does anybody have a diagram of the vacuum lines for the front axle? - JeepForum.com
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Unread 09-23-2008, 03:37 PM   #1
bustemduck
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does anybody have a diagram of the vacuum lines for the front axle?

i'm looking for i diagram for the vacuum lines on a 89 wrangler going to the front axle to lock it in.

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Unread 09-23-2008, 03:45 PM   #2
Jim93YJ
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Check out this thread:
http://www.jeepforum.com/forum/showt...diagram&page=2
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93YJ 4.8L Vortec,AX15,Atlas 4.3:1, 4.56 Gears, Dana 30 w/ Posi-lok,Dana 44 Rear w/ Ox Locker + 99 Explorer Disk Brakes,Tom Woods D. Shafts,1" Body, 2.5" ED RE Lift, 33" BFG KM2 T/A's with MT Classic II Wheels, Herculined Inside, Electric Fan, 20 Gal Tank Conversion,Tuffy Center Console,Warn Front Bumper, Rockhard 4X4 Rear Bumper w/ Tire Carrier,Bushwacker Extended Flat Fender Flares,AMSoil/Redline In Everything and the List Goes On....

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88YJ 4.2L: Interior and mechanical overhaul including engine replacement, nutter bypass, Weber 34 Carb, and work on a whole bunch of other things to get it back to fine running condition without the emissions control...evap cannister kept functional as well as PCV system, and manifold heater.
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Unread 09-23-2008, 03:45 PM   #3
Richmond88yj
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Unread 02-04-2011, 05:14 PM   #4
leuenberger4
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is it only the blue vacuum that needs the check valve?
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Unread 02-04-2011, 06:03 PM   #5
kloppk
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.The diagram above only applies to 1987-1990 YJ's (despite it's title)
1991 -1995 used a slightly different setup. 4x4 switch moved from the firewall to the actuator, vac motor went from a 3 hose system to a 2 hose system.
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Unread 02-05-2011, 08:41 AM   #6
leuenberger4
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my jeep is 88 and yeah has 4 vacs from trany where would i start just to check if i got vacuum working? i am a complete noob on this lol all vehicals i had have electric atuator. so here comes some noob questions lol, whats the diff between yj and the tj? ok now that i got that out of the way my atuator had two vacs hooked up but i seen a black one hanging neer it nothing on it, ok ive notice on the actuater that to the passanger out side looked like a vacuum port to it should there be three vacs hooked to it? and the other question is should i be able hand spin that out side atuater that the lines hook to?
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Unread 02-05-2011, 08:44 AM   #7
leuenberger4
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oh yeah and to your reply which i do apreciate, it didnt answer the question about the check valves.
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Unread 02-05-2011, 10:13 AM   #8
GreggVA
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Does the actuator on your axle look like the following:



And the switch on your transfer case look like this:



This would be a vacuum system not an electric system.

The colors and check valves in the diagrams relate directly with the ones in these pictures.

What are you trying to do?
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Unread 02-05-2011, 03:18 PM   #9
leuenberger4
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yes thats exzactly what mine looks like, exept the black one wasnt hooked and the right one isnt atach to any thing just the green and yellow on the two left. so if i can get picks like that where the vacuums should be position in the right spots i can get it figured out. now the actuater or shift motor right where the vaccuum lines hook to, i can hand turn it is that all right or not?
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Unread 02-05-2011, 06:12 PM   #10
steelman10
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Do you mean the vacuum switch on the transfer case?
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Unread 02-05-2011, 09:26 PM   #11
dancytron
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Blue one is a vent. It doesn't have a check valve, it might have a filter/water keep out thing (mine didn't though, it had nothing). Diagram is wrong.

The red one (source of vacuum) for the system has a checkvalve at the top to protect the rest of the vacuum system from leaks in the 4x4 system.

There is a check valve between the lock line (yellow) and line to light switch (black on diagram, mine was white) that vents the line to the light switch when you turn off the 4wd so the light goes off.
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Unread 02-06-2011, 12:18 PM   #12
leuenberger4
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steelman

no the one on the actuater, it turns by hand, but i think i found one issue might be causing no vacuum at all and i think its off the exhaust man, there a crack in it at the bottom in the metal tube. that is what makes the vacuum right? that comes off the catalac?
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Unread 02-09-2011, 06:49 PM   #13
GreggVA
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Any way you could post a picture. The vacuum should come from the intake manifold. The exhaust manifold would have pressure.
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Unread 02-06-2012, 11:11 AM   #14
wranglinman87yj
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where does the vacuum source line attatch

I'm having issues with my 87 doing the same thing. could u post a pic of where the red line attaches? The vacuum source line I mean. pretty please
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Unread 02-06-2012, 12:30 PM   #15
dancytron
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Quote:
Originally Posted by Richmond88yj View Post
This diagram is closer to the 1990 and before, but it doesn't show all the checkvalves. And the blue line has a filter, not a checkvalve.

The correct diagram is
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