Check out this quick run down of how to install a Rock Smasher 2Way Air kit on a 2014 2 Door Jeep JK Rubicon equipped with a Twin ARB air compressor mounted on a M.O.R.E mounting bracket. We’re also working with a Genesis Offroad Dual battery system with two yellow top Optima batteries. For tires, this JK is rocking Nitto 35X12.5X17 Trail Grapplers. Installation time is about 3 1/2 hours.
1. Lay out parts to verify against system drawing.
NOTE: System drawing with kit doesn’t indicate 3/8 tubing between “M” & “N” fittings.
2. After Mock-up ( pictured above) a decision of splitting the air system to front to back instead of left and right facilitates running of one 3/8″ line to the rear instead of two 1/4″ lines.
NOTE: Kit does not have sufficient amount of 3/8 air line for configuration outlined in this instruction.
3. Procured additional 11′ of 3/8 air brake line. Four 5/16 stainless flat washers.
a. Flatten out the main control valve mount.
b. Build the air system valve assembly in accordance with drawing or to your application needs. Then attach to main control valve mount.
c. Route 3/8″ line approx 11 feet from the engine compartment air compressor area along outside the drivers side frame attaching to the underside of body with provided clamps and screws. Ending the 3/8″ line at the center of the rear crossmember just forward of the rear axle and install fitting “N” to crossmember.
NOTE: Keep air line clear from exhaust system.
d. Mark and drill two 5/16 holes into the M.O.R.E mount. Mount control valve mount assembly to the M.O.R.E air compressor mount.
NOTE: This is a good time to install the 3/8″ line installed in step c to fitting “M” on valve assembly.
e. Rear tire connection points: Utilizing existing holes drilled into body. Remove the inner fender well plastic retainer. Use a 5/16 drill enlarge the hole. Install fitting “E” to Fitting.
“F”. Cut 1/4″ tubing to length. Route 1/4″ tubing from fitting “N” and install into fitting.
“E”. Then install fitting’s “E & F Fittings into the enlarged mounting hole. Install flat washer and nut.
NOTE: This step is a little more difficult on passenger side due to fuel tank but with a little patience it can be done.
f. Front tire connection points: At the front body mounts located in the front of wheel well. Drill 5/16″ hole. From fitting “N” located near the engine ECM area. Route 1/4″ air line to each body mount area.
NOTE: There is multiple options for air line routing here. For this application both lines are routed along the fender then down to the driver side body mount. The route for the passenger side went along the front crossmember to the passenger mount. Just like the rear install fitting “E” into Fitting “F”.
Install fitting on to 1/4″ line. Then install through drilled hole install flat washer and nut.
g. Tire Pressure Set Point Valve (TPSV) mounting location is in drivers fender utilizing existing fastener holding ground cables to the body. This location its placed close to the compressor controls Run the 1/4″ line from the 1/4″ OD tee fitting “D” to the TPSV.
h. Build 4 tire connection whip hoses. Install fitting #2 into #3. Rotate tires to set the tire air fill valve to the furthest point from the air connection on the jeep. Measure and cut to length the colored 1/4″ tubing and install tubing into fittings.
System Integrity Test:
a. Remove (TPSV) valve and plug.
b. Install air source either shop air or from compressor on vehicle.
c. open supply air valve to pressurize system.
d. listen for air leaks or use soapy water check all joints for leaks.
e. After testing replace (TPSV) valve. Valve setting for this application was set to 35 PS
a. Install all whip hoses
b. Open manual control valve venting air to atmosphere.
c. Close the valve periodically to check air pressure at the fitting “F” on control mount.
NOTE: If your vehicle is equipped with TPMS, turn key on toggle menu to display TPMS and observe tire pressures. Close the main control valve when you reach the desired tire pressure.
NOTE: When opening manual control valve to fill tires the (TPSV) will lift momentarily.
System operation / performance data:
Pressure drop between PSI increments listed took 60 seconds.
35 to 30
30 to 25
25 to 20
20 to 15
15 to 10
This test was repeated with duplicated results. Over all time from 35 to 10 PSI took 4 minutes 41 seconds
Airing up: (vehicle compressor)
ARB Twin Compressor. Conditions – Engine running, Dual batteries are paralleled / boost on.
Pressure between PSI increments listed took approximate 1:30.
10 to 15
15 to 20
20 to 25
25 to 30
30 to 35
Total time between 10 to 35 PSI took 6 minutes 30 seconds. This testwas repeated with duplicated results.
Airing up: (Shop air 125 PSI 80 gallon tank reduced to 35 PSI)
This test was conducted to illustrate how fast tires will fill from 10 to 35 PSI using high volume low pressure supply. total time 10 to 35 PSI took approximately 3 minutes.
After using the system before and after 4 wheeling it drastically cut down my time dealing with airing down and up my tires. There’s far less bending and kneeling constantly checking tire pressures. I monitored the pressure using the vehicle TPMS system backed up by checking pressure at fitting “F” on the main control mount.
This guidance procedure was written and installed by: Jeff Williams & Randy Smith
NOTE: This written and illustrated procedure is for guidance only. Every vehicle is different, every owner will have specific needs for their system.