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'86 Cherokee won't engage

Old 04-28-2010, 07:05 PM
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Default '86 Cherokee won't engage

Against my better judgment I picked up an '86 Cherokee last week and the 4 wheel drive wont engage. Trying to determine if it's the crappy vacuum actuator, the valve on the transfer case or the transfer case itself. It has the 4 popper 2.5 w/ NP207 transfer case and 5 speed tranny.

How do you know which one? I crawled under and the vacuum actuator on the front axle is really loose and swings around (is that normal), and the vacuum lines pull off easily. When you try putting it in 4 wheel drive, the handle wont even budge.

New to this, I've searched the tech posts from previous and still haven't found the answer. IS a front axle swap the best answer here?
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Old 04-29-2010, 06:01 AM
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Anyone?? I'm sure this topic has been beaten like a dead horse, but I need some help to determine which one to replace.
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Old 07-05-2019, 11:51 AM
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Default '86 Cherokee won't enfafe

Hey there, did you ever sort this out? What did you do, I have much the same issue now with my '86, but the lever works fine and the transfer case linkage underneath is good. Looks like I have no vacuum.
Help Mr Wizard!
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Old 07-05-2019, 03:57 PM
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OK, which transfer case do you have? Full time with console switch or the NP207 part time with lever only?
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Old 07-05-2019, 11:14 PM
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Thanks for your interest. Must be the level model; it has one next to the manual gear shift.
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Old 07-05-2019, 11:16 PM
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Oops I meant LEVER
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Old 07-06-2019, 08:43 AM
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Old 07-06-2019, 08:51 AM
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Well that's a swell idea. What I want though, is to sell the Jeep not modify it. Any other ideas?
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Old 07-06-2019, 09:00 AM
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Originally Posted by JohnOlson View Post
Well that's a swell idea. What I want though, is to sell the Jeep not modify it. Any other ideas?

Yep. Fix all that NLA vacuum crap, spending weeks doing it and figuring it out......

It's obvious you don't understand the benefits of it. carry on.
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Old 07-06-2019, 10:42 AM
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You will have to verify you have vacuum to the front axle when you shift in 4WD. If so, verify the diaphragm does not leak. Usually means a new vacuum motor is needed
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Old 07-06-2019, 11:08 AM
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Originally Posted by 4.3L XJ View Post
You will have to verify you have vacuum to the front axle when you shift in 4WD. If so, verify the diaphragm does not leak. Usually means a new vacuum motor is needed
And in less time than that process takes, you could do the CAD delete and have it listed for sale.
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Old 07-07-2019, 02:07 PM
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I have vacuum under the hood where this plugs in, it is a new transfer vacuum switch. But when I move the lever nothing happens here. I'm stumped...
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Old 07-07-2019, 02:56 PM
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Because there's a rat nest of vacuum hoses that are likely cracked, rotted, severed, oil covered, and otherwise mutilated. They run between the switch you have in your hand and the shifter on the front axle. All of it is totally unnecessary if you just do as I suggested right out of the chute.
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Old 07-11-2019, 02:34 PM
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Cruiser54 I can only guess what your Cherokee looks like but the tubing you describe on mine is none of those things you mentioned. I don't mean to be ungrateful for your advise; I'm not. And I may need to follow your suggestion after all, but so far as I can tell I have some other issue with the front axle. I can actually feel the vacuum where this plug plugs in. Is it en=
ough? I'm not sure...

Hugs, kisses
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Old 07-11-2019, 08:24 PM
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Originally Posted by JohnOlson View Post
Cruiser54 I can only guess what your Cherokee looks like but the tubing you describe on mine is none of those things you mentioned. I don't mean to be ungrateful for your advise; I'm not. And I may need to follow your suggestion after all, but so far as I can tell I have some other issue with the front axle. I can actually feel the vacuum where this plug plugs in. Is it en=
ough? I'm not sure...

Hugs, kisses
Pull that cover off the axle. Does it move with vacuum? Is the fork bent/stuck?

Oh, and while you're there, do the CAD delete........
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