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Discussion Starter · #1 ·
hey... I'm expecting my compressor rebuild kit soon, and I started tearing down the 3 to get the compressor out.

when I pulled the compressor from my RRS, I don't recall having any difficulty whatsoever removing the protective casing. right now I have the bottom of the case off, but it doesn't seem like there's enough room to monkey the top case out, and I can't access the mounting bolts for the compressor without removing the top of the case...

what am I missing?
 

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I took mine out recently, I have an AMK compressor I bet that’s what you have too. Once the bottom cover is off you can remove the compressor and leave the top cover in place. There are three screws that go through the rubber mounts at the bottom of the aluminum bracket. The compressor should come out without removing the aluminum mounting bracket or the top cover. You probably had a Hitachi compressor in your RRS, those are more compact.


image.jpg
 

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Discussion Starter · #3 ·
thanks for that. I have a hitachi on the 3 also, and on my RRS somehow I just got got the cover off and took the compressor off with the bracket.

from memory, I feel like the hitachi has two rubber mounts on the bottom and one on the side which I can’t access.

I’ll look again in the am
 

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Discussion Starter · #4 · (Edited)
So I got my compressor out… what a bitch this one was. I had to undo the bottom rubber mount, force the compressor off of the lateral mount, and that have me enough room to drop the compressor inside the bracket.

I’ve identified the leak, some asshat apparently rebuilt it once upon a time and instead of the large o-ring at the end, used some DIY sealant crap. It gave out.

all of the kits I see don’t include an o-ring this large.

anybody know what’s up with the o-ring for this piece:
93488
 

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Discussion Starter · #5 ·
Ugh, so the saga continues. I replaced the sealant goo with some new sealant goo and reinstalled the air compressor.

now the rear is lifting but the front isn’t, and I’m getting “remove obstacle and reset suspension” errors

following codes are present:

C1131
C1A00
U0421

I also notice that as soon as the compressor turns off, the gallery pressure depletes.

I did deflate the bags and exhaust the reservoir with the nanocom prior to pulling the compressor, and I did reactivate the EAS with the nanocom after assembling the vehicle and recalibrate the SAS.

I didn’t touch the reservoir valve block at all, and I’ve double checked my air lines. I’m having trouble understanding how the rear can lift and hold but the front can’t, and why I’m getting the obstacle warning
 

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Some old goo must have made its way to the front valve block. If gallery pressure is dropping as soon as compressor shuts off and front is staying down I would check it first. Takes about 20-30 mins to take it out and take it apart.
 

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Discussion Starter · #7 ·
Hmm. I guess I could drop it and have a look. I’m positive that no goo remained, but it’s worth a look
 

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Discussion Starter · #8 ·
Well, it wasn’t gunk in the valve block. I Amazon next-day ordered a cheapo hitachi clone and slammed that in. Works like a charm.
 

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Discussion Starter · #10 ·
....for now.
haha yeah, they are certainly disposable items, but it was a crime of necessity... wife wants to drive the 3 because the 2 doesn't fit into some parking garages

I'll probably order a used Hitachi from ebay and rebuild it one of these days...
 
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I bet your old one is still rebuildable. According to the diagram same compressor line is supplying front and back struts. If valves are not the problem then compressor is not pumping out enough pressure to lift the front. Could be worn piston rings or cracked output cap.
These guys have just about every component needed to rebuild a hitachi compressor.

93504



haha yeah, they are certainly disposable items, but it was a crime of necessity... wife wants to drive the 3 because the 2 doesn't fit into some parking garages

I'll probably order a used Hitachi from ebay and rebuild it one of these days...
 

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Discussion Starter · #12 ·
I am unable to reseal the end cap on my old compressor. The unit was designed to seal with an o-ring but was sealed with some sealant gunk instead. In the absence of the correct o-ring or an adequate sealant, I’m not sure how to proceed there.
 

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the end cap you are referring to in an earlier picture does not appear to have an O ring in the tear down videos. The area it covers is not pressurized. Just needs enough seal to prevent water infiltration, should be ok without any sealant or a very thin bead of RTV for peace mind.
 

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Discussion Starter · #14 · (Edited)
Curious. I must’ve lost my piston seal then, because that’s for sure where it’s leaking from. When I pulled the plate and scraped the goo off, there’s clearly a channel for an o-ring. I stopped the rebuild process when I got there. Perhaps I’ll rebuild the Dunlop and throw it back in to see.
Thanks!

@Carb0nation that video and other videos are awesome! I fumbled through my last rebuild like a stubborn roadtripper with no directions
 
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