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-   -   Transfer Case Leak (http://www.wranglerforum.com/f282/transfer-case-leak-55415.html)

drivebytruckerz 07-15-2010 12:55 PM

Transfer Case Leak
 
My transfer case (at least that's where the fluid is ending up to drip) started leaking this week. It's not pouring, but it's wet all over my skid plate. Is replacing the seals a job that I could/should take on myself? I'm not a mechanical idiot.. I mean I've replaced water pumps, radiators, brakes, manifold gaskets... but is the tc something that you need to know what you're doing?

Just wanted to see what everybody thinks. It's a daily driver, so if I screw anything up I'm out of a ride.

drivebytruckerz 07-15-2010 01:25 PM

Thanks for the input guys.. mechanic it is.

30-284 07-15-2010 06:05 PM

One thing you might check before you take it to a mechanic is the speedometer drive, it has an o-ring seal and is known to leak as mine did the same thing. When I replaced the o-ring, which is about a 5 min. job, the leak stopped completely.

Donn

drivebytruckerz 07-15-2010 10:36 PM

Quote:

Originally Posted by 30-284 (Post 689631)
One thing you might check before you take it to a mechanic is the speedometer drive, it has an o-ring seal and is known to leak as mine did the same thing. When I replaced the o-ring, which is about a 5 min. job, the leak stopped completely.

Donn

Thanks bud. I literally JUST crawled under it for a closer look with a flashlight. I couldn't see every angle because I didn't take the skid plate off or jack it up, but it's dry on rear side with the drain/fill holes. It's wet on most of the front (transmission) side though. Not so much a drip, more of a heavy seep. The whole skid plate is wet, but hardly any makes it to the ground.

onseytote 07-31-2010 12:36 AM

If it's your first time I think it'll be better to let someone who knows fix it for ya.

Ken Steele 07-31-2010 02:12 AM

I can't remember, but I'm pretty sure there is no seal other than RTV between the tranny and transfer case. Do you have an automatic or manual? Check your fluid levels to find out if it is your transmission or transfer case leaking. Don't be intimidated by the transfer case if you find that it is where the leak is coming from. It is a pretty easy piece to rebuild and repair. Your biggest problem will be identifying the leak.

onseytote 09-24-2010 04:19 PM

Quote:

Originally Posted by Ken Steele (Post 707361)
I can't remember, but I'm pretty sure there is no seal other than RTV between the tranny and transfer case. Do you have an automatic or manual? Check your fluid levels to find out if it is your transmission or transfer case leaking. Don't be intimidated by the transfer case if you find that it is where the leak is coming from. It is a pretty easy piece to rebuild and repair. Your biggest problem will be identifying the leak.

I got it fixed finally just bought a new one from here transfer cases

DerekM 09-24-2010 04:24 PM

there is no seal on the case, it is just rtv. I did mine last year, it took about 6 hours but i just took it out and resealed the case with high temp RTV and it still works beautifully. I consider myself average and i did it with a Haynes manual its not too bad.

Mine is at 231j

Jerry Bransford 09-24-2010 04:32 PM

There is no gasket, RTV, or or any other type of case sealer used between the engine and transmission, or between the transmission and transfer case. Sealing the lubricants inside the transfer case and transmission is taken care of by seals around their input and output shafts.

What model year TJ and type of transmission do you have Drivebytruckerz?

DerekM 09-24-2010 04:42 PM

But I guess you need to find exactly where its leaking, you might not need to crack the case at all if its leaking at tranny/t-case area.

Jerry Bransford 09-24-2010 05:47 PM

If he would tell us what transmission he has, it'd be easy to tell which one is leaking if he has the manual transmission.

This is why I wish Wrangler Forum would push people to fill out their vehicle Profiles so it'd be easier to diagnose programs.

bigwave 04-16-2012 09:22 AM

Same problem just started AX -15 5-Manual
 
I realize this is an old thread but, my 1997 TJ 4.0 5-spd just started leaking a few drops of tansfercase fluid, it's dripping off of front of skid plate. I'm going to drop the skid plate in a day or so but, where should I start looking? I'm pretty handy but, is this a job a guy can do from his back with a good floor jack and some jack stands? I've had the skid plate off a few times and have had to go down that road a few times. I've got a 2.5" lift and 31" tires so I have some room to work under it.

DevilDogDoc 04-16-2012 10:09 AM

Front input seal is a likely candidate. Pull the case set it on the bench, go to town!

ipleadda2nd 04-16-2012 12:42 PM

I just fixed my tranny/tcase leak. Turned out to be the output seal of my tranny. I replaced it and the tcase input seal while I was at it. Not to bad of a job.

Since you know the leak is coming from the tcase you are further ahead than I was. If the leak is coming from between the tranny and tcase it would be the tcase input seal that needs replacement.

If this is the case you need a new seal and RTV. You need the RTV to reattach the seal retainer to the tcase. My 2001 Wrangler I6 3 speed auto used tcase input seal National/Timken 3173. I had a repair sleeve (National/Timken KWK99193) incase I had a deep grove worn into the input gear shaft. AutoZone has them.

