Rear Diff vent issue - Ford Powerstroke Diesel Forum
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Old 10-13-2013, 01:56 PM
TJM TJM is offline
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Rear Diff vent issue

I have noticed some oil leaking out of my rear diff from the main seal and also from the gasket on the cover. I know the gasket is good, not sure how the seal is. But I have read a lot of posts about the vent being clogged, so I figured I would start there and go from there. So I get under the truck and with the deep well socket I started to twist the vent, the piece on the rear axle with the two brake lines going into it. As I twisted, the when unit began to turn, including brake lines. Now I wasn't sure if this was supposed to happen so with hope of the vent just being rusted on there I sprayed it down with PB blaster. That didn't work. So my question is, how do you get this damn vent out without snapping or having to take the brake lines out? Or do I have no choice and have to take the brake lines out? Any help will be much appreciated!
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Old 10-13-2013, 02:26 PM
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Hold the brake line Tee with a crescent wrench or channel locks.

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Old 10-13-2013, 03:00 PM
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Curious how you "know" the "gasket" is good... There is no gasket, its RVT...
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Old 10-13-2013, 03:09 PM
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No need to unscrew anything. Pull the hose and put a 3/16" drill bit into the vent(dont drop it) if it goes in, then the vent is open.


And what CSIPSD said. how do you know the gasket is good? When they leak, they are bad
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Old 10-13-2013, 05:34 PM
TJM TJM is offline
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I'll try the drill bit and if that doesn't work I'll do the channel locks. And the gasket on mine right now is an actually gasket, not rtv. And I've read when the vent is clogged the pressure pushes the oil to the weakest point, possibly being my gasket. I have a new gasket and cover but wanted to see if the vent will help.
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Old 10-14-2013, 09:59 AM
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If you have a venting problem, it will probably leak at the ends of the axle as well. Not always, but likely.
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Old 10-14-2013, 10:05 AM
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I drive on some pretty crappy roads which always seem to plug off the OEM differential vent and after being a slow learner and replacing axle seals twice I ran a length of nice purdy stainless steel braided hose from the spot that the OEM vent was to a regular old style CCV filter I mounted inside my boxed in frame. No more axle seal issues.


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