964 turbo A/C compressor rebuilders?
 

I pulled the A/C compressor from my 55k mile 1991 turbo.

Given how hard it is to get a replacement, is there anybody rebuilding them?

True "Rebuilding", would require, jig bore, jiq grind or at least a good honer.
Matching oversized pistons to enlarge bores. Removing a difficult to remove
swash plate, matching of some half bearings. And, in severe cases replacing metal.

I'm gonna say the normal 'rebuilding, re-manufacturing, repairing, etc.' service market will be limited to replacing seals, o-rings and maybe a few bearings, sprinkling some Becks on it for good measure.

It all starts with a teardown to see what is worn, such as pistons, bores, swash plate, reed valves. If they all look good and there are no metal particles or signs of grey matter, you might get away with a seal kit.

Clutch wise, you could replace the bearing, maybe fly cut a mil or a few thousand off the clutch faces, difficult to repair a toasted clutch coil or re-vulcanize on some rubber, at best if its a spring steel plate, drill out some rivets, replace the springs, and re-rivet.

If they say its a 'rebuilt, remanufactured or whatever' factory' Denso or Nippondenso, ask by whom? It should be in Denso box with a new Denso label on it.

anywhere that i can send it to see what is possible?

I'd suggest you tear it down yourself.
Not that difficult.
Get yourself old clean cookie sheet with sides.
Empty large coffee can.
Some metric sockets, snap ring pliers, metric hex socket (6mm)
Bench vise.

Turn puppy over the coffee can so ports aim in it.
Turn the outer clutch hub bolt head a dozen times in both directions.
Tilt it left and right, drain out as much oil as it might have (little to 1 oz).

Take the clutch face plate bolt out (air gun).
Pry of clutch face.
Take of snap ring.
Take off pulley.
Take off snap ring.
Take off clutch coil.

Hold compressor by its mounting ears (things the comp bracket bolts go through),
carefully in vise. Remove long allen bolts.

Move comp over to cookie sheet.
Take off back side with reed valve and plates.
Take off nose (what clutch was on).

Carefully inspect bores, pistons and swash plate (the funky round aluminum disk on the shaft that pistons slid over). Inspect reed valves. If no wear and no grey or black matter, put it back together with a seal kit. If question get a new Denso compressor and move on.

I removed the original A/C compressor.
I have since installed another compressor from a low mile car.

My original Denso only has 55k miles on it but wasnt working.
Given how hard it is to buy a correct unit for a 1991 turbo, i was wondering if my unit has any value?

Toss it up on Pelican Classified

How's your replacement unit working ?

Will be taking the car out of winter storage next week and running it all summer.
It was working great once it was installed last year!

Good ... I'm glad it worked out