DA6 and HR6 Compressor Teardown and Comparison (Page 2/2)
Notorio DEC 07, 12:01 AM
Seals was probably not the right word ... I meant whatever it is on the pistons that slowly disintegrate w/o sufficient oil, shedding black particles, and finally allow metal-on-metal grinding to commence and unleash the metal chips ...
xenocide MAY 24, 09:06 PM

quote
Originally posted by RWDPLZ:
Reassembly is the reverse, with new seals coated in mineral oil, even if you're doing an R-134A conversion. In the case of this HR6, I had to reclock it to use it in the Fiero. This is what the correct compressor clocking looks like:






I know I'm opening a very old post but I see RWDPLZ is still active here and I've been scouring the internet for this information and this forum post is all I've found; hoping @RWDPLZ is still subscribed to this post and would be willing to help.

I'm fitting an HR6 compressor to a vehicle that it wasn't meant for and am struggling to find one that's clocked just right; I bought a new one only to find the rear ports are in the wrong spot (after I fitted the correct pulley and clocked the magnet.) My question is simply; what are the steps to re-clock an HR6; can you just rotate the rear housing 33 degrees or do the front and rear housings need to be rotated together? I haven't cracked it open yet and can't tell for sure from the pictures how that would be done.

Thanks in advance!

[This message has been edited by xenocide (edited 05-24-2022).]

RWDPLZ MAY 24, 09:30 PM
The front and rear housings don't need to be in the same orientation together, the compressor was designed so that the front and rear castings can each be mounted in one of 3 positions: Notice how the bolts are not equally spaced around the perimeter of the body? They're basically in 3 pairs, meaning the front has 3 potential orientations, and the rear has 3 potential orientations. You have to remove the 6 through bolts and pop the rear casting off to re-clock it, same with the front.

In doing so you'll need to replace the body seals, and the shaft seal that's likely bad. Lube with LOTS of oil.
xenocide MAY 24, 09:54 PM
Thank you sir! The front is fine; so it sounds like I'll just need to pop off the rear, clock it, then reinstall with a new body seal (I see that should be in the MT2118 kit) and lots of oil. It's a new unit so was hoping to re-use the seal but will order the gasket kit just to be safe.
RWDPLZ MAY 24, 10:05 PM

quote
Originally posted by xenocide:

Thank you sir! The front is fine; so it sounds like I'll just need to pop off the rear, clock it, then reinstall with a new body seal (I see that should be in the MT2118 kit) and lots of oil. It's a new unit so was hoping to re-use the seal but will order the gasket kit just to be safe.



If it's brand new it will probably re-seal fine, HOWEVER, the new compressors may be different internally, I've never taken one of those apart, supposedly they're significantly improved over the old ones.
xenocide MAY 24, 10:17 PM
It's new old stock (guessing it's from the 90s) so it'll likely be the same.

I could see the rear cap had some differences (rectangle hole, oval hole etc.) so wasn't sure if there was something that required it to stay aligned as built by the factory. It makes sense that it would be modular so could just be rotated to work with the vehicle it was being installed on. Hope to give it a try this weekend. Thanks again!
RWDPLZ MAY 24, 10:45 PM

quote
Originally posted by xenocide:

It's new old stock (guessing it's from the 90s) so it'll likely be the same.

I could see the rear cap had some differences (rectangle hole, oval hole etc.) so wasn't sure if there was something that required it to stay aligned as built by the factory. It makes sense that it would be modular so could just be rotated to work with the vehicle it was being installed on. Hope to give it a try this weekend. Thanks again!



Ah ok, an NOS unit. I would replace all those rubber parts with the new HNBR green o-rings and the front seal, you can also see if it had any oil in it and drain it.

I used the DA6 rear head with the HR6 compressor and it worked fine, I re-used the DA6 rear because the HR6 I had came off a car that didn't have 2 switch ports like the Fiero does.