'90 4.2 W/Serp. OBA Build
This is my attempt at a write up for On Board Air for my ’90 4.2 without A/C with a serpentine belt. I haven’t seen any other write ups for this setup.
I picked up a York 209 from a guy on craigslist for $25. I used a lot of different write ups from the net to break it down, clean it up etc. so I’m not gonna get into all that. I used a gasket kit from Napa for the rebuild part# 207120, the kit has gaskets for the 206, 209, & 210.
Stock Bracket on the 4.2 without air and serp. belt.
And without the idler.
I thought I’d be able to fab up my own bracket, but quickly realized it was going to be way more work than I was willing to do. So I called Kilby Enterprises. Then I e-mailed them but I never got a response back from them. They don’t offer a kit for the 4.2 with serp. on their site and apparently don't offer help if you're not gonna drop alot of money. I did find somewhere on their site that showed using an A/C bracket from a CJ. So, I decided they didn’t want my money and called J&W Jeep in Antelope CA. I went down a picked up the bracket for $50. I don’t know if this number would help anyone finding the bracket but it has a cast number of 3237579.
Here’s the bracket as I got it.
I bought a new 6 groove clutch from a seller that sells compressors, cluthes and what not for big rigs on eBay for $61 to the door. Unfortunately I forgot his name and it’s not in my eBay profile because I bought it direct.
On the York I left the incoming line the same as it came.
On the outlet side I cut the nipple off and tapped out the head to ¼” NPT.
Then used a compression fitting and connected a five foot section of copper tubing, that then got ran into the filter and check valve with a leader hose from there into the manifold.
I used a piece of angle iron mounted to the top of the compressor to hold the manifold. I drilled a hole in the back and then attached the leader hose to the back there. The rest of the components are general OBA type stuff.
I pulled all of the original alternator mounting bracketry off and the CJ bracket bolted right up. But I couldn’t get the alternator to bolt up and be able to still move for belt adjustment. So I cut off part of the new bracket, you can see it here.
Once I had the alternator mounted I figured out that none of the stock stuff would go back in and I had no way to hold the alt. in place. I went to Kragen and bought a generic GM alternator bracket Spectre #4226 for $13. It was WAY too long so I cut it down to work for me.
I still had to trim the inner fender just a little to allow enough clearance to tighten the serpentine belt. I ended up using the Goodyear Gatorback #4060760 which is a 76” belt, the stock belt is 81”.
I used ARB type hose to come out of the manifold and through a bulkhead connector into the cab. Then into the 3 gallon tank that I mounted on the rear fender well.
I made a new switch panel that was inspired from one I saw on 12voltguy.com. It’s got a switch for the air and two for winch controls, now I just have to convince the wife I need a winch to go with the switches.:thumbsup:
And a somewhat complete list of parts.
York 209 Compressor $25 Craigslist
Viair Leader Hose $12 Amazon.com
Viair Safety Valve $6 Amazon.com
Manifold 5 port $5 Truckload tool sale
Pressure Switch $13 110/135 airbagit.com
Tank $33 3 gallon airbagit.com
York Gasket Kit $20 Napa
Bracket $50 J & W Jeep
Serp. Belt $32 Kragen
6 Groove Pulley $61 eBay seller
Hose & Push In Fittings $34 Poweraire.com
Alternator Bracket $14 Kragen
3/8” SMC Check Valve $13 waylayedinc.com
3/8” SMC Filter $25 waylayedinc.com
Various Fittings,Bolts, Etc. $50 (roughly) Lowe’s, local hardware store.
That’s pretty much it. Hope it helps someone.
What is the fitting going throught your firewall connected to the blue hose in the fourth to last picture. I'm trying to figure out how to get mine through the firewall also.
I'm 99% sure I used 3/8" hose.
bummer what happened to the pics. I am wanting to do this to my 90 I have an old compressor I bought years ago for another project. it would be perfect for this.
That's a really fancy looking manifold for the price you paid, very cool!
On a side note, Those look like the Rancho shocks that I had on mine. It was a horrrrrrendous ride. I wish I had changed to the Bilstein 5100's much earlier. It looks like your suspension setup is significantly different though, maybe you need that rancho kind of stiffness?
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