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Old November 15th, 2013, 01:57 PM   #1
creeping death
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Question proper vacuum psi to the 4WD actuator?

anybody know what the proper vacuum psi to the 4WD actuator should be?

i checked both sides at the plug for the actuator and also upstream on both lines going to it close to the transfer case where the hoses plug into the steel lines on the cross member and i'm getting 15 psi @ idle at all four places i checked.

does this sound about right?
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Old November 15th, 2013, 02:23 PM   #2
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15 psi of pressure or vacuum? 15 psi of vacuum is not possible.
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Old November 15th, 2013, 02:42 PM   #3
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no u need vacuum to engage the front 10+ inches of mercury for it to work. are you sure the collar is not fucked up of stuck
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Old November 15th, 2013, 03:24 PM   #4
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it reads 15 inch vacuum.

using my vacuum gauge to troubleshoot and was just curious what is normal. there was a hole in the housing of the actuator causing it not to engage into 4WD
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Last edited by creeping death; November 15th, 2013 at 04:18 PM.
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Old March 22nd, 2014, 01:10 PM   #5
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The shift fork slide can get gummed up and not allow the fork to slide, there isn't much vacuum that goes down to the actuator. Thats why the stock setup isnt very good. I went with the posi-lok setup and havent looked back, but if you are getting vacuum at the axle then that shouldnt be your issue. Pull the housing, clean it, check for wear on the splines and collar, slide the fork by hand after you clean it to make sure its sliding smoothly. Also, what kind of hole in the housing? As in something hit it and put a hole in it? There should be a breather hose that comes off of it, then the tubes for the vacuum lines, should be the only holes.
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