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Unread 07-27-2013, 10:11 PM   #1
jeepinbassist
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Rear Main Seal

Anyone know of a good shop to get a rear main seal done for a good price?

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Unread 07-28-2013, 09:38 AM   #2
Mickey_D
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Not sure if you want to try it yourself, but there's always Wrench It Center...
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Unread 07-29-2013, 08:45 AM   #3
Jeeples
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Its a two piece RMS (rear main seal) on your 4.0. Its not terribly difficult to do, the hardest part is dropping the pan, but if you let the front axle hang down (assuming you're not lifted) you should have plenty of room.

A quality oil pan gasket, such at the Fel-Pro Perma-Dry series and teflon/PTFE RMS (also available through Fel-Pro), plus oil change supplies means you should be able to DIY for $100 or less. Depending on how competent you are with a wrench, it should take you 4 hours or less. Most shops would probably quote you in the $400+ range to have this done.
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Unread 07-29-2013, 04:20 PM   #4
jeepinbassist
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Quote:
Originally Posted by Jeeples View Post
Its a two piece RMS (rear main seal) on your 4.0. Its not terribly difficult to do, the hardest part is dropping the pan, but if you let the front axle hang down (assuming you're not lifted) you should have plenty of room.

A quality oil pan gasket, such at the Fel-Pro Perma-Dry series and teflon/PTFE RMS (also available through Fel-Pro), plus oil change supplies means you should be able to DIY for $100 or less. Depending on how competent you are with a wrench, it should take you 4 hours or less. Most shops would probably quote you in the $400+ range to have this done.
I did it, it costed about $50 for the seal the gasket oil and a filter. But I don't think I seated the lower half of the gasket all the way because it's still a bit leaky so I'm going to redo it later.
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Unread 07-29-2013, 10:41 PM   #5
Jeeples
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Originally Posted by jeepinbassist View Post

I did it, it costed about $50 for the seal the gasket oil and a filter. But I don't think I seated the lower half of the gasket all the way because it's still a bit leaky so I'm going to redo it later.
I like to offset the seal against the rear main cap. It usually helps keep some of the leaking at bay.
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Unread 07-29-2013, 10:45 PM   #6
jeepinbassist
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Quote:
Originally Posted by Jeeples View Post

I like to offset the seal against the rear main cap. It usually helps keep some of the leaking at bay.
How do you do that?
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Unread 07-30-2013, 10:08 AM   #7
Jeeples
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Rather then lining up the seal to sit flat with the main cap, offset it by about a 1/4", so one side of the RMS will sit above the main cap when you install it. Obviously you will need to do the same with other half of the seal as well.
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Unread 07-30-2013, 01:11 PM   #8
jeepinbassist
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Quote:
Originally Posted by Jeeples View Post
Rather then lining up the seal to sit flat with the main cap, offset it by about a 1/4", so one side of the RMS will sit above the main cap when you install it. Obviously you will need to do the same with other half of the seal as well.
Oh I see
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Unread 07-31-2013, 12:52 PM   #9
85IrocZ-28
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Quote:
Originally Posted by Jeeples View Post
I like to offset the seal against the rear main cap. It usually helps keep some of the leaking at bay.
I have never had to do this (except when rebuilding an engine), but I like hearing tips like this!
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Unread 08-01-2013, 08:55 AM   #10
Jeeples
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Originally Posted by 85IrocZ-28 View Post
I have never had to do this (except when rebuilding an engine), but I like hearing tips like this!
I've only had to replace a couple of two piece RMS', but it was a tip that got passed on to me at that time. The idea being that you're offsetting the halves of the main cap and the RMS, making it a little more difficult for oil to seep past them.

Both of the two piece RMS' I did this way didn't have any issues with leaking.
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Unread 08-01-2013, 11:08 AM   #11
85IrocZ-28
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It makes perfect sense, I just hadn't ever thought of that.
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Unread 08-01-2013, 01:31 PM   #12
jeepinbassist
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But the upper seal on the 4.0 is different than the lower seal.
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Unread 08-05-2013, 04:56 AM   #13
TJDukit
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Just dab a little RTV on the ends of the RMS and bearing cap and it won't leak.
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Unread 08-05-2013, 07:17 PM   #14
jeepinbassist
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I tried it again this time I cleaned the bearing cap really well put rtv everywhere it said to. It didn't leak till it gets near operating temperature and then it starts to leak.
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Unread 08-06-2013, 08:59 AM   #15
Jeeples
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You're positive it's the RMS that's leaking? I know that on the 4.0's the valve cover gasket can leak near the back and run down the back side of the block, making it look like the RMS is leaking. When was the last time the VC gasket was changed and what type of gasket is it (rubber or cork)?
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