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Old 05-16-2011, 02:31 PM   #1
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On Board Air Questions

So after talking about scrapping my AC system someone on here recommended converting it to OBA. So now I am completely hooked on making this project happen but in the midst of doing all of my homework I am coming up with a couple of questions. For a little background and to help get answers, I have a 2000 Sahara package, 4.0L, 5 speed man.

1. Is the factory compressor a Sanden?
2. All of the pics I have been able to see show the compressor on the top part of the engine. Mine is on the lower right side, below the power steering pump. Is this going to be an issue?

Those are the main questions that I have so far. If there is anything else don't worry I will post them here. People on this site have been an amazing help so far. Thanks in advance.

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Old 05-16-2011, 05:39 PM   #2
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Should be a tag on the compressor itself. Ours has one, Sanden, R134, etc.

If you can't see it easily grab a mechanics mirror or swipe the wife's make up compact, use the mirror and a flashlight to see.

I googled the set up, looks pretty straight forward, from the ones I saw.



Kinda like the emergency compressors on our farm tractors. Remove a a spark plug, screw in the air hose to the plug hole, and fire up the engine. Took forever, and not real sure how safe it was, but it worked.

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Old 05-16-2011, 05:49 PM   #3
Knows a couple things...

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Yes all the a/c compressors our TJs came with are indeed Sanden rotary compressors. That yours is mounted lower won't change its ability to become an OBA compressor, it'll just make the process a bit more time consuming since it is harder to access.

The biggest thing to recommend is that you pay close attention to the conversion articles you read where they make recommendations on how to keep the compressor lubricated once it is converted to OBA use. The Sanden compressor is normally lubricated by a lubricant that is added to the refrigerant but that is of course lost when the refrigerant is removed. There are several ways to keep it lubed so just pick the one that you can live with the easiest.

Enjoy the OBA building process and its use after you get it working. I made one out of a York compressor and kept my existing a/c system operational and it was just a great kick-ass system. It could reinflate all four 35x12.50 tires from 7 psi to 25 psi in just under five minutes total, not to mention its ability to run an impact wrench on the trail.

You'll dig it!
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Old 05-16-2011, 05:57 PM   #4
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not real sure how safe it was
Well considering you were pumping a compressed, finely aerosolized mixture of air and diesel through a non grounded polymer hose...
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Old 05-16-2011, 08:29 PM   #5
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Jeep used both Sanden and Mitsubishi compressors. They are almost identical but obviously don't share the same parts. Some are 7 piston, some 9.
The tag on it will tell which it is. Get the number off the tag then Google it. You can get repair parts and exploded views. It's really very simple inside.

Use the Aluminum lines already on it, just cut them where you want.
Run the Lo side to a Tee into the air filter snout for the filtered incoming air.
Get a pressure switch, check valve, gauge, and safety valve from OBA.
On/Off switch and Kwick couplers from anywhere.

You can use an oiler, or do as I do, I just let it suck a small amount of PAG oil every once in awhile, then let it run till it no longer spits out oil.

The critical part for oil on them is in the compressor's crankcase, and that pretty much stays there - on line you'll see how to make a dipstick to check it.

If you use an oil/moisture trap don't recycle it - it puts water back in the system.

It's easy when you use the present AC compressor - no mounting, drive, or where to put it issues.
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Old 05-16-2011, 08:34 PM   #6
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BTW - the spark plug inflaters don't pump the air from the cylinder. They use a piston driven by the compression to pump fresh air. I used one for many years.

But they were a real pain - I always had a burn mark on the back of my hand from bumping the exhaust manifold on my Chevy/Jeep no matter how hard I tried not to.
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Old 05-16-2011, 08:55 PM   #7
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It was always that way, never had a flat when you had a cold engine.

If it wasn't the burn it was the shock when your hand got too close to the spark plug boot, which usually was followed by said burn, when you jerked your hand and hit the manifold.



C.L. ours were even worse, they were gas powered.
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Old 05-16-2011, 11:08 PM   #8
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Quote:
Originally Posted by Jerry Bransford View Post
Yes all the a/c compressors our TJs came with are indeed Sanden rotary compressors. That yours is mounted lower won't change its ability to become an OBA compressor, it'll just make the process a bit more time consuming since it is harder to access.

The biggest thing to recommend is that you pay close attention to the conversion articles you read where they make recommendations on how to keep the compressor lubricated once it is converted to OBA use. The Sanden compressor is normally lubricated by a lubricant that is added to the refrigerant but that is of course lost when the refrigerant is removed. There are several ways to keep it lubed so just pick the one that you can live with the easiest.

Enjoy the OBA building process and its use after you get it working. I made one out of a York compressor and kept my existing a/c system operational and it was just a great kick-ass system. It could reinflate all four 35x12.50 tires from 7 psi to 25 psi in just under five minutes total, not to mention its ability to run an impact wrench on the trail.

You'll dig it!
Jerry, is there room under the hood of our JK's to hook one of these bad boys up??

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