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AC compressor leaking 900

posted by  someone claiming to be Ira Eisenberg on  Tue Jun 30 05:09 CST 2015 [RELATED]

The AC compressor is leaking refrigerant. I have been unable to find a replacement with screw-in mounting holes for the hoses.....same configuration as the old one. Rather the replacement, which is identical in all other respects, has 2 nipples for hose mountings.

Is the original style available or is there some type of adapter nipple to make the new style compatible.

Thanks








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    AC compressor leaking 900

    posted by  someone claiming to be Ira Eisenberg on  Tue Jun 30 11:02 CST 2015 [RELATED]

    Here is an update. I have a 93 960 with Sanden compressor model 7846 which, according to the Sanden website , has been discontinued replaced by model 4264. No photo available. Elsewhere on the website model 4263 is listed for the 95-97 960 and model 4664 is also listed. Both have nipples for mounting the hoses. The shop I went to ordered model 4664 but did not get it mounted.

    So now I am thoroughly confused. Thanks for all help.








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      AC compressor leaking 900

      posted by  Amarin on  Tue Jun 30 13:08 CST 2015
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      last visit: Thu Oct 23 22:42 CST 2014
      [RELATED]

      Hi,

      I think there no way your hoses could fit into the new compressor. Your existing hose has the block type fitting whereas your new compressor has the UNF (unified thread standard - fine) fitting. And there is no such adaptor available for this purpose. I would recommend returning the new compressor back and search diligently for similar fitting.

      In case of there's NO any other option you could transfer the backhead of your previous compressor to the new one. As you can see there are six bolts securing the backhead (where the fitting is located) on your previous 7846 compressor. And your new 4664 compressor has the same six bolts too. Only that the bolts length are LONGER on your previous compressor due to thicker backhead. You must use back these longer bolts in order to secure your previous backhead to the new compressor. And Sanden compressors has interchangeable backheads provided the number of bolts are the same (only take note of bolt lengths).

      Here's the link to such conversion:
      https://www.youtube.com/watch?v=XHf_RCGjVJQ

      This conversion can be done by your AC installer. There's no special tool to use. Just make sure the bolts are installed WITH its washer too. The washers are part of the sealing mechanism of the compressor. Tighten the bolts to specs using the star pattern. For M8 bolts tighten to 25 ft-lb. M6 bolts tighten to 10 ft-lb. Don't over tighten as this may distort the head or under tighten as leak may occur.

      Here's the Sanden service guide for details:
      http://www.sanden.com/productlibrary/manuals/sd_service_guide_rev_2.pdf

      You might invalidate your warranty by doing this. Only as a last resort.

      Good luck,
      Amarin.








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        AC compressor leaking 900

        posted by  volvo426 on  Tue Jul 7 03:49 CST 2015
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        last visit: Thu Oct 23 13:44 CST 2014
        [RELATED]

        In case of there's NO any other option you could transfer the backhead of your previous compressor to the new one.

        That is what i had to do here in Australia with my 92 960 straight six.








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    AC compressor fittings 900

    posted by  Amarin on  Tue Jun 30 08:24 CST 2015
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    last visit: Thu Oct 23 22:42 CST 2014
    [RELATED]

    Hi Ira,

    For the 900 series the commonly used compressors are from Seiko-Seiki (scroll type), Zexel and Sanden (both reciprocating pistons type