How to Replace the O-Rings on a Range Rover P38 EAS Valve Block

How to Replace the O-Rings on a Range Rover P38 EAS Valve Block

The air suspension on Range Rovers is a great feature that helps you get up and over obstacles with ease.range rover p38 eas valve block However, over time the o-rings and diaphragms can wear, causing leaking air and loss of pressure. This can lead to the air bags causing the vehicle to sag when driving on bump stops, and may even cause complete EAS failure.

So, to avoid all of that we recommend that you replace the o-rings on your air suspension valve block as soon as they show signs of wear. It’s a simple job that requires a few basic tools, and a couple of hours to do. The result being a system that is quieter and more reliable.

To replace the o-rings you need:

1) A smear of lube (the black lines in our kit have a brass fitting)

2) A pair of pliers (these are used to squeeze the o-ring out).

3) An assortment of spanners and screwdrivers.

Then lay the valve block on a flat surface and start to break it down. This is not a job for the impatient, it’s spring loaded and will come apart with a fair amount of force, but if you take your time and are careful the parts should stay together, just make sure you’re clear on which part goes where at each stage.

Once you have the valve block removed it’s worth noting the orientation of each of the Non-Return Valves (NRV) to help with reassembly, as they can easily fall apart and be lost. With that done, remove the four allen head bolts and start to disassemble each of the solenoids, being careful not to mix up the types. The air spring and inlet/exhaust solenoids are interchangeable with each other, but the exhaust solenoid has a different top o-ring that needs to be replaced (Bag A in our kit).

Assuming you’ve got all the parts you need, it’s time to reassemble everything. First, push in each of the o-rings in to their holes, these can be found by carefully inspecting the photo below or refering back to the diagram at the beginning of this guide. It’s pretty obvious which ones take 4mm, 6mm and 8mm o-rings, just be sure you use the correct size, as mismatched o-rings are the most common source of nuisance leaks. It’s a good idea to give them a little lube before inserting, as this can really help to seat and seal them.

After a quick check that all the o-rings are in place, you can reassemble the solenoids and put everything back into the valve block. Once that’s completed, reconnect the multi-plug and reconnect the pressure switch. I also like to apply a little Loctite thread sealant on each of the bolts before tightening, this helps to prevent them stripping. With the multi-plug and switch connected it’s just a case of reconnecting the wiring and test the air bag system on the road.

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