York 210R OBA (On Board Air)

The order of things I wanted to do for my Jeep was beginning with functional/preventative. I started with some armor, and On Board Air was close to follow. I would rather have things I could use all the time and help me make it home, than get things like lockers and ground clearance that would just get my TJ into trouble!

Electrical:

From my auxillary fuse block, I have a +12V fused source go to the Viair pressure switch. The switch has a built in relay, so that’s the same +12V that goes to the serpentine clutch on the York. The switch has connectors for ground, and positive switched source. I mis-interpreted that as needing a positive switched source. It actually GIVES a positive source, and you switch to ground to enable the device. This caused me a little bit of trouble before I had to pull out the trusty multi-meter. The bad part is that I wanted this ignition controlled as well. I needed an ignition switched ground. I wired up a 2-relay gismo (one for switched positive, and one for switched ground) that I installed to solve this problem. Now, under my dash I have a clean switched ground and positive. I don’t have a use for the switched positive yet, but it’s nice to already have it so I don’t piggyback the accessory outlet with anything other than these relays!

OBA Switch Pressure Switch diagram Pressure Switch

Tank:

My tank is mounted below the Jeep, between the frame rails. It’s opposite the muffler. I’ve seen a few write-ups with people mounting it there, and there’s plenty of room! Fit like a charm!

OBA Tank

York:

Preparation – Tapped the rotolock fittings to 1/4″ NPT. The size of the tap is still larger than the 3/8″ NPT hose fittings, so I’m not worried about size and air-flow. Here’s a couple pictures of the fittings, and them tapped.

Standard York Rotolock Adapters Rotolock tapped! Final Rotolock Adapter!

Here’s the york mounted:

Nice Overhead Shot of completed OBA! Looking at the York from above!

Manifold:

My manifold has 2-3/8″ NPT ports (3 really, but 1 is plugged), and 5-1/4″ NPT ports. The two 3/8″ ports come from the york, and go to the tank. The 5 1/4″ ports are as follows:

  • Safety blow-off valve
  • Pressure Gauge
  • Hose to in-cab pressure gauge
  • Hose to pressure switch
  • Plugged (in the future, to another connector in case the tank blows)

Kilby Manifold Kilby Manifold (Diagram) In-Cab Pressure Gauge

Hoses:

My hoses (to and from tank, and everything else) run along the inside of the driver’s side frame-rail along with the brake lines as seen here!

Hoses/Coalescing Filter Hose routing! Hoses from the back

Quick-Connect Connectors:

I have two 1/4″ NPT Industrial quick-connectors. One on the front, and one on the rear.

Front Connector Rear Connector

Overall Schematic:

OBA Shematic

Parts:

  • York 210R
  • Kilby Mounting Plate (K-1550, for ’97 4.0L I6 without a/c)
  • Serpentine Clutch
  • Longer Serpentine Belt (Gates Part #K060935)
  • Intake Filter (1/2″ NPT Male)
  • Coalescing Filter (2-3/8″ NPT Female Ports)
  • Check Valve (3/8″ NPT Female to 3/8″ NPT Male)
  • Manifold (2-3/8″ NPT Ports 5-1/4″ NPT Ports)
  • Safety Valve (1/4″ NPT Male)
  • Gauge (x2) (1-1/8″ NPT Male, 1-1/4″ NPT Male)
  • Pressure Switch (1/8″ NPT Male)
  • In-cab Switch (4x4mods.com part number: RS41P-10 Air)
  • Shut-off Valve (Husky, 2-3/8″ NPT Female Ports)
  • Quick Connects (x3)
  • 1/4″ NPT Male Threaded to 3/8″ Hose barb (x7)
  • 1/8″ NPT Female Threaded to 3/8″ Hose Barb (x2)
  • 3/8″ NPT Male Threaded to 3/8″ Hose Barb (x6)
  • 1/4″ NPT Male Threaded to 1/2″ NPT Male Threaded
  • 1/2″ NPT Coupler (Comes With Kilby’s Intake Filter)