hi treetz, could you post the link for the kit plz. thank you

 

Porsche Cayenne Wabco Air Suspension Compressor Piston Ring Repair Fix Kit | eBay

 

great link thanks, can you run me through briefly on the change, i.e. location of compressor etc

 

Compressor is located under vehicle, below passenger front. Put treg in xtra high suspension setting. Hold suspension lock until it is locked out. Remove plastic cover underneath passenger side to get at the compressor (T27 bolts). Disconnect the two compressor electrical connections (small flathead screwdriver). Remove the three bolts holding the compressor support (13mm bolts). Tilt the compressor until you can access the two bolts that connect the two cylindrical bodies of the compressor located at the piston head (T27 bolts). Clean around the junction. Pull the parts apart to reveal the o-ring and the piston head. Take note of the piston seal orientation. Replace the piston seal and o-ring. Button it all back up.

I think you could adjust the amount of play the compressor has and make it run more quietly by adjusting the tension on the isolater spring (wide flathead) while you have it accessible, but I did not think of this until after putting it all back together.

 

Thanks for taking the time to post the info, helps alot.

 

Just finished the job took 30 mins again thanks

 

Great find! Looks simple enough to do! And saves money by not replacing the entire compressor.

I just hope there is an more cost effective way to replace shocks. I always fear that will go on my treg.

 

Just ordered the kit myself. I get a very intermittent "Fault Running Gear Workshop" message every so often that comes on with a beep and then goes out only to come on again. Happens 4-5 times on an around-town trip, eventually settles down. Could be the compressor. Could be any of the famously funky VW sensors. For $30, now I can fix the compressor if/when it goes punk.

 

The error is back! Consistently. VAG COM reads a pressure sensor intermittent ground. So disappointed!

I am likely going to try the repair kit that includes the air drier from ECS. Anyone have experience with it?

 

The error is back! Consistently. VAG COM reads a pressure sensor intermittent ground. So disappointed!

I am likely going to try the repair kit that includes the air drier from ECS. Anyone have experience with it?

It's likely you may have leaks in the air system other than the compressor. Check that the 4 air suspensions are free from leakages before trying the kit again. I have a similar issue too on my V6 Treg.

 

I installed the repair kit 100698010A yesterday and found that the old piston seal was worn. There was black residue from the wear and tear all inside the compressor head. When I took apart the old head/drier I found the desiccant beads to be brown and brittle. I did not open up the new one to see what they are supposed to look like, but I think they were the originals and were no longer removing moisture from the system as evidenced by the rusty spring inside the unit.

Perhaps moisture in the system caused premature wear on the piston seal. No errors on the first ride. I will report again to inform how the repair holds over time.

The desiccant beads discovery makes me think replacing the piston seal and the desiccant beads would be a sufficient repair for someone not willing to buy the whole kit.

 

How about an updated report? How has the repair held up? Where can I purchase the desiccant replacement?

 

I just used one of the kits to replace the piston ring, works much better now... no errors so far.
I hope I'll not have to do the dryer too.

 

On the older models (T1, T2?), the drier is supposed to not ever need service. According to an SSP, the incoming air is dried and moisture is absorbed. When it is discharged, it goes through the drier again and the outgoing air is moisturized, thus rejuvenating (drying) the desiccant.

 

Thanks for the info.
Anyway I'll keep an eye on that ring... probably they (ebay sellers) all buy it from the same supplier in China.

Anyone have an experience with a repair kit that lasted longer then a few weeks?

 

I got one on eBay (or Amazon, I can't remember) for less than $40 USD shipped. Seems to be fine. <shrug>

 

in my case i switched the piston ring, reinstalled the compressor, then found a leak at the elbow, bought new elbow reinstalled then found a leak at the exhaust valve, broke the exhaust valve trying to replace the o - ring then bought whole new compressor. All in the winter here in balmy saskatchewan

 

I replaced o ring and piston seal on my air compressor yesterday because it was sounding like it was laboring, i.e. the pitch would change and sound like it was going slow then fast. Everything still worked fine, now after the change out the air suspension won't go to extra height mode and when I try loading mode it says compressor filling but air compressor isn't running. Took everything apart again and still no extra or loading modes, sprayed soapy water on manifold air connections and no sign of leaks. Does anyone have suggestions on the remedy. Thanks Mtnride

 

The only obvious errors I can think of is:

1. You are not getting power to the motor. Check for +12V to the motor when it is supposed to be filling and double check that you have low resistance on the ground wire to body chassis.

2. The motor has power, but it is not moving. Check for free movement of the piston.

 

nickyt, thanks for the reply. Compressor is running, so power isn't the issue, motor sounds like it's working and running smooth compared to how it sounded before rebuild. I didn't remove compressor from truck so perhaps I should to have a better look. I was careful to note piston ring position and thought I replaced just as it came out. Also have running gear fault now and my computer is in the shop so no VCDS till sometime this week

 

Hmmm...

I wonder if, while you were working on the compressor, if a code got set. If so, it might be like many Touareg systems in that you have to clear codes with VCDS before they work again.

Other thoughts.

Do you think that the pressure tank is filling up to the correct pressure? Did the air compressor run and then turn off, like the pressure tanks are full? It would be nice if we had an air pressure gauge beside the air tank in the rear boot.

If we have full pressure, then it seems like we confused the controller. Without a vcds handy, I might be tempted to pull the battery cable to 10 minutes then restart. Hey, it might work.

 

I do think the tank is filling as the pump runs for a coup!e of minutes then stops. As I said if I try to put it in loading mode MFI says tank filling but compressor is not running (odd). I'll try battery disconnect and when I get computer back I'll see what the VCDS says. Thanks again, Mtnride

 

You do have all the doors, including the rear hatch and hood closed. Right? Any of these open will mess with the air suspension self leveling.

This just popped back into my head. I hope that your solution turns out this easy.

I ran into a funny "no fill" the air tank situation this year.

The vehicle had been off for over a day when I hooked up the battery charger and was running VCDS scans for other problems. I had parked with regular level, and at some point during the scans dropped to the loading level. At the end of the work, with a full battery, I decided to turn the switch to put the Touareg back in normal height.

The vehicle refused to lift and the compressor did not start. I scanned with VCDS (still connected) and did not find any new faults. Tired, I eventually decided to just move and park the vehicle. The heck with this new problem until tomorrow.

Saying unkind things about everything German, I turned the key, the engine started, then the air compressor started, my jaw dropped, and that is how I learned that...

The compressor controller does weird things. Sometimes it will not power up the compressor if some "software" timer has timed out. The reset / solution was to start the engine.

 

The back hatch might have been open the first time I tried it but I closed it and tried again with all closed. Yesterday took a hour drive and running gear fault wouldn't clear even after start, shut down and restart.

 

Drat! Then I am all out of ideas until we get a VCDS scan.

Hopefully we can quickly sort it out with the scan.

 

On my way to get computer, I'll run a scan and report back

 

Just did scan, 1 fault 01772 - Signal from level control pressure sensor (G291)
008 - implausible signal - Intermittent.
I'm going to take it apart again tomorrow and check all electrical connections. Pressure tank fills to 7.5 Bar and dumps to .96
Bar when I select auto mode.