Bizarre Fel Pro Rear Main Seal

Posted By: bobs66440

Bizarre Fel Pro Rear Main Seal - 02/14/12 11:16 PM

I found this in my gasket kit. It says to fill the side seal cavity with RTV, then dip the pipe cleaners in WATER and push them into the cavity?? Has anyone used these before? Seems really odd to me.

Posted By: 471Magnum

Re: Bizarre Fel Pro Rear Main Seal - 02/14/12 11:20 PM

They eliminated the rubber vertical seals and replaced them with RTV. RTV requires water (usually from the air) to cure. The wet pipe cleaners introduce the needed moisture.

I've used a couple of them. They seem to work just fine.

Posted By: 440newport

Re: Bizarre Fel Pro Rear Main Seal - 02/14/12 11:24 PM

Yes, on the 400 I rebuilt a few years ago I used that kit. It seemed really odd to me too, but I followed the instructions and it doesn't leak.

It does looks pretty crappy though and the RTV really gobs outward toward the main cap. Make sure you push the pipe cleaners all the way down too. When I squeezed in all the RTV I could down the side channels, I could still see light coming though near the bottom when I checked with a flashlight. After pushing the pipe cleaners down it seemed to seal. I also RTV'd the retainer to the block from the back as well.

Like I said it works, but is pretty messy.

Posted By: roadhazard

Re: Bizarre Fel Pro Rear Main Seal - 02/15/12 06:40 PM

The silicone and pipe cleaner is hit and miss at best IMHO. Dipping the pipe cleaner in water and inserting it into the cavity is to aid in the curing of the silicone RTV by releasing oxygen within the cavity.

I designed these and have been selling them since about 1991 with excellent success. Just made some dimensional changes in my tooling to make the installation easier for those that don't use them every day or have the motor on the stand.

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Posted By: roadhazard

Re: Bizarre Fel Pro Rear Main Seal - 02/15/12 06:42 PM

A profile view.
The hollow core is for ease of compression

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Posted By: CYACOP

Re: Bizarre Fel Pro Rear Main Seal - 02/15/12 06:50 PM

That whole Felpro Kit Sux. I took the best of care doing my 440 and it leaks a few drops and is all over the trans pan all the time. Mine is probably the seal not the sides though. This topic comes up all the time. Use the rope seal, call Carquest.

Posted By: roadhazard

Re: Bizarre Fel Pro Rear Main Seal - 02/15/12 06:54 PM

Here's a pic of them installed. This is the previous design (different color for identification) Both are very effective. One is just a little easier to install than the other and come with complete instructions

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Posted By: 1MYTGTX

Re: Bizarre Fel Pro Rear Main Seal - 02/16/12 01:09 AM

Wish I knew about these when I rebuilt my 440 a few years ago....had a rear main seal leak immediately after break in.

Decided to change out the stock retainer for the billet aluminum one Mancini Racing sold with the o-ring side seals with engine in the car....STILL leaks

Posted By: bri440

Re: Bizarre Fel Pro Rear Main Seal - 02/17/12 12:50 AM

I bought the same billet seal housing from Mancini. Mine leaked as well. When I took it apart, the problem was clear. When you slide the housing with the side seals into the block, the little rubber seals stretch. Over time, the seals pull back. I had a least 1/4 gap at the bottom of each seal. I had cut them off flush when I installed them. I got new seals (didn't want to spend more money on another housing). This time I added RTV into the grove before I installed the seals. Hopefully this will keep them from pulling back. I also waited a few hours before I trimmed the seals flush, maybe gave the seals some time pull back. From the back of the block I also RTV'ed the seam between the block and the seal housing. I haven't fired it up yet to see if this worked.

Nothing worse than having a re-done car and engine that leaves oil everywhere you park.

Posted By: NachoRT74

Re: Bizarre Fel Pro Rear Main Seal - 02/18/12 05:22 AM

what is what say ppl about Dodge ?

Drips
Oil
Drops
Grease
Everywhere ?LOL

I went with rope and felts? ( or whichever material is ) seals, stock pieces from an Old NOS kit and working great by now.

Of course I helped a little bit FILLING WITH RTV the outside face of seal retainer with block ( the Groove left there )

LOL

Posted By: Big Wedge

Re: Bizarre Fel Pro Rear Main Seal - 02/18/12 02:44 PM

Quote:

Here's a pic of them installed. This is the previous design (different color for identification) Both are very effective. One is just a little easier to install than the other and come with complete instructions

Very nice design. I hope you get your website up soon.

Garth

Posted By: lewtot184

Re: Bizarre Fel Pro Rear Main Seal - 02/18/12 02:47 PM

sure glad i stashed some of the oldies.

Posted By: kdtjb

Re: Bizarre Fel Pro Rear Main Seal - 02/19/12 05:02 PM

Quote:

sure glad i stashed some of the oldies.

Posted By: STROKIE

Re: Bizarre Fel Pro Rear Main Seal - 02/23/12 12:51 AM

Quote:

I bought the same billet seal housing from Mancini. Mine leaked as well. When I took it apart, the problem was clear. When you slide the housing with the side seals into the block, the little rubber seals stretch. Over time, the seals pull back. I had a least 1/4 gap at the bottom of each seal. I had cut them off flush when I installed them. I got new seals (didn't want to spend more money on another housing). This time I added RTV into the grove before I installed the seals. Hopefully this will keep them from pulling back. I also waited a few hours before I trimmed the seals flush, maybe gave the seals some time pull back. From the back of the block I also RTV'ed the seam between the block and the seal housing. I haven't fired it up yet to see if this worked.

Nothing worse than having a re-done car and engine that leaves oil everywhere you park.

I know what you mean...