So many different options on rear main seals
#2295962
04/29/17 10:02 AM
04/29/17 10:02 AM
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Joined: Jun 2016
Posts: 63 Florida
1930
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Joined: Jun 2016
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Florida
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Getting ready to assemble a 440, want to do everything I can to not have any issues with rear main seal, I found a thread on this site where these http://www.dvorakmachine.com/rearmainseal.shtml were recommended but the thread was from 2009. Any better suggestions?
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Re: So many different options on rear main seals
[Re: 1930]
#2296044
04/29/17 12:54 PM
04/29/17 12:54 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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I agree rear main leaks are the cats' ass. I would get the surfaces squeaky clean with brake kleen & some silicone under the seal halves and a drop where the seal halves meet each other & also goop the sticks on the sides before installation & you might offset the seal halves 1/4". & as you know but just a reminder, the seal lip toward the oil. You'll be fine. Others will chime in with more info.
live every 24 hour block of time like it's your last day on earth
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Re: So many different options on rear main seals
[Re: RapidRobert]
#2296055
04/29/17 01:05 PM
04/29/17 01:05 PM
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Joined: Apr 2006
Posts: 3,675 Akron, Ohio U.S.A.
roadhazard
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I agree rear main leaks are the cats' ass. I would get the surfaces squeaky clean with brake kleen & some silicone under the seal halves and a drop where the seal halves meet each other & also goop the sticks on the sides before installation & you might offset the seal halves 1/4". & as you know but just a reminder, the seal lip toward the oil. You'll be fine. Others will chime in with more info. This right here is where the problems start RR.... all kinds of bad info. http://www.manciniracing.com/subheporemas.html
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Re: So many different options on rear main seals
[Re: roadhazard]
#2296056
04/29/17 01:07 PM
04/29/17 01:07 PM
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Joined: Jan 2003
Posts: 10,931 North Dakota
6PakBee
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I don't understand your point. Please elaborate.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: So many different options on rear main seals
[Re: 6PakBee]
#2296065
04/29/17 01:23 PM
04/29/17 01:23 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Me too, I was wondering if my posted info was off. EDIT After rereading it sure sounds like he is saying some or all of my info is off. I can say that that plan has worked for me in the past but if something is off or borderline off let me (us) know & I have a 451 in the works & I too want it right (no leaks).
Last edited by RapidRobert; 04/29/17 01:30 PM.
live every 24 hour block of time like it's your last day on earth
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Re: So many different options on rear main seals
[Re: 6PakBee]
#2296071
04/29/17 01:31 PM
04/29/17 01:31 PM
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Joined: Apr 2006
Posts: 3,675 Akron, Ohio U.S.A.
roadhazard
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I don't understand your point. Please elaborate. You start putting sillycone on the rear main seal and you have already lost the battle. Never, EVER use that stuff on a rear main seal. The very first consideration BEFORE a rear main seal goes in is dimensions of the seal groove, it must be on size and Round. Secondly the rear seal retainer should be aligned with the groove in the block and a reference mark scribed on the pan rail surface for assembly. Alignment of the two seal halves is critical. 3rd, check the crank for dimension and surface finish. Knurling on some of the aftermarket cranks is way to aggressive from what I have seen. Never had an issue with a stock crank, knurled or not. The point is, do your due diligence BEFORE slapping a seal in and slathering it with sillycone. I posted a link for a seal that I have intimate knowledge on for nearly 30 years. If it leaks.... it won't be the seal.
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Re: So many different options on rear main seals
[Re: Sxrxrnr]
#2296077
04/29/17 01:38 PM
04/29/17 01:38 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Alright, on my 451 I will not use silicone.
live every 24 hour block of time like it's your last day on earth
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Re: So many different options on rear main seals
[Re: 71birdJ68]
#2296085
04/29/17 01:48 PM
04/29/17 01:48 PM
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Joined: Apr 2006
Posts: 3,675 Akron, Ohio U.S.A.
roadhazard
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Just wondering out loud, but why doesn't someone come up with a one pice seal like we put in the nose if airplane engines. You stretch it around the flag and then glue into the case, and they don't leak. My best educated guess is the flange on the back of the crank is to large compared to the seal I.D. and stretching a Polyacrylate or Fluoroelastomer (Viton) seal much if at all would prove very difficult IMO. Not to mention the damage that can occur to the seal dragging it across the flange.
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Re: So many different options on rear main seals
[Re: 71birdJ68]
#2296116
04/29/17 02:48 PM
04/29/17 02:48 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
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Just wondering out loud, but why doesn't someone come up with a one pice seal like we put in the nose if airplane engines. You stretch it around the flag and then glue into the case, and they don't leak. They do make a one-piece seal but it's not intended to stretch over the flange although I don't see why you couldn't considering that all SAE prop flanges are larger than the Mopar. http://www.fastfishautoparts.com/Performance-Engine-Seals.html
The INTERNET, the MISinformation superhighway
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Re: So many different options on rear main seals
[Re: John_Kunkel]
#2296126
04/29/17 03:08 PM
04/29/17 03:08 PM
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Joined: Jan 2003
Posts: 10,931 North Dakota
6PakBee
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I Live Here
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North Dakota
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Just wondering out loud, but why doesn't someone come up with a one pice seal like we put in the nose if airplane engines. You stretch it around the flag and then glue into the case, and they don't leak. They do make a one-piece seal but it's not intended to stretch over the flange although I don't see why you couldn't considering that all SAE prop flanges are larger than the Mopar. http://www.fastfishautoparts.com/Performance-Engine-Seals.html Wow! That would be worth buying just to try it. John, where do you dig this minutia up?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: So many different options on rear main seals
[Re: roadhazard]
#2296168
04/29/17 05:56 PM
04/29/17 05:56 PM
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Joined: Feb 2012
Posts: 4,479 Morristown Tn.
71birdJ68
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Airplane crank flings are much larger than car flanges. There is a special tool to stretch, and walk it on with. What we do is warm up the seal, and unhook the spring ends, then walk it over the flange. After a little while it shrinks back to size, we hook the spring back together and using contact cement push it into its place in the case. Sometime we take a razor, and slice it to get it around the flange. Just wondering if this could be considered.
Last edited by 71birdJ68; 04/29/17 05:59 PM.
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Re: So many different options on rear main seals
[Re: 1930]
#2297210
05/01/17 03:50 PM
05/01/17 03:50 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
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I use the stock Mopar or Fel Pro rear main seal kits with "Adhesive Sealant" type gasket maker on the front label, not any other type I use a small dab on the mating ends of both seal and the seal holder and follow the directions on the instruction sheet for the side seals and then wait 24 hrs. for the mineral spirits to soak in and run off. I use a small thin bladed screw driver to use the adhesive sealant to fill and seal up the V joint between the rear main seal holder and the block flush with both sides on both sides as well as the bottom of the seal holder to the block DO NOT use regular automotive silicone gasket maker for this Adhesive Sealant type only!
Last edited by Cab_Burge; 05/01/17 03:51 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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