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Old 08-17-2010, 09:57 AM   #1
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Gear Oil Leak

My rear diff is leaking oil, I'm not too sure where from. The oil is being faned onto the bottom of the jeep's body leaving oil droplets and onto the muffler, I't smells like burnt gear oil. My problem is, I can't find the leak, the seal is dry, a little dirty but no oil leaking through it, no oil puddle on my garage floor. It seems it only leaks when the shaft is spinning, where from? Has anybody had a similar problem? How did you correct it? Please let me know, it's driving me insane. Laters,

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Old 08-17-2010, 02:22 PM   #2
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Nobody out there seen anything like this? I will try to snap some pics tonight.

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Old 08-17-2010, 02:33 PM   #3
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Sounds like a leaky pinion seal to me.
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Old 08-17-2010, 02:46 PM   #4
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Is the rear axle's vent hose in place on the barbed hose fitting at the top of the brake line splitter box? That combination brakeline splitter/vent hose connector box is located on top of the axle.
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Old 08-17-2010, 04:48 PM   #5
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Yes, that is in the right place.
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Old 08-17-2010, 04:50 PM   #6
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Quote:
Originally Posted by RednekYJ View Post
Sounds like a leaky pinion seal to me.
That's what I thought at first, but the area around the seal and the pinion is dry. I don't comprehend the issue. Maybe the Wrangler god is mad at me for not wheeling often.
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Old 08-17-2010, 05:31 PM   #7
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What's the slipyoke look like?
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Old 08-17-2010, 10:31 PM   #8
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Attachment 23197

Attachment 23199

Attachment 23200

Attachment 23201

Attached are some photos I took of the leaky mess under my jeep. Note the oil seal is a little wet but nothing dripping. I looked closely and it might be that it only leaks when the shaft is spinning, and doesn't collect any oil on it. What do you think, please scrutinize the images let me know what you think. Thank you. Laters,
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Old 08-17-2010, 10:39 PM   #9
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Looks like a mildly weepy pinion shaft seal to me. Fortunately you can change one in an hour with no special tools.
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Old 08-18-2010, 09:57 AM   #10
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Looks like a mildly weepy pinion shaft seal to me. Fortunately you can change one in an hour with no special tools.
Thanks for the help. How difficult is it to replace? I'm good with tools, I just have never replaced one of these before. Laters,
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Old 08-18-2010, 10:42 AM   #11
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It's not difficult, especially after you've done your first pinion seal replacement. Get the yoke off, pull the old seal out and carefully tap a new seal into place. Getting the old seal out is often the most difficult part without a seal puller. I simply cut into the old seal and start pulling it apart like peeling an orange until it pulls out. Getting the new seal properly seated takes a bit of careful soft tapping until it is seated all the way around into the seal opening and then it is just pushed down evenly all the way around until it hits bottom. Wipe a bit of RTV around the edge of the seal first.

Be careful not to score/scratch the seal seating surface with tools you use to get the old seal out. I had never done one until 7-8 years ago and without anyone to show me how to do it, it went fine.
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Old 08-18-2010, 11:29 AM   #12
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Very cool, I will attempt to replace in a few days, I will take pictures and post as soon as completed. Thank you guys for the help. Laters,

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