Again, this is for my year (2001), tranny (32rh) and tcase (231).

All I used was a jack and 1 jack stand (for tranny). Using a jack you will want to drop the tranny enough to get to the topmost 2 nuts holding the tcase to tranny. My tranny needed some fluid drained otherwise it would have spilled all over the floor right after pulling the tcase. The tcase's input shaft is what actually rides on the tranny output seal (it will make sense once you see it). I'm not sure if manuals need some fluid drained or not.

Also, I used the smaller tranny jack at Harbor Freight to get the tcase down and guide it in when assembling. Worked awesome since I have no friends that will help.

Transmission Jack - 450 Lb. Capacity

bigwave 04-16-2012 05:34 PM

Sounds good, I'm going to probably drop the skid plate tonight and take a good look to see where it's coming from. Just looking through everything it looks pretty dry, but there are a few drops a night and it smells like gear oil. The top of the skid plate has some oil on it also. Thanks felows.

bcpaddler 04-16-2012 05:48 PM

Quote:

Originally Posted by 30-284 (Post 689631)
One thing you might check before you take it to a mechanic is the speedometer drive, it has an o-ring seal and is known to leak as mine did the same thing. When I replaced the o-ring, which is about a 5 min. job, the leak stopped completely.

Donn

I just changed mine this weekend for the same reason. Very easy to do. One bolt - it's out, replace the o-ring, and one bolt and its back in. Boom you're done :thumb:

ipleadda2nd 04-16-2012 06:34 PM

Quote:

Originally Posted by bigwave (Post 2266108)
Sounds good, I'm going to probably drop the skid plate tonight and take a good look to see where it's coming from. Just looking through everything it looks pretty dry, but there are a few drops a night and it smells like gear oil. The top of the skid plate has some oil on it also. Thanks felows.

Gear oil? The tcase takes ATF (red color). A manual tranny would take gear oil. If it's gear oil the leak is from the tranny.

bigwave 04-16-2012 11:30 PM

Yes it's from the trany
 
Quote:

Originally Posted by ipleadda2nd (Post 2266405)
Gear oil? The tcase takes ATF (red color). A manual tranny would take gear oil. If it's gear oil the leak is from the tranny.

I may have been using them interchangably but it's from the trany, not the transfer case and it's definately clean gear oil, no mistaking that smell, it's nice and clean because I just changed it about 7 months ago. At first I thought it might have been from one of my "don't give a sh!t what I spill" kids putting oil in mower because it was so clean. But I can see it on the skid plate and where it's been leaking from.

bigwave 04-17-2012 11:35 AM

Leak
 
Also the trany does not leak if the jeep has not been driven recenlty, when it's just setting in the garage, even for several days I have not leaking. Apparantly it requires the oil to be circulated around to reach the point of leaking or for the metal to expand from the heat? Any input on this would be great.

Wordgie 05-09-2013 05:27 PM

OK, Threadsurrection here, but it beats starting a new one.

I've had my '99 in twice to replace seals and it's still leaking.

On the first time, I had been to a quick lube place and had them do a T-Case service. They said the fluid was low so they filled it with something other than AT4 4 because it was a clearish brown color when it leaked all over the driveway the driveway overnight.

Good news: leak diagnosed as T-case.

I took it to a local trans shop with a great reputation. They replaced the output shaft seals (front and rear) as well as the input shaft seal. A couple days go by and it's leaking in the same general location. I go back after Jeep Beach and they they now diagnose it as a trans leak at a couple of seals and change them. Over the past two years I've had about 4 seals, plus the trans pan gasket, changed.

Couple days later leak from the same general location.

I'm still leaning toward T-Case since the trans fluid is up to level.

I can't get all the way up there, but it appears to be coming from where the case and tranny meet so I'm thinking input shaft seal...again. Could it be install error or is there something else to look at?

Jerry Bransford 05-09-2013 05:29 PM

Check for a nicked or cut o-ring between the transfer case and speedometer gear housing.

Wordgie 05-09-2013 08:38 PM

I've checked that, but I'm gonna check it again. I'm almost positive it's coming from the connection between both units and I'm really thinking they either didn't get the seal seated right or nicked it as they were assembling it.

Jerry Bransford 05-09-2013 08:45 PM

I had a leak from a nicked speedo gear housing o-ring & I chased that leak for weeks, thinking it was coming from anywhere but there. There should be no leak even if the transfer case is unbolted from the transmission, both are sealed internally, they are not sealed where they are bolted together. :)

Wordgie 05-09-2013 08:53 PM

Quote:

Originally Posted by Jerry Bransford (Post 3738946)
I had a leak from a nicked speedo gear housing o-ring & I chased that leak for weeks, thinking it was coming from anywhere but there. There should be no leak even if the transfer case is unbolted from the transmission, both are sealed internally, they are not sealed where they are bolted together. :)

But there's a seal in the tranny and the case, individually. I'm thinking it's the seal in the case that's giving me problems. It appears to be up in that region.

I need to change my speedo gear anyway.


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