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a/c clutch shim procedure 850 1996

posted by  drewb on  Wed Jul 26 11:15 CST 2006
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last visit: Sat Jan 18 12:44 CST 2014
[RELATED]

Ok, my a/c compressor clutch gap is 0.35". This explains the cutout on hot days. I cannot see how one can possibly get the thing off. There is no clearance, visable screws, etc.

I know this has been discussed before, but any guidance on getting the clutch off and the shims stacked correctly would be greatly appreciated.

A pictorial guide would be fantanstic!

Thanks,

Drew








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    a/c clutch shim procedure 850 1996

    posted by  someone claiming to be steve d on  Wed Jul 26 13:39 CST 2006 [RELATED]

    Hi Drew,

    there are 3 round, threaded holes on the clutch, look carefully, the threads are probably full of dirt. They are fine threads, not sure of the size diameter. You need to screw small bolts that match the thread size into the holes and they push on the compressor to slide the clutch off of the shaft.
    Be sure to turn them all the same amount to keep the clutch straight as it comes off. If you turn one more than the others, it will make the clutch plate cocked and it will not want to slide on the shaft.

    This is a pretty tedious process, especially considering the location. You should not have to disconnect the refrigerant lines. Unbolt the compressor and move it to where you can get at it.

    The shims will most likely be stuck to the clutch plate or the compressor, so be carefull that you dont lose them by not seeing that. I had three shims in mine, I have read that some people have had two. I removed the two thin shims and left in the thick one and it has worked for over a year now.

    Hope this helps.


    steve d.
    94 854, 125k. '95 855t, 166k. '00 c70conv, 90k. '03 xc70, 45k.








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      a/c clutch shim procedure 850 1996

      posted by  someone claiming to be Peter on  Sat Jul 29 05:48 CST 2006 [RELATED]

      They are 5MM bolts. Very cheap at the hardware store. Also buy a 5MM tap. When you pull the plate off by tightening the bolts (after removing the center nut), the threads on the bolt will be damaged. When you unscrew the bolt from the holes, the damaged screw threads will damage the threads in the holes in the plate. Run the 5MM tap down those holes to clean them up so that you can get the plate off the next time. (Which may be in 5 minutes, if you took out too big a shim and now the gap is too small.)

      You have to unbolt the compressor from the block to have room to do this.








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    a/c clutch shim procedure 850 1996

    posted by  CJLomax on  Wed Jul 26 11:38 CST 2006
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    last visit: Tue Jan 18 20:40 CST 2011
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    I read on one board where a user added three bread tie clips to the clutch to close the gap rather than pulling the compressor and going through the trouble of changing the gap. He used super glue to bond the pieces and broke off the excess. However crazy it seems to have solved his gap issue.

    HTH

    CJLomax







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      a/c clutch shim procedure 850 1996

      posted by  dwc on  Mon Jul 31 03:10 CST 2006
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      last visit: Thu Jun 14 04:22 CST 2001
      [RELATED]

      Or you might try something else, which just this weekend worked for me. If your car has the heat sensor on the compressor, bypass it. And, install a relay in the circuit that energizes the clutch. These two things, on my '94 850 Turbo, bought me enough voltage increase at the clutch to make it engage properly. The initial problem was definitely that thermal sensor, but even with it bypassed, and when the engine was very hot, there was a voltage drop to the clutch. Now the system works fine, and if the clutch needs to be reshimmed, that will be the next logical, and apparently unavoidable, step.







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