Re: Rear main seal leaks on B.B.
[Re: fastmark]
#2741984
02/11/20 03:29 PM
02/11/20 03:29 PM
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Joined: Mar 2003
Posts: 1,417 Martinsville, IN
cdwmotorsports
pro stock
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pro stock
Joined: Mar 2003
Posts: 1,417
Martinsville, IN
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I have a block missing one so I’ve been looking at billet ones. 440source has one it’s about $50 for the kit with the bolts. I have not used it and will monitor this.
eBay-cdwmotorsports
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Re: Rear main seal leaks on B.B.
[Re: fastmark]
#2741986
02/11/20 03:31 PM
02/11/20 03:31 PM
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Joined: Mar 2007
Posts: 3,275 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,275
West Coast, USA
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There seems to be a trick to getting them not to leak. There are some great threads in the archives on here about numerous people's struggles to get them leak free.
Hughes sells a billet seal holder too. Superformance sells a nice rear seal kit. Also, keep in mind that the two oil pan bolts that thread into the seal holder are shorter than the rest of the pan bolts. Make sure you pre-fit the ones you are going to use to make sure they don't bottom out in the seal holder.
Last edited by jbc426; 02/11/20 03:32 PM.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Rear main seal leaks on B.B.
[Re: jbc426]
#2741989
02/11/20 03:34 PM
02/11/20 03:34 PM
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Joined: Jan 2003
Posts: 13,319 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
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I've never had any issues using a stock retainer and just offsetting the seal in the cap so the ends of the seal doesn't line up w/ the edge of the retainer. I always use Fel-Pro seals.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Rear main seal leaks on B.B.
[Re: Jerry]
#2742070
02/11/20 08:20 PM
02/11/20 08:20 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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I've used stock rear main seal holders for a lot of years on stock blocks and 1 or 2 on after market blocks with no sealing issues. I have several in stock now from broken blocks. I buy the seals in bulk and the last batch, not sure of the manufacturer, had issues on the depth of the sealing surfaces on a race block, I ended up using some of the older main seals I had and they worked good What showed me the problem was there was no marks from the seal edge on the grease I put on the seal surface as a lube, IE no contact with the crankshaft I now installed the seal holder with no side seals and check the seal contact to the crankshaft before adding the side seals I don't stagger the seals either but I try to remember to use a small dab of adhesive silicone between the seal ends
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Rear main seal leaks on B.B.
[Re: an8sec70cuda]
#2742173
02/12/20 08:37 AM
02/12/20 08:37 AM
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Joined: Nov 2004
Posts: 7,274 s.w.fl
bonefish
master
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master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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I've never had any issues using a stock retainer and just offsetting the seal in the cap so the ends of the seal doesn't line up w/ the edge of the retainer. I always use Fel-Pro seals. This is all ive ever done,even on after market blocks and have had goods results.im no pro by a long shot.
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Re: Rear main seal leaks on B.B.
[Re: Cab_Burge]
#2742198
02/12/20 10:55 AM
02/12/20 10:55 AM
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Joined: Jan 2003
Posts: 6,363 Abilene, Texas
fastmark
OP
master
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OP
master
Joined: Jan 2003
Posts: 6,363
Abilene, Texas
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I've used stock rear main seal holders for a lot of years on stock blocks and 1 or 2 on after market blocks with no sealing issues. I have several in stock now from broken blocks. I buy the seals in bulk and the last batch, not sure of the manufacturer, had issues on the depth of the sealing surfaces on a race block, I ended up using some of the older main seals I had and they worked good What showed me the problem was there was no marks from the seal edge on the grease I put on the seal surface as a lube, IE no contact with the crankshaft I now installed the seal holder with no side seals and check the seal contact to the crankshaft before adding the side seals I don't stagger the seals either but I try to remember to use a small dab of adhesive silicone between the seal ends That’s my experience. I had one SB that I never could fix but that was long ago.
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Re: Rear main seal leaks on B.B.
[Re: fastmark]
#2742201
02/12/20 11:07 AM
02/12/20 11:07 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
master
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master
Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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I used the Mancini RMS kit. No leaks.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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