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Unread 07-10-2007, 11:54 AM   #1
Hambne
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1991 YJ Wrangler 
 
Join Date: Jul 2006
Location: Saucier, MS
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Transfer case vaccuum case switch

Did a little search to find what im looking but nothing. I just did a sye conversion on my 91 ( np 231 ) and when it was put back together no 4wd. I figure that it was a vaccuum line broke. I has been replaced before i bought it. Im wondering if it is something inside the tc because when I pull into 4wd the front shaft turn. Is that correct. Also when in 2wd Ihave a vaccuum at the vaccuum switch at the axle but when placed into 4wd there is nothing on either vaccuum lines at the axle. Is there something in the tc that pushes on the check valve on the tc vaccuum switch ? I did replace the vaccuum but still had the same problem. Thanks for the help. Derek

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Unread 07-10-2007, 01:43 PM   #2
timatoe
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When you pull the lever for the TC the vac switch is actuated switching the vacuum. While some will say that the connector can't fit on the switch the wrong way, I did do it before. So make sure that the plug is back on right in the "keyed" spot. I would bet that's your problem, especially if it was working before.

Also stand by for everyone to tell you why you should get the posilock.
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Unread 07-10-2007, 04:03 PM   #3
Hambne
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Thanks I made sure that the plug was on right 3 or 4 times but still does the same thing
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Unread 07-10-2007, 08:33 PM   #4
kloppk
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Yes there is something inside the tcase that activates the vacuum switch.

You should have vacuum on the Right side of the axle vacuum motor in 2WD
and vacuum on the Left side of the axle of the vacuum motor in 4WD.

Sounds like you either have a break in the line from the vacuum switch to the Left side of the axle vacuum motor (yellow line) or you have a defective vacuum switch.
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Unread 07-11-2007, 11:51 AM   #5
Hambne
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Does anybody know what activates the switch for it to flop sides
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Unread 07-11-2007, 12:22 PM   #6
Varnish
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The switch in the tcase has a steel ball in the bottom that is pressed on by a cam attached to the shift bar in the tcase.
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Unread 07-11-2007, 01:23 PM   #7
giggityjeeper
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your vacuum motor on your front axle housing is prolly seized, happened to me 3 or 4 times before I swapped it out for posi lok.......the vacuum is there but the fork wont move inside the housing, so it wont ingage the 4x4
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Unread 07-11-2007, 04:36 PM   #8
Hambne
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Thanks guys for the help I want to get to wheel again before I make the trip across the big pond t the sandbox but probably. I know for a fact that the vaccuum is not there in 4wd because i took the vaccuum plug off the vaccuum motor and had vaccuum in 2wd but not 4wd. I think it should be the same amount of vaccuum,right?
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