Re: undersize rear main seal
[Re: darth dillinger]
#3047533
06/02/22 10:44 PM
06/02/22 10:44 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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does anyone make undersize rear main seals for cranks ground undersize on the rear seal journal? if so, then rusted/pitted cranks could be saved. Me thanks you mean oversize rear mail seals so you could grind the seal area down to smooth it up, correct? If so, due you know about the original rope rear main seals that Ma Mopar used forever before switching to the new style neoprene and Viton formed two piece rear main seals? They, the rope type, should work well on a rusted and pitted main seal area as long as the rust is remove and polished down some to make a smooth sealing area for the old style rope seals to seal against
Last edited by Cab_Burge; 06/02/22 10:45 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: undersize rear main seal
[Re: Cab_Burge]
#3047590
06/03/22 10:50 AM
06/03/22 10:50 AM
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Joined: Jan 2010
Posts: 1,440 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,440
NW Chicago suburban area
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there are no under or over size inside diameter rubber seals for any of our SB or BB engines.
As Cab suggested, the early style rope seals would be your best bet. However, be aware that their installation is critical.. and.. the current material is very difficult to cut flush upon installation. The early original material was made with asbestos rope and graphite lubricated... easy to cut. The newer generation (for past 30-40 years) is now made with a Kevlar material and very difficult to cut... takes additional time.. and requires a very sharp serrated cutting blade... but the rope is dominantly replaced by rubber seals.
I'm a former gasket engineer and know the history of this matter.
NOTE: Certain late-model crankshafts can have a press-on metal sleeve installed, however, those designs of cranks cannot have a flange at the end. Similarly, many harmonic balancers have sleeve available to save the balancer and provide a new sealing surface.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: undersize rear main seal
[Re: Mopar Mitch]
#3047604
06/03/22 12:15 PM
06/03/22 12:15 PM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
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I Win
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
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If you go the rope seal route get a BEST GASKET rope seal , the ones that come in the fel pro kits are a pain to work with and keep from leaking . Best Gasket rope seal
running up my post count some more .
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Re: undersize rear main seal
[Re: darth dillinger]
#3047630
06/03/22 01:24 PM
06/03/22 01:24 PM
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Joined: Jun 2004
Posts: 3,365 St. Charles, MO
wingman
Uncreative Title
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Uncreative Title
Joined: Jun 2004
Posts: 3,365
St. Charles, MO
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Doesn't a factory rope seal require the directional "knurl" on the crank to work properly?
If you machine that sealing area smooth won't it leak?
I was always taught rope seal--knurled, lip seal--smooth.
1969 Dodge Coronet Super Bee 383 A4 1970 Plymouth Road Runner 440 FC7 (sold)
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Re: undersize rear main seal
[Re: darth dillinger]
#3047657
06/03/22 02:38 PM
06/03/22 02:38 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,618
Rio Linda, CA
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If using a neoprene seal, shimming the seal cavity in the block and retainer would probably work but the mating ends of the seal would need to be trimmed.
The INTERNET, the MISinformation superhighway
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Re: undersize rear main seal
[Re: darth dillinger]
#3047675
06/03/22 03:28 PM
06/03/22 03:28 PM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,907
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sounds good. where to find a "BEST GASKET" rope seal? thanks. I provided one in my original reply.
running up my post count some more .
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Re: undersize rear main seal
[Re: JohnRR]
#3047701
06/03/22 04:28 PM
06/03/22 04:28 PM
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Joined: May 2019
Posts: 6,174 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,174
nowhere
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sounds good. where to find a "BEST GASKET" rope seal? thanks. I provided one in my original reply. Except you can't buy direct from Best. Here's the link to the distributors page, pick your dealer https://bestgasket.com/distributors/
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Re: undersize rear main seal
[Re: Sniper]
#3048550
06/07/22 10:47 AM
06/07/22 10:47 AM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
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sounds good. where to find a "BEST GASKET" rope seal? thanks. I provided one in my original reply. Except you can't buy direct from Best. Here's the link to the distributors page, pick your dealer https://bestgasket.com/distributors/ Something may have changed since I bought some many years ago , I'm 99% sure I purchased directly from them ?
running up my post count some more .
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Re: undersize rear main seal
[Re: JohnRR]
#3048578
06/07/22 11:46 AM
06/07/22 11:46 AM
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Joined: Jan 2003
Posts: 27,444 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,444
So Cal
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If you’re having the rear main seal area cut down…
Make sure to have the machinist put the knurl back on the surface. And make sure the knurls are going the right direction.
Many aftermarket stroker cranks don’t have the knurl and most seep oil. The stroker cranks that some builders ask to be cut for knurl are much better improvement. SCAT can cut knurl on their cranks for an added fee. They don’t like to and resist it. Just be persistent.
Troy here just built a Hemi with Barton rotating assembly. Guess what? Rear seal area was knurled. And it doesn’t seep oil. The Eagle crank in Troy’s other hemi built 10 years ago leaked immediately. Then a rope seal helped. But not as good as the knurled Barton crank.
Last edited by autoxcuda; 06/07/22 03:04 PM.
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Re: undersize rear main seal
[Re: autoxcuda]
#3048866
06/08/22 11:43 AM
06/08/22 11:43 AM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
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If you’re having the rear main seal area cut down…
Make sure to have the machinist put the knurl back on the surface. And make sure the knurls are going the right direction.
Many aftermarket stroker cranks don’t have the knurl and most seep oil. The stroker cranks that some builders ask to be cut for knurl are much better improvement. SCAT can cut knurl on their cranks for an added fee. They don’t like to and resist it. Just be persistent.
Troy here just built a Hemi with Barton rotating assembly. Guess what? Rear seal area was knurled. And it doesn’t seep oil. The Eagle crank in Troy’s other hemi built 10 years ago leaked immediately. Then a rope seal helped. But not as good as the knurled Barton crank. Good info , I will have to ask around to see if someone can put knurling on my eagle crank here in the northeast.
running up my post count some more .
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