need help with rear seals... Kaase

We are having trouble with the black rear seals leaking. The old rear seals that were red were much better and seemed a little softer. We can no longer find new old stock on the red/brown seals but would like to locate some. A used red one here has a # D2VE-6701-AA, but that number may also be on black ones using the same tooling. Know where there's any? .... Kaase

A few years ago, my machinist (Lewis Robertson at The Shop) showed me an imported BBC crank that had a funky rear seal area. When he spun it in the v blocks and put a dial indicator on the mains, all of the mains were good except for the rear seal area which jumped all over the place. I hope I explained that correctly, it has been a few years.

Jon, what's the part number of the rear seal that seems to leak? Is it the E9AZ or something else?

C9AZ 6701-A NOS . Kinsel Ford in Beaumont ,Tx shows 8 in stock. (800-399-6724).

If you Google that part # C9AZ 6701-A, there are several places that still show them in stock.

I havent had this experience myself but have heard others find that there have been issues with the amount of "crush" induced by the mating (edges) of the seals....... holding the seal away from the crank a tad.... maybe it is something that could be compared with the used red seal you have....If so a quick trim of the end of the seal may be in order....

Just a thought.

Brandon

hookin78 wrote:I... heard others find that there have been issues with the amount of "crush" induced by the mating (edges) of the seals....... holding the seal away from the crank a tad....

Brandon

Agree, exactly what I was getting at/why I started asking part numbers.

Paul

P.s.: Brandon please give me a call after you've dyno'd your latest build.

Cometic list a new rear main seal, Part # C5208. Has anyone tried one yet?

I "believe" Jon Kaase was getting his preferred red/tan rear main seals from PPPC in North Carolina who in turn were getting them from Universal Molded in Wadsworth, OH (Akron suburb). Those seals were Universal Molded part #23460 and the literature said; "Ultra Series" rear main seals were for highly developed racing engines, dry or wet sump, low drag sealing lip, fluoroelastomer rubber, etc. etc.". Anyway the number on the seal said SC 1 then a 43 is on it. These seals are Viton rubber and were phyiscally softer than the black ones. I was buying them 10 sets at a time from Universal Molded and have depleted my stash.

Next step, Universal sold the business and was bought out by U.S. Seal in Detroit, who is also an OEM provider. U.S. Seal has discountinued the red/tan Viton seal because they already had a rear main seal for the BB Ford under part # CS4032P which is the usual black poly seal. It is physically harder than the one Universal Molded used to sell. I have begged and pleaded with Lee at U.S Seal to make the softer Viton seal, however those plans are not anywhere in the near future.

The old company (Universal Molded), marketed their seals under the names Pro Fit Design and Ultra Series, and I believe Jon is asking for help in finding an old stockpile of the red/tan Viton seals.

Charlie Evans

c.evans wrote:I "believe" Jon Kaase was getting his preferred red/tan rear main seals from PPPC in North Carolina who in turn were getting them from Universal Molded in Wadsworth, OH (Akron suburb). Those seals were Universal Molded part #23460 and the literature said; "Ultra Series" rear main seals were for highly developed racing engines, dry or wet sump, low drag sealing lip, fluoroelastomer rubber, etc. etc.". Anyway the number on the seal said SC 1 then a 43 is on it. These seals are Viton rubber and were phyiscally softer than the black ones. I was buying them 10 sets at a time from Universal Molded and have depleted my stash.

Next step, Universal sold the business and was bought out by U.S. Seal in Detroit, who is also an OEM provider. U.S. Seal has discountinued the red/tan Viton seal because they already had a rear main seal for the BB Ford under part # CS4032P which is the usual black poly seal. It is physically harder than the one Universal Molded used to sell. I have begged and pleaded with Lee at U.S Seal to make the softer Viton seal, however those plans are not anywhere in the near future.

The old company (Universal Molded), marketed their seals under the names Pro Fit Design and Ultra Series, and I believe Jon is asking for help in finding an old stockpile of the red/tan Viton seals.

Charlie Evans

Sounds about right ... except that "U.S. Seal" is located in Fort Gratiot, Michigan; (near Port Huron).