AC R134 Conversion (Page 6/8) wgpierce AUG 09, 07:57 PM quote Originally posted by computer_engineer: Does anyone have a picture of the DA6 compressor right next to a new 4 Seasons 58255 compressor??? I am concerned about the depth from the mounting ears at the front. I have put in new headers from WCF, and I hoping someone will have the dimensions, images, or something that will tell me that the new compressor is either exactly the same depth (which may be a concern for the rear bracket) or slightly less (which would be a relief, and give the new header pipe some room). I just did this in my 87GT a little while ago and the 58255 is exact same dimensions as the DA6. From the outside you can't tell them apart. Also good choice not getting a reman from ebay. I did and it was a POS! computer_engineer AUG 20, 11:42 AM I am putting the AC compressor back in place to see if it will fit - and it doesn't. Starting to wonder if getting these new West Coast Fiero headers is going to be worth it. None of the heat shields fit, and now the AC compressor bracket. Has anyone ran across this before? I am sure someone has put on new headers, and then had a host of things not fit back on the engine. For some people, it may not be a big deal, as they can fabricate a new bracket or modify the current one, but I do not possess those skills and I just want to get this sucker back together again. It looks like I just need to grind off the back side of the bracket (about a half inch, maybe less), that holds onto the ring to the rear and the front lug on the compressor. Now I just need to find someone who has a grinder... I'm also nervous about grinding into stock parts like this, that may not be replaceable. computer_engineer AUG 22, 12:01 PM Here is a picture of the bracket nearly in place, with the new header blocking it. The circle area is where I see most of the problem. However, this next photo also seems to indicate that I will need to grind some off of the circular bracket on the back of the compressor. That makes me nervous, so radically modifying a somewhat irreplaceable Fiero part. This last one shows the bracket from the AC compressor that mounts to the engine, and how close I am to getting the holes lined up. The blue circle shows the mark on the engine bracket where the AC bracket went originally. The red circle is where the bolt is, and the red arrow the direction I need to move the bracket. How much do I grind off? Is it safe to grind material off of both brackets? Is there an alternative? fierofool AUG 22, 02:06 PM Instructions that came with my compressor suggested when installing a replacement HR or DA, that the mounting brackets be loosened at the engine, then tightened at the compressor. In part because the compressors don't have dowel pin locators for the 3 case parts, and because there's a little give in the mounting holes in the brackets. This will help to prevent twisting the case, therefore breaking seals, and to help the mounting brackets align. If all else fails, maybe put a little dimple in the header with a ball peen hammer. wgpierce AUG 23, 11:08 PM Yeah, I'd be pound on the headers before I'd grind anything off the brackets. At least you can go back to the stock manifolds computer_engineer SEP 05, 11:51 PM Does anyone have a spare rear "ring" bracket for the AC compressor, for an 87 GT? Better yet, anyone have a bracket that they could measure for me? I am thinking about making a replacement bracket that is more friendly with headers, but I need a detailed drawing and some measurements. Daryl M SEP 15, 10:36 PM Doing ac on an 87 for the first time myself. I ordered a remanufactured Four Seasons compressor from Rock Auto. According to the tech notes from Four Seasons that are linked to the Rock Auto site, the compressor comes prefilled with 3 oz of PAG. Doesn't say what weight. Just getting into my newly built workshop so not sure when I will get to this project kjelle69 FEB 28, 06:20 PM I have read about a direct replacement for the R12 that they claim should work on old R12 systems aswell as newer R134A systems. Anyone who have tried one of these? Fyll din AC computer_engineer JUN 05, 11:49 PM Got a new 4 Seasons compressor. I did not come with a notice as to what kind of oil was in the compressor, but it did come with a bag of rings or seals or something. Can anyone tell me what these are for? Also, the new accumulator as R12 fittings on it, and one will need an R134 adapter screwed on. Question...should I put any thread sealant on the adapter? The cycling switch that gets screwed on the other R12 fitting, has a small O-ring, but does it seal around the top or the bottom of the fitting? The ring does not seem to fit down at the base of the threads, but it is loose enough, that it does not seem to fit at the top of the fitting against the switch. Any idea how the switch is supposed to seal against the fiting? Thanks. RWDPLZ JUN 06, 09:55 AM The sealing washers replace the special o-rings as the compressor seals on the suction and discharge ports. The compressor should have come with instructions showing how to match up the compressor ports and your hose assembly connections. If you pull the sealing cap off the compressor, you'll see instead of o-ring recesses, two flat recesses of different depths. Good time to also spin it over and see if any oil comes out the discharge port and install switches. A good conversion fitting like Four Seasons 59976 will have a little thread sealant on it. Make sure to remove the schrader valve from the accumulator on the port you install the conversion valve on with the 59976, it comes with it's own valve. Cheap pot metal adapters without valves like you find at most auto parts stores should be avoided. The o-ring on the cycling switch seals on the shoulder at the end of the threads as it's screwed down. The port you install it on should keep the schrader valve in place, so that the switch can be removed. This is what the little raised dot in the bottom of the switch is for, it opens the valve once fully seated.