Convert FJ62 A/C to OBA

[Spook50]

I used the stock fitting off the compressor and joined the hose using a couple fittings to mate them which was really the hardest part since they tend to want to separate under pressure. Trial and error worked fine. The power wire is also original and I just added a switch under the hood since I open it to attach the hose. I like it that way but I could see some people liking a dash switch. I suggest making sure you can tell it's off because you don't want to forget to turn it off after airing up or whatever.

Since mine (if I can fab up a mount) will have an in-cab switch, I figure I'll just use an indicator light to show when there's power going to the clutch. Planning on mounting an air pressure gauge inside too, along with figuring out a tank system in the back that'll be easy to get to once Kevin finishes designing his 60 series cargo windows

 

[Front Range 4x4]

Sounds like a very workable plan! Keep us posted.

 

[Spook50]

Sounds like a very workable plan! Keep us posted.

The biggest issue I see is fabbing up a bracket and being able to mount the compressor so that the pulley lines up with the where the smog pump's pulley used to be. With any luck I'd be able to use the exact same belt as well. If I can get that sorted, the rest of the install should be pretty cut n' dry.

 

[GLTHFJ60]

Chris, does your compressor have enough power to run air tools, like an impact gun? I finally picked one up and my co2 tank won't run it at full power. On top of that, the impact uses a lot of air which means more annoying refills. I bet an air tank with the compressor would help a ton when using air tools.

 

[Front Range 4x4]

I've never tried any Johnny but I doubt it would be happy trying. That may be where a good supplemental tank would come in. If I wanted that ability I'd use a separate compressor that wouldn't require the truck to be running. The Yota compressor puts out around 125psi and I'd think air tools require more than that especially running for a long time.

 

[GLTHFJ60]

My particular gun only needs 90-120 psi but they need a lot of flow, something like 5 scfm. Oh well, I guess I'll find out!

 

[Front Range 4x4]

Yeah, be sure to post what you find, if it works for you I may just pick up some air tools.

 

[StevoJonesFJ60]

Air tools?

I figured I would bump this to see if anyone is running air tools off the stock ac compressor. I'm thinking about doing this mod, but I would like the convenience of running air tools on board.

 

[GLTHFJ60]

I figured I would bump this to see if anyone is running air tools off the stock ac compressor. I'm thinking about doing this mod, but I would like the convenience of running air tools on board.

No because I'm lazy and have just been using my Co2 tank. I've gotta unload it then I'll be forced to work on this project, .

If the stock compressor puts out 125psi then with a big enough air tank, this setup should be able to run my 600# impact gun pretty easily.

 

[StevoJonesFJ60]

Well I'm gonna go ahead and get some OBA with the stock pump, hopefully this week, I'll let you know how it works out.

 

[GLTHFJ60]

Well I'm gonna go ahead and get some OBA with the stock pump, hopefully this week, I'll let you know how it works out.

Definitely post up when you're done!!

 

[rover67]

Throw an air tank on there and you should be fine. I have no idea what the output of the stock compressor is vs. the York, but my york moves plenty to work an air wrench with small tanks. I have even used it tankless with an air gun to blow loose grout out of bricks and it worked OK.

 

[StevoJonesFJ60]

Hey, there is just one thing i'm unsure of about this and its really simple I bet. For wiring power, you just took a wire from positive on the battery, put it to a switch and connected the original power wire off the compressor to the switch?

 

[GLTHFJ60]

Hey, there is just one thing i'm unsure of about this and its really simple I bet. For wiring power, you just took a wire from positive on the battery, put it to a switch and connected the original power wire off the compressor to the switch?

If you're talking about the pressure switch, I can only imagine it being inline with the stock power that is applied to the AC clutch. Once the switch hits the appropriate pressure, it kills power down the line, disengaging the clutch.

No?

 

[cody c]

For a real air impact gun, that compressor and tank will be on the small side. If you do decide to try it out to be able to run an impact gun, I would suggest the biggest line and fittings you can find between the comp and tank, and tank and impact, and maybe even putting the air chuck on the tank, with the least resistance possible.

I think youll find it works, but youll spend more time waiting for it to build pressure than using it to pull bolts and nuts off. Setting it at high pressure (130ish) would be helpful too.

 

[StevoJonesFJ60]

Ok thanks, I'll keep that in mind. I was gonna run 3/8" pressure lines with a 5 gallon tank. I mostly want to have the on board air for airing up the tires so depending on how it runs the air tools I might throw in a smaller tank or just remove the tanks... Also Does anyone happen to know the fitting sizes used to connect to the stock ac compressor? I've got a 1987 fj60.

 

[rover67]

I would recommend running the power to the clutch from some sort of switched source. the clutch on the compressors does a REALLY good job of draining the battery to nothing if it is left on accidentally..

 

[StevoJonesFJ60]

Yep, so I hear. Its gonna be run from a toggle switch, to the pressure switch to the clutch. I'll probably throw an LED by it to let me know if I left it on. Anyone know those fitting sizes? I hacked the tubes with a sawzall like an idiot, and now I don't have them to tie into with barbed fittings. Figures the day after I did that I thought of OBA.

 

[GLTHFJ60]

Wait a second, if you are using the stock AC compressor, why not use the stock AC button? Not only will that engage the clutch when you press the button in, but the light will light up and it will send a signal to the AC idle up vacuum switch to rev the motor up. That was a no-brainer for me, why did that option get passed over?

You don't have to wire anything, aside from a pressure switch, should you use the stock compressor control.

 

[StevoJonesFJ60]

That's a really good idea, I wish I thought of that. When I desmogged I took the AC Idle up out because the AC didn't work, but I should still have that somewhere. I guess I'll reinstall that too. I'm headed off to grainger on my lunch break, so if I find out what that fitting size is I'll post up about it. Hopefully I'll have the time to put the OBA in tomorrow night.