TC has a leak, i think. Help!!!

straty1987 · 04-12-2010, 06:57 PM

ok i have a 02 GC limited with a 247 transfer case and i think i have a leak coming form the rear axle output on the TC

i was cleaning the jeep and just looked underneath to see if anything was dirt and if i should hose it down and i noticed some oil or grease on the TC. so i touched it and not not like fresh oil since it has dirt on it put when i touched the end part of the TC with a towel it look like fresh oil.

if it dose not rain tomorrow i an going to try and clean it up with break clean and see if i can get a better idea of were its coming from.
Dose any advice on what it could be and what parts i need to fix it?

**ZJPunk98** · 04-12-2010, 07:12 PM

This is very easy to fix. You can get most of the seals at a local auto store. if you are only leaking your rear seal, just replace that one.

Things you will need: new rear seal, seal puller or equivalent tool, snap ring pliers, 13mm (i think)socket and driver, flat head srew drivers or pry bar, and RTV sealer.

Remove rear drive shaft: unbolt from rear axel and pull out of TC. This is a slip yoke. Slides in and out.

Open rear access panel on the output shaft: usually two screws.

Inside here you will see a snap ring, you will need to spread this in a few minutes.

next remove bolts retaining the rear output to the main tc body. in addition to the bolts the rear output cover is held on my some strong RTV, you will need to loosen the cover using a pry bar. there are two points on the cover designed to use the pry bar with.

once the cover is loose, you will need to use your pair of snap ring pliers to spread the snap ring through the access panel. Just spread it enough to pull the cover off. Just wiggle the cover a little when you spread the ring and the cover will come off. You will need to spread this ring to put the cover back on. The ring is seated in the cover, you do not need to worry about loosing it.

remove the seal, install the new one and reverse the steps. When you put the cover back on, you will need to spread a nice even layer of RTV on the cover prior to bolting it back into place. This prevents the tC from leaking between the covers.

I have pics on my build thread. take a look.

CrazyIvan888 · 04-12-2010, 07:13 PM

My first guess would be a rear output seal, which as far as I know is pretty easy to fix.

But there are a couple discrepancies. First of all, the transfer case shouldn't be filled with motor oil, which is what your leak looks like.

Also, it appears that the leak is streaming back from the top of the t-case, suggesting the possibility that it's somehow being blown all the way back from the engine. Yeah, I know that sounds dumb, and it may not be possible, but it certainly looks like engine oil to me.

Do you know if you're losing engine oil?

**Virmagicus** · 04-12-2010, 07:25 PM

With that leak all you have to do is look directly above on the bottom of the unibody ... i bet theres a wet spot.

**ZJPunk98** · 04-12-2010, 07:26 PM

Quote:

Originally Posted by Virmagicus

With that leak all you have to do is look directly above on the bottom of the unibody ... i bet theres a wet spot.

if that is engine oil, Virmagicus is probably right.

**Virmagicus** · 04-12-2010, 07:31 PM

Just because it's dark does not mean it's motor oil... it appears to be leaking @ the TC.

CrazyIvan888 · 04-12-2010, 07:40 PM

True, but it doesn't look like the rear TC seal to me. If you look at the last pic which is a sort of side-view, the wetness looks like it's coming from the top forward part of the TC somewhere.

Unless some kind of weird airstream pattern or something is pushing it up there from the seal.

straty1987 · 04-12-2010, 09:18 PM

thanks all for the input, if you want to see more photos look here tc leak pictures by straty19897 - Photobucket IDK if it will help get a better idea but its worth posting.

i am going to clean it with break clean and see if i can get a better idea on if its the seal on the TC or rear output seal.

straty1987 · 04-12-2010, 09:18 PM

Thanks ZJPunk98 for all the input i will take a look at your build thread and see if i have any more question on the how to.

but estame how long should this take to complete?

Quote:

Originally Posted by CrazyIvan888

My first guess would be a rear output seal, which as far as I know is pretty easy to fix.
But there are a couple discrepancies. First of all, the transfer case shouldn't be filled with motor oil, which is what your leak looks like.
Also, it appears that the leak is streaming back from the top of the t-case, suggesting the possibility that it's somehow being blown all the way back from the engine. Yeah, I know that sounds dumb, and it may not be possible, but it certainly looks like engine oil to me.
Do you know if you're losing engine oil?

i dont think i have motor oil in my TC, since i am the only one that has serviced it. just think dirt caught onto the leaking oil.

anything is possible by my oil is fine on the dipstick and my jeep is not driving funny.
take a look at the other photos i have posted

Quote:

Originally Posted by Virmagicus

With that leak all you have to do is look directly above on the bottom of the unibody ... i bet theres a wet spot.

what do you mean by wet spot?

straty1987 · 04-12-2010, 09:28 PM

Thanks ZJPunk98 for all the input i will take a look at your build thread and see if i have any more question on the how to.

but estame how long should this take to complete?

Quote:

Originally Posted by CrazyIvan888

My first guess would be a rear output seal, which as far as I know is pretty easy to fix.
But there are a couple discrepancies. First of all, the transfer case shouldn't be filled with motor oil, which is what your leak looks like.
Also, it appears that the leak is streaming back from the top of the t-case, suggesting the possibility that it's somehow being blown all the way back from the engine. Yeah, I know that sounds dumb, and it may not be possible, but it certainly looks like engine oil to me.
Do you know if you're losing engine oil?

i dont think i have motor oil in my TC, since i am the only one that has serviced it. just think dirt caught onto the leaking oil.

anything is possible by my oil is fine on the dipstick and my jeep is not driving funny.
take a look at the other photos i have posted

Quote:

Originally Posted by Virmagicus

With that leak all you have to do is look directly above on the bottom of the unibody ... i bet theres a wet spot.

what do you mean by wet spot?

WJV8QD · 04-12-2010, 10:57 PM

I agree, that looks like engine oil and the last pic tells the tale. Look at the residue pattern, its coming from somewhere up front and dripping down the TC. I have seen seal leaks, my mustang's T3650 leaks a bit from the rear seal and the pattern is totally different, its not above the seal at all, just around it and on the slip yoke a tiny bit.

**ZJPunk98** · 04-13-2010, 08:47 PM

any luck?

10char

straty1987 · 04-13-2010, 10:55 PM

i did not get a chance to get under their today.
i should have time on Wednesday to put it up on my ramps and get to clean it good and see if its coming from another spot other then the TC.

i came across this TSB http://wjjeeps.com/tsb/tsb_wj_2101101.pdf so going to look around the top

WJV8QD · 04-14-2010, 02:54 PM

Ya know, judging from DC's diagram, it could very well be that seal if its that far inside and looks like it has some kind of window of which to seep out of on top of the tail. So, looks like a winner.

straty1987 · 04-15-2010, 05:47 PM

ok so i when under and looked at it closer. also took some more photos, which i added to the link i i posted above. TSB has nothing to do with as far as i can tell for now.

its not coming from anywhere else other then the TC since their is no oil on the TC before the part of fill plug. also when i patted the are a with paper towel it did not look like fresh fluid. could it be just grease on the output shaft?

also noticed something similar on the rear of my front diff (Dana 30) axial, it looks like grease on it but not fluid, or old fluid with dirt. photos below

photos before cleaning the TC

after i used some break clean on the TC and a bit of a wipe down

This is what the back of my Dana 30 looks like connection the axial going to the TC. looks similar no fresh oil, no puddle. looks like grease

any ideas or comments for the on form my TC and the one by the Dana 30?

one guy said its nothing big and as long as i am not making puddles under my jeep to just live with it. since he has done it twice and has came back both times.

Thanks allot