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Unread 12-06-2010, 11:41 AM   #1
dukie564
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1995 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hanover, MD, Maryland
Posts: 2,691
How to: extending the rear diff vent

This is my version of extending the vent tube for the rear axle.

There are a few guides around that say they put the end/filter inside the gas tank filler area - this a very "ghetto" IMO, and i didn't want to stare at it every time i opened the cap to fill my gas tank, and thought it might cause issues when it came time for the emissions gas cap pressure test...so i came up with a different solution.

I'm a big fan of hidden/reversible modifications (see my cowl snorkel mod for example My version of a cowl snorkle - Jeep Cherokee Forum), and i wanted this to be completely hidden, but very functional. I couldn't vent the axle inside the vehicle to keep from having to smell heavy gear oil every time i jumped in the jeep.

So this is what i ended up doing:

Parts list:
10 feet of 5/16" clear pvc tube ($5.60 for 10 feet at Home Depot)
1 hose clamp ($0.56)
1 F20011 Fuel filter ($4.11 at AA)

I would have preferred going for fuel line, but at $1.39/foot, i couldn't justify the cost over the HD tubing. I have about 6ft left over if it ever breaks/cracks.

In searching for a suitable place to mount the filter/tube outlet, i happened to consider the area around the taillights. When i took one off i gasped at the amount of space in the body behind the light, as well as in the light housing itself. Perfect! It's out of the way and hidden, and it's plenty high to avoid ever being dunked underwater.

Drilled a hole:



Attached the new tube to the axle with the hose clamp, ran it over some tubes and behind the gas tank support rod, and up over the tank to the filler area, and drilled a hole through the frame rail to pass the tube through. Secured with a wire clip.



Ran the tube though a rubber drain plug and up behind the light. Attached the filter and an extension tube to the top to run through the hole. I later trimmed the extension tube to about 3" past the hole, and bent the end down to fit in the void in the taillight housing.



So there it is - keeps water out, vents the axle, and is completely hidden from view. Hope this helps others considering this mod.

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4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 12-06-2010, 11:46 AM   #2
99Greenmachine
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: North Carolina
Posts: 2,980
Nice...may try this myself!
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Unread 12-06-2010, 11:56 AM   #3
XJH-007
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Location: Morrison, Colorado
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LOL, boy.....some people have WAY TOO much time.

I advise replacing that Vinyl line with rubber, Vinyl won't stand up to Gear Oil/vapor/temp changes for long FYI.

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Unread 12-06-2010, 12:00 PM   #4
dukie564
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1995 XJ Cherokee 
 
Join Date: Jun 2008
Location: Hanover, MD, Maryland
Posts: 2,691
not too much time....just stock ride height and a wheeling spot with lots of deep mud lakes. My stock rear vent location is on the framerail, about 6" above the top of the axle. Not good when water sometimes is over my rear bumper. I think this is a cheap simple alternative to changing the gear oil after every wheeling trip.

Also it's not vinyl tube, it's pvc - and unlike vinyl it will resist gear oil / temp changes just fine. Since it's under the truck i don't have to worry about UV rays damaging it, so i'm sure it'll be fine.
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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