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Unread 10-28-2013, 01:23 PM   #1
4North
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Why is gear oil coming out of my diff vent?

What could possibly cause the positive pressure to force the oil up the line?
Just changed diff cover to a Blue torch fab. Filled the diff to just under the fill hole with some Royal purple?
Everything looked OK when I had the cover off.
It's worth mentioning that a P.O. or shop cut the tubing about 4 inches off of the top of the axle and zip tied a union into the cut. That's where it's leaking.
Any ideas?

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Unread 10-28-2013, 01:35 PM   #2
brouwmat
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it doesn't make a lot of sense that it would since the hole for that is on the top of the diff.

I guess it could make sense that as the oil is flinging around in there it could get some in the tube on the bottom, and then heat up causing the air inside the diff to expand and force a small amount up the tube (like a bubble in pop coming up a straw and forcing some liquid out). I'm wondering if it's normal and just more obvious here because of the joint and splice.
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Unread 10-28-2013, 01:38 PM   #3
Timbo24
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Most go all the way into the engine bay. I think that because it is short, it has enough pressure to make it out the top. If it was the right length, I would assume that this wouldn't happen.
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Unread 10-28-2013, 02:11 PM   #4
86cj74.2L
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Quote:
Originally Posted by Timbo24
Most go all the way into the engine bay. I think that because it is short, it has enough pressure to make it out the top. If it was the right length, I would assume that this wouldn't happen.
The end of the vent may be plugged. Pull it off and look.
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Unread 10-28-2013, 02:31 PM   #5
MuddyWJ
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Quote:
Originally Posted by 4North View Post
What could possibly cause the positive pressure to force the oil up the line?
Just changed diff cover to a Blue torch fab. Filled the diff to just under the fill hole with some Royal purple?
Everything looked OK when I had the cover off.
It's worth mentioning that a P.O. or shop cut the tubing about 4 inches off of the top of the axle and zip tied a union into the cut. That's where it's leaking.
Any ideas?
How much gear oil did you use in quarts?
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Unread 10-28-2013, 03:09 PM   #6
4North
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1&1/2 I think....did it month or so ago
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Unread 10-28-2013, 03:22 PM   #7
MuddyWJ
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Originally Posted by 4North View Post
1&1/2 I think....did it month or so ago
I know it's off topic but was it the 44a cover? Only reason I ask is because I'm planning on getting that one. My Solid 30 cover took 2 quarts and still isn't to the fill hole.
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Unread 10-28-2013, 06:09 PM   #8
Cirruslydakota
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http://www.wjjeeps.com/tsb/tsb_wj_0300203.pdf
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Unread 10-28-2013, 06:24 PM   #9
4North
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Awesome!!!!! Thanks so much!
Oh and Muddy I think it was 2 and a half quarts
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Unread 10-28-2013, 06:27 PM   #10
Cirruslydakota
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