complete a/c to oba write up.... tons of *PICS* - JeepForum.com
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post #1 of 21 Old 09-18-2005, 12:28 PM Thread Starter
hockey10588
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complete a/c to oba write up.... tons of *PICS*

here is a complete and full a/c to oba write up! this is was done a 1990 cherokee with the stock sanded compressor. the a/c on my 90 XJ wasnt up to full speed when I bought it from its second owner. when I started reading up on to convert your stock a/c compressor to an oba compressor I though this was an awesome idea. I gathered most of the info on how to do this from various sites, this one should be able to get you up and airing for about $150 (less an air tank).

parts needed: (these are the exact parts I used but anyother combination of fittings etc.... should work) Home Depot had the lowest prices but I got some stuff at the local mom and pop store.

2- 3/4 90* brass fittings ($5 each), 3/4 to 1/2 reducer ($3 each), 1/2 pipe 3/8 hose barb ($1.20 each)

Husky air/fuel filter to go after compressor output ($20)


Husky mini air regulator (manifold $20), supplied gauge with regulator, 1/4 pipe 3/8 hose quick male disconnect ($1.50), 1/8 to 1/4 increaser$.70), 3-way 1/4 tee ($3), 1/4 safety valve rated at 150 psi ($10), 1/4 pipe 3/8 hose barb ($1.20)

Grainger pressure switch rated to come on at 95 psi and off at 125 psi ($17)


8 feet of 12 ga wire ($2), 3" male-male extender ($.90), brass 1/4 cap ($.90), 3-way nylon 3/8 barb tee ($1.50), 1/4 pipe 3/8 hose nylon barb ($1)


this is basically everything needed besides basic handtools and some mechanic knowledge

25 foot coil air hose ($15), quick connect fittings and air blower ($6), lawn mower air filter (currently not using)
4 feet of air hose ($3), various hose clamps

everything stock but about to change into OBA!


INSTALL
once you picked everything up you can start to tear into your jeep! BUT WAIT... make sure that your system is depressurized by a shop before you continue to undo any lines etc.... for my install I took everything out of the front of the engine bay.
1) start with the battery and battery tray and remove the coolant return bottle because you have 2 relocate it next to the air filter.

2) now you can tear into the a/c system removing all the lines, the freon canister, and the a/c condenser. it's alot easier if you remove the radiator so then you can just lift the a/c condenser out without disconnecting the lines.




90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA

Last edited by hockey10588; 12-06-2005 at 04:48 PM.
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post #2 of 21 Old 09-18-2005, 12:51 PM
kent l
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How do you lubricate the compressor to keep it from locking up from heat build up?
The concept looks great in an area that you do not need air.

White 1990 XJ 3 inch lift 31 inch BFG's on AR 767's
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post #3 of 21 Old 09-18-2005, 12:53 PM Thread Starter
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with all the fittings off and hoses out of the way you can start to install the oba components.
3) screw on the 3/4 90* fittings onto the compressors output/input and remember that TONS of teflon tape is your friend! I even used some blue RTV gasket maker to really make sure that it was sealed because everything after the output is under pressure.


4) for the air/oil filter I got 2 metal elbows and screwed them into the fender with self-tapping screws. used 2 zip ties and secure the filter to the elbows.

cut the correct length of airhose and slide it onto the barb and secure with clamps


5) install the pressure switch onto the manifold and wire it up. I got 14 ga wire and 1 side goes to the ground and the other is connected to the positive battery cable (I am goin to install a switch to interupt the power from the battery to the pressure switch so it's not always on)


6) now for the intake I didnt want to shell out $40+ for an air tool oiler so I made this tee so I can drop some oil in and seal it off so the compressor is getting air only through the intake


I ziptied the oil intake up so that the oil doesnt drip out of the air intake and goes into the compressor


7) here is the coolant bottle moved next to the air filter. I think you have to have a cone intake in order to move it because there isnt enough room with the stock airbox


8) the manifold with the pressure switch kind of mocked into place. I used the same elbows and zipties to hold the manifold in place and it actually fits very nicely tucked in there.


here is everything all together and ready to blow air! I havent installed the switch yet so the battery wire isnt hooked up but ill get pics up as soon as I do that.

close up

I swapped the quick air male connect on the manifold to a female because it was more logical and thats how most compressors are set up.

thats about it and it works prefectly. you will more that likely run into some leaks but there easy fixes. if you want to run airtools you're gunna have to get an air tank and plum it into the manifold and run airhose to the tank. if you guys need anymore pics just let me kno

Here's my Jeep just to show you guys that a 17 year old on a lawn mowers budget can still have a pretty sick XJ!!

