Duramax Diesels Forum Truck of the Week
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Old 02-17-2018, 09:01 PM
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frankenstien frankenstien is offline
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Default Front output shaft seal leak issue

My front output shaft seal started leaking on my Transfer case about a week ago, figured out it was the front output seal, no big cleaned it up, ordered a seal from Merchant Auto, swapped seals was good for a day ish, here i am a week later and its leaking again. The seal from June only lasted 7 months

I used the special seal installer tool i also got from MA . Not sure what the deal is, it is a 2 piece seal, I am thinking maybe i installed it too far? maybe its rubbing too hard on the seal surfaces? see the pic, you can see the old line

I have checked the vent to make sure its clear, checked transmission fluid level, it is exactly where i left it, just at the "H" in HOT at 175F, T case fluid is about 1/4'' below the fill hole

Thought I would see if anyone had any ideas before i just put another seal in it.

History-I rebuilt the transfer case in June of 2017, new bearing and seal kit from a local driveline shop, also had new rear output bushing replaced and currently has regular vavoline Dex3 in it(same as trans)
Attached Images
File Type: jpg side t case.jpg (134.6 KB, 34 views)
File Type: jpg 20180217_182954.jpg (176.9 KB, 36 views)
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Old 02-17-2018, 11:50 PM
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Does the output shaft have a groove worn in to it from the old seal? If so, you'll need to split it apart and put a new shaft in, or see if you can install a new seal far enough in or out of normal to avoid the groove.

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Old 02-18-2018, 12:19 AM
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Quote:
Originally Posted by DAVe3283 View Post
Does the output shaft have a groove worn in to it from the old seal? If so, you'll need to split it apart and put a new shaft in, or see if you can install a new seal far enough in or out of normal to avoid the groove.

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I didn't see any grooves when I installed the new seal, and it didn't appear that the metal sleeve on the inner part of the seal had spun, as it was fairly hard to get off the shaft.

When I pull this seal out I'll double check again for grooves.
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Old 02-18-2018, 12:30 AM
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Hopefully you just got a bum seal. I ended up going through 3 rear axle seals before one actually held for more than a couple months.

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Old 02-18-2018, 12:55 AM
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Quote:
Originally Posted by DAVe3283 View Post
Hopefully you just got a bum seal. I ended up going through 3 rear axle seals before one actually held for more than a couple months.

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No good, I hope not, I'm going to try and get a GM seal this time
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Old 02-18-2018, 06:55 PM
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Did you put a little oil or grease on the seal and shaft last time Mike?
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Old 02-18-2018, 07:56 PM
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Take some fine emery paper and polish up the shaft. Get rid of any rust, burs or imperfections. Then lube it up well before putting the new seal in
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Old 02-18-2018, 09:12 PM
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Quote:
Originally Posted by Burn Down View Post
Did you put a little oil or grease on the seal and shaft last time Mike?
I didn't, I'm guessing I should have?

Would that cause it to leak between the mating surface of the inner and outer part of the seal?
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Old 02-18-2018, 09:35 PM
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It can cause the seal surface to burn and degrade over time. Always lube a lip seal before installing.

If it’s leaking from the bore of the t-case and the outer edge of the seal, it sounds like the bore is damaged or has debris in it. Clean with some scotch brite and brake clean. Put a thin layer of rtv or liquid Teflon sealant on the outside surface of the seal before you install it.

You need to use care when installing it as well. Find a socket that is just smaller than outside of the seal or a piece of pipe. Lots of guys distort the seal trying to use a hammer by itself.
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Old 02-18-2018, 10:31 PM
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Quote:
Originally Posted by Burn Down View Post
It can cause the seal surface to burn and degrade over time. Always lube a lip seal before installing.

If it’s leaking from the bore of the t-case and the outer edge of the seal, it sounds like the bore is damaged or has debris in it. Clean with some scotch brite and brake clean. Put a thin layer of rtv or liquid Teflon sealant on the outside surface of the seal before you install it.

You need to use care when installing it as well. Find a socket that is just smaller than outside of the seal or a piece of pipe. Lots of guys distort the seal trying to use a hammer by itself.
I cleaned out where the seal presses into the case it self and wiped everything down after I drained the T case. the seal had grease applied to the inner and outer lips when i took it out of the bag, but i didn't add any to it

i think i am not understanding something or mis communicating something.


in the pic looking straight on at the output shaft the gold ring and the black portion where they mate and it is leaking from, ill see if i can get a better pic

the seal I installed has a metal ring that is "pressed" on to the input shaft itself, the outer portion of the seal is pressed into the transfer case it self. so the center part of the seal spins while the outer part of the seal stays in place pressed into the case

also added a pic to show the metal ring inside
Attached Images
File Type: jpg oil seal.jpg (18.7 KB, 12 views)
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Last edited by frankenstien; 02-18-2018 at 10:53 PM.
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Old 02-18-2018, 10:54 PM
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It came with a wear sleeve then. If it had grease on it that is enough. Sounds like you got a bad seal Mike.
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Old 02-18-2018, 11:04 PM
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I hope so, i'd like to not pull my Transfer case again. This is my first go round with a seal like this

thanks for the help, hopefully youngs has a seal in stock
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Old 02-18-2018, 11:05 PM
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I’d try a gm one like you mentioned.
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Old 02-18-2018, 11:08 PM
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I am going to call the dealership in the morning, see what they say, i couldnt find a gm part number on any of the larger gm parts sites, gmpartsdirect, partszoneonline etc, not sure what the deal there is
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ATP EFI Live Fass 150 big cat filter
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Leveled 295/75/16 Toyo's
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Old 02-19-2018, 06:24 AM
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Iíve had the same problem with 2 different transfer cases now. Both with seals from Merchant auto, and using the merchant install tool. After reading this I think the tool is made wrong and pushing the inner portion of the seal in to far causing it to wear against itself.


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