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Unread 09-02-2013, 07:02 PM   #1
FleXJ96
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Pinion seal constantly blowing after d30 locker install

I have done a few lunch boxes in Dana 30s before, so no big deal right? well wrong....

Only had the Jeep a few weeks before getting the locker, and noticed a small pinion leak , figured just old seal. When I pulled the cover almost no fluid came out. So I installed the spartan and bolted it all back up. I noticed it was puking oil out the pin bad, figured I just over filled. Had a buddy that is a tech at a shop replace seal for me just so I don;t mess up. Drove few miles home and seal is blown. Figured it was a fluke, replace with a Timken this time, maybe it was a cheap national seal before. first turn of Drive shaft it blew again. Now i'm stumped. Any one heard anything like this before? My buddy that helped with seal wants to pull pinion and carrier and redo it all . I'm just so frustrated right now.

Here is both of the new seals just a few miles on them . Any help or thoughts would greatly be appreciated. That and if anyone has a timken part number for the pinion seal to make sure I got the right one.



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Unread 09-02-2013, 07:26 PM   #2
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Your vent is clogged.
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Unread 09-02-2013, 08:01 PM   #3
FleXJ96
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Quote:
Your vent is clogged.
That was my first thought as well and I will pull and check tomorrow. My concern is the guy that did the seals mentioned the yolk was hard to put back on and he had a good feeling it would destroy the seal again like it did without even thinking of the vent ...
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Unread 09-02-2013, 08:51 PM   #4
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If the vent isn't clogged, then I would think, the seal couldn't blow out, but could be ripped out by a damaged,"Yoke." If it turned out to not be the vent, then check the yoke for a deep groove, or a gouge bad enough to catch the seal.
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Unread 09-03-2013, 11:18 AM   #5
CJ7-Tim
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A worn, damaged, or rusted yoke will tear up a seal fast.
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Unread 09-03-2013, 12:33 PM   #6
Timo_90xj
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Bad yoke or clogged vent tube. Vent tube would most likely not tear the lip of the seal like that though, only puke diff fluid out. So my bets are on a bad yoke.

Have you checked there is no play in the pinion bearings?
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Unread 09-03-2013, 08:18 PM   #7
FleXJ96
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Come to find out it was the wrong yolk, and the guy that did the install just made it fit ... With a hammer . Got a real d30 yolk from a Buddy and issue solved. Not sure what this thing is out of. Same spline but way bigger OD.
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Unread 09-03-2013, 09:15 PM   #8
mcthnif
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Quote:
Originally Posted by FleXJ96 View Post
Come to find out it was the wrong yolk, and the guy that did the install just made it fit ... With a hammer . Got a real d30 yolk from a Buddy and issue solved. Not sure what this thing is out of. Same spline but way bigger OD.
Wow! That is one dangerous mechanic. Sorry You ended up with one like that.
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Unread 09-04-2013, 01:43 AM   #9
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Quote:
Originally Posted by FleXJ96 View Post
Come to find out it was the wrong yolk, and the guy that did the install just made it fit ... With a hammer . Got a real d30 yolk from a Buddy and issue solved. Not sure what this thing is out of. Same spline but way bigger OD.
Good that you found the reason. Having a bigger yoke wouldn't actually have been an issue, had the mechanic also installed a correctly sized pinion seal to match the yoke OD.

Now, just remember a driveshaft attaches to a yoke, yolk is what you find inside eggs
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Unread 09-09-2013, 08:17 PM   #10
FleXJ96
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Hah thanks
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