90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA

Last edited by hockey10588; 12-06-2005 at 04:56 PM.
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post #4 of 21 Old 09-18-2005, 12:55 PM Thread Starter
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sorry I was finishing the post when u replied but most the answers are there but if you have any more questions just let me know and ill try and to answer them the best I can.

90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA
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post #5 of 21 Old 09-24-2005, 08:21 AM
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Ok, while this is good, how did you hook up the wiring to the AC compressor? AC compressors are not always on. Can you go into a bit more detail on the wiring side of it?

-Chris B.
1990 Talon TSi AWD - Needs MANY Parts
1987 Jeep Wagoneer 4.0, 31's, 3.5" Superlift
1997 Nissan Sentra
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post #6 of 21 Old 09-24-2005, 01:27 PM Thread Starter
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i got 14 ga wire and stripped the end and attached that to the positive battery cable and ran that into the cab through the firewall. that wire goes to a switch and the other terminal of the switch you run an outgoing wire to the pressure switch. thats the power to the pressure switch. in the pressure switch you run a wire out to both of the stock wires that are already on the a/c compessor. i just cut it and fused the two together. its really easy

90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA
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post #7 of 21 Old 09-24-2005, 11:08 PM
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I'm iffy on the hose and connector setup working long term with a compressor. We constantly fought that style connector at the shop I used to work at...PITA. My bigger concern is your "oiler". That should be used as a testing only method, as it's not getting nearly the oil it needs. You want a 3-5 drops going into that bad boy every second or so....Spend the few bucks to get an inline oiler.

2000 WJ Limited 4.7 QD
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post #8 of 21 Old 11-23-2005, 12:51 AM
devile
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someone needs to do this with pics... not saying it's bad or anything, i just think tech sticky's are better with pics...

Wait, it says with tons of pics, but i don't see any...

98' XJ Sport 4.0, Unknown Lift, Bushwackers, 33X12.5R15, AW4, NP231
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post #9 of 21 Old 11-23-2005, 01:04 AM
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Ya pics didn't work for me either.

My DD
'89 XJ Limited
204,XXX miles
Leather, Loaded

4L Selec-trac
Automatic
3"-4.5"ish Homebrew lift
16x8 MB Motoring Rockers
265/75R16(31ish"X10.4") Goodyear Wrangler M/TRs
Trimmed w/ Bushwackers
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sans big audio
Homebrew intake w/cone filter
"Some people are like a slinky... Not really good for anything, but you still can't help but smile when you see one tumble down the stairs." :my dad
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post #10 of 21 Old 11-23-2005, 01:22 AM
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yea i was wondering about that

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post #11 of 21 Old 11-23-2005, 08:37 AM
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the links need to be updated, this is an old post, bout 2 months old if i recall correctly. PM the starter and im sure he will fix them

1990 Jeep Cherokee Laredo
4.0L
Automatic Tranny
NP242 Transfer case
Dana 30 front, 35 custom rear differentials

Mods:

RE 4.5" Lift
32x11.50 BFGoodRich M/T KM's
American Eagle 058 Polished Aluminum Wheels, 3.63" BS.
Grand Cherokee Rear Disc Brake setup
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Dynomax Super Turbo Muffler.
Surco Roof Rack


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post #12 of 21 Old 11-23-2005, 04:43 PM Thread Starter
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hey sorry about all the pics everyone. ive been away and wasnt aware the pics werent working but ill see what i can do

90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA
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post #13 of 21 Old 12-06-2005, 02:27 PM
devile
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Pics!!!!!!!!!!!!!!!!!!!!

98' XJ Sport 4.0, Unknown Lift, Bushwackers, 33X12.5R15, AW4, NP231
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post #14 of 21 Old 12-06-2005, 04:30 PM Thread Starter
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hey guys sorry about the pics I'm fixing it right now so it shouldnt be too long if everything works.

90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA
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post #15 of 21 Old 12-06-2005, 04:57 PM Thread Starter
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ok all the links should work and I'm not sure why it didnt just put the picture on the thread instead of the pic links but w/e there you guys go

90 XJ AW4 242 d30/d35

4" rustys/RE lift - 33" muds - soft 8's - flexy flares - straight piped - rustys intake - AW4 TCU mod - a/c to OBA
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