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Unread 04-30-2015, 11:56 AM   #1
Yano_Aldar
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1990 YJ Wrangler 
 
Join Date: Mar 2015
Location: SPRINGFIELD, OR
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Vacuum disconnect switch issue

While replacing the axle seal last weekend, I determined that my vacuum axle disconnect is not working properly.

In 2wd, I have vacuum to the "disconnect" side of the vacuum motor.
Same when I move the t-case to 4wd, or any other position.

Vacuum motor works when vacuum is applied to either side.

Vacuum lines to the vacuum motor hold vacuum.

It appears to me that the vacuum switch is not switching, but otherwise works. Is this switch mechanically activated? How does it work?

I'm thinking I'll replace the vacuum switch, but before I do that, I'd like to know if there is a way to test the switch itself.

Can the switch be cleaned?

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Unread 04-30-2015, 02:52 PM   #2
JGRIM
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The vacuum switch on the transfer case has a ball tip that rides on a cam on the shift plate. I had one freeze up and exhibit the same behavior you are seeing. They are not too difficult to remove and check for free motion. Jerry
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Unread 04-30-2015, 05:20 PM   #3
Drednot
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Quote:
Originally Posted by JGRIM View Post
The vacuum switch on the transfer case has a ball tip that rides on a cam on the shift plate. I had one freeze up and exhibit the same behavior you are seeing. They are not too difficult to remove and check for free motion. Jerry
Yeah, it is dead simple. Just unscrew it and you will see. If cleaning it doesnt fix it, you can usually find a NOS mopar part cheap on ebay. Last time I looked, I found one for $11
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Unread 05-02-2015, 08:01 PM   #4
Yano_Aldar
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Alright, I'll do that when I get home. Thank you!
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Unread 05-02-2015, 09:38 PM   #5
Anticanman
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I have a spare I found in the shop. It works.
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Listen to what the canman says. You don't have to take it all word for word. But at least listen to the man. He knows his ****. Its a no BS straight to the point realistic approach to things. You may not like it. But someday you might have an Anticanman moment. Like you just had. I know I have. Hell I had 2 last week.
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Unread 05-03-2015, 11:37 AM   #6
Yano_Aldar
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1990 YJ Wrangler 
 
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Location: SPRINGFIELD, OR
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So... Does anyone know the correct socket size for that switch? It's a bit harder to get to than I thought. I saw someone mention 13/16ths, but I'd like to know for sure before buying it.
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Unread 05-03-2015, 12:32 PM   #7
Anticanman
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1 1/16" end wrench. Try something short so you can swing it around under the jeep or you can take it out and do it on the bench.
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Quote:
Originally Posted by rambo3489 View Post
Listen to what the canman says. You don't have to take it all word for word. But at least listen to the man. He knows his ****. Its a no BS straight to the point realistic approach to things. You may not like it. But someday you might have an Anticanman moment. Like you just had. I know I have. Hell I had 2 last week.
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