Confidence to Explore

How To - ARB Compressor Under Seat Mount

I should've added OBA a long time ago

If you're adding on board air to your rig in the form of an ARB Dual Compressor, the first question you'll need to answer is where to mount it. I chose to mount mine under the seat, primarily for heat reason. Climbing the mountain passes of Colorado and at elevation makes the engine bay get pretty warm and I wanted to keep the compressor as cool as possible. If that's the route you go as well, the next question is how to mount it. Both Teraflex and Carolina Metal Masters make mounts for under the passenger seat, but they both run around $90. Here is a DIY solution at less than half that cost.

Materials & Supplies

  • 12"x18" sheet of steel, 16 gauge, qty: 1
  • M6-1.00x16mm stainless steel cap screws, qty: 8
  • 1/4 x 1" stainless steel fender washers, qty: 8
  • 1/4" NPT Extended Compressor Tank Drain Valve
  • 1/4" NPT female:female connector
  • Some 1/2" fender washers
  • Dremel tool and cut off bits; hacksaw may be usefull too but not necessary
  • Allen wrench set
  • Drill and drill bits
  • Socket wrench and sockets, including an 18mm socket
  • Torx bit and wrench; the one that came with the Jeep to remove the doors and top works great
  • Black spray paint


Step 1: remove the passenger door

This project will be much easier with the door removed.

Step 2: disconnect the seat

Reach under the passenger seat. You'll see a yellow harness. Pull the red tab toward you, then push in the lock and it'll disconnect. Doesn't take much effort so don't force it.

Step 3: unbolt the seat

Use an 18mm socket and remove all 4 bolts holding the seat to the floor. They're in there really tight so it'll take some effort.

Step 4: remove the seat

Here is how it looks with it out

Step 5: remove the harness mount

Use the torx wrench and bit to remove the piece of metal the harness mount attaches to

Step 6: unbolt the seat mounts from the slides

Six bolts total Here is what it looks like now

Step 8: mark off the excess

Position your sheet metal so it covers 4 of the screws coming out of the slides. Line up the right hand side, then mark the left. We'll cut that extra few inches off. Better to leave yourself too much than too little. I'd do a little wider than I have it shown here Total width for mine was right at 15"

Step 9: cut it

Dremel too, bandsaw, hacksaw or some combination thereof

Step 10: check the fit

Step 11: prep for paint

Place the sheetmetal in its intended position and mark out the 4 holes to be drilled for the four studs it will slide over

Step 12: drill it

Drill clearance holes so the sheet metal can slide over the studs

Step 13: check the fit

NOTE: At this point in the process, you should look for a template that looks like this in your installation instructions. This would make life easier. I didn't realize I had one, so I used the actual part as my template. I'll show that process, but just use the paper template if you have it. You can then skip step 14 and use the paper template in step 15.

Step 14: remove the mount off the compressor

Use an allen wrench to remove the mount off the compressor Pulls off like this

Step 15: use the mount to mark the holes

Clamps will help hold it to the sheet metal, then drill small pilot holes thru each position

Step 16: remove the mount and drill larger holes

Remove the compressor mount, and it should look like this Now widen those holes out so they are clearance holes for an M6 bolt Should now look like this

Step 17: put compressor mount back on compressor

If you didn't use the paper template, mount the compressor mount back on the compressor using an allen wrench. Don't overtighten.

Step 18: paint it

I used the usual Rustoleum bed liner

Step 19: mount the compressor to the mount

Put some red lok-tight on the M6 screws Use a 10mm socket wrench to bolt the compressor on the mount Should now look like this

Step 20: put the entire assembly on the seat

Slide the mount over the mounting studs

Step 21: screw the stainless steel extension onto the compressor

It'll be a tight fit as it rotates and it may rub the compressor label a bit Screwed all the way in. Orient as shown so it's not pushing on the metal of the compressor

Step 22: add washers

Put some larger fender washers over the two studs that don't have the mount on them. They'll transfer the force as you bolt it down. Should be same thickness as sheet metal.

Step 23: put the seat mounts back on

Slide them back over the studs Put the original 6 nuts back on Here is how it looks from above

Step 24: put on the air filters

Pull out red plugs Put on some plumbers tape Screw it in nice and tight but don't overdo it Put in the filter and screw on the cap

Final product

Next week, we'll go thru how to put it all back in the Jeep and wire it up

Scott's Review Down the Road

Just did this a few days ago, so no exhaustive testing as of yet. Thrilled to have on board air though and not need to plan trips around towns to air up in. I've run the compressor in the Jeep in the driveway and it works great. No rattles or anything from the mount. I think this will be a great long term solution.

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