit RB? - 06/24/12 09:22 PM

do you have to cut the crank off to get a one piece seal on a big block??? That Hughs is an intervator!