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Unread 11-29-2010, 07:46 PM   #1
robert1973
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vent tube? front axle

On the top of my front axle on the housing is a line that runs up into the engine bay. Is that a vent tube? And should it be plugged off at end of tube, Still stock axles on it.

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Unread 11-29-2010, 07:50 PM   #2
Trapshooter
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There should be a filter type device that is white'ish in color inserted in the end of the tube.
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Unread 11-29-2010, 07:50 PM   #3
dadsdream85
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usually there is a small plastic vent at the end of the tube. you can get replacements at the auto parts store, but it should be vented.
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Unread 11-29-2010, 07:51 PM   #4
gojeepin
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It has a valve cap at the end of the line.
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Unread 11-29-2010, 07:52 PM   #5
benullman
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Quote:
Originally Posted by robert1973 View Post
On the top of my front axle on the housing is a line that runs up into the engine bay. Is that a vent tube? And should it be plugged off at end of tube, Still stock axles on it.
yes it is a vent tube, and there should be one on the rear. As others mentioned it should have a white plastic filter-vent. it allows the air out when the gear oil expands in the warmer months.

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Unread 11-29-2010, 07:54 PM   #6
robert1973
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Thanks, just wasn't sure if that was what it was, hopefully the axles will be replaced in few weeks with the 44s i got Was looking through my Haynes manual to no avail as to what it was. Now i know
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Unread 11-29-2010, 07:57 PM   #7
robert1973
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Thanks benullman for the why, answered my next question as to why it would need one. I'm learning though.
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Unread 11-29-2010, 08:14 PM   #8
gojeepin
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You should have three vent tubes; front axle, rear axle, and transfer case.
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 11-29-2010, 08:17 PM   #9
benullman
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Quote:
Originally Posted by gojeepin View Post
You should have three vent tubes; front axle, rear axle, and transfer case.
where is the one for the xfer case? This is a new one for me!

Ben
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Unread 11-29-2010, 08:49 PM   #10
somdfisher
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The transfer case vent is attached to the firewall near the valve cover.

Where does the rear one attach to? I had to put a new tube on it since the old one wasn't there when
I bought it, but I haven't put the rubber hose on yet.
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Unread 11-29-2010, 08:49 PM   #11
gojeepin
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Quote:
Originally Posted by benullman View Post
where is the one for the xfer case? This is a new one for me!
Ben
It should run up the firewall near the battery box.

Quote:
Originally Posted by somdfisher View Post
The transfer case vent is attached to the firewall near the valve cover.
Where does the rear one attach to? I had to put a new tube on it since the old one wasn't there when
I bought it, but I haven't put the rubber hose on yet.
Where it attaches on the axle should be obvious. It runs up behind the passenger-side fenderwell, high enough to keep it from being submerged.
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 11-29-2010, 08:53 PM   #12
somdfisher
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Here's the location on mine

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Unread 03-26-2011, 02:53 PM   #13
NCJ06
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I've just started working on the 82 I just bought and I have a small amount of oil coming from the rear vent tube. This is after probably the longest drive it's seen in a few years- about 100 miles. Should I be concerned? I am planning on changing all fluids over the next few weekends.

Thanks for the help.

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Unread 03-26-2011, 03:25 PM   #14
gojeepin
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Normally the oil doesn't make it all the way to the top of the vent tube. What color and consistency was it?

Sometimes when the oil is contaminated it will "foam" and that can travel up the tube when the differential warms up.

If you're concerned and don't know the condition of the oil, it doesn't take long to pull the cover, drain the oil, clean things up with brake cleaner spray, then reassemble and refill.
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 03-26-2011, 04:35 PM   #15
NCJ06
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PO told me that he had just changed the diff oil but it looks pretty dirty. Consistency was ok I think.

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