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Rear Main Seal Sealant?

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Old 09-22-2016, 08:55 PM
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Question Rear Main Seal Sealant?

All videos and threads say to put sealant on the ends of the seal.
Paper with seal specifically says dont do that.
What to do?


Old 09-22-2016, 09:32 PM
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Follow the instructions, apply a small amount of sealant to the cap or block.
Old 09-23-2016, 04:05 PM
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Originally Posted by Turbo X_J
Follow the instructions, apply a small amount of sealant to the cap or block.
Why does everyone else say put it on the ends of the seal and how would putting sealant there actually seal?
Old 09-23-2016, 04:48 PM
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Originally Posted by SouthSeaPirate
Why does everyone else say put it on the ends of the seal and how would putting sealant there actually seal?
it wouldn't.. does it recommend pushing the seal past matting surface? so the gap is actually not at same place the cap and block mate.. ? Kinda like this picture.. not a jeep block.. but you can see the seal is not at same place matting surface is..

Last edited by Hommersimpson; 09-23-2016 at 04:51 PM.
Old 09-23-2016, 05:02 PM
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Originally Posted by Hommersimpson
it wouldn't.. does it recommend pushing the seal past matting surface? so the gap is actually not at same place the cap and block mate.. ? Kinda like this picture.. not a jeep block.. but you can see the seal is not at same place matting surface is..

Took me a minute to figure out what you were talking about.


Matting vs. mating.
Old 09-23-2016, 09:04 PM
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Originally Posted by Hommersimpson



it wouldn't.. does it recommend pushing the seal past matting surface? so the gap is actually not at same place the cap and block mate.. ? Kinda like this picture.. not a jeep block.. but you can see the seal is not at same place matting surface is..
Only what you see in the picture.
I was referencing Haynes, Chiltions, write-ups, and a few videos. Only this paper strangely goes out of its way to say otherwise

Also, it has the tabs, so it couldnt overlap anyway.
Old 09-28-2016, 08:14 PM
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Still not sure what to do here
Old 09-28-2016, 08:51 PM
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Originally Posted by SouthSeaPirate
Still not sure what to do here
ok .. where the two surfaces meet on the block.. those have to be perfectly clean.. anything in between there would give you a gap and bearing failure.. now.. the ends of the caps where the arrow is pointing.. on the OUTSIDE so to say there is a gap between block and cap.. you can put a bead of sealant in that gap.. it must be 100% clean tho.. no oil residue

NOW on the picture i posted.. you see the seal in the block and the cap? even tho its not a jeep engine see how the seal is not flush with the matting surface? it is down 1/2 in and sticking out a half inch on other end? that is to put the mating surfaces of the two seals, the upper and lower seal.. in a spot that is not flush with the matting surface of the block and cap so it does not leak..it is easy to do..
Old 09-28-2016, 08:53 PM
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and make sure you got lip on seal going the right way or it will leak so bad you will not even put it in gear..it will pour out
Old 09-28-2016, 08:59 PM
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Old 09-28-2016, 09:14 PM
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Thanks for the help!
Ill have to take a pic for you tomorrow and show that is not possible. There are tabs in the seal that sit in the cap. So the other half will not go into the block.
Old 09-28-2016, 09:29 PM
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Looks like you have the newer gasket and should follow these instructions. Make sure you have the correct seal with the two tabs that stick off the lower part of the seal
https://www.cherokeeforum.com/f2/rea...-4-0-a-227737/
Old 09-28-2016, 09:33 PM
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Originally Posted by SouthSeaPirate
Thanks for the help!
Ill have to take a pic for you tomorrow and show that is not possible. There are tabs in the seal that sit in the cap. So the other half will not go into the block.
no need.. i know what seal you are talking about..
Old 09-28-2016, 10:24 PM
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I know going to links is a pain, but right here on-top it's mentioned different years are different. (Homer, some of us have "ears" that don't allow the off-set you mention). > https://www.cherokeeforum.com/f2/rea...-4-0-a-227737/

Last edited by DFlintstone; 09-28-2016 at 10:55 PM.
Old 09-29-2016, 03:37 PM
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So after reading your post, I now have a different concern.
If it's that easy to scratch, I probably did so on the crank

Am I screwed now?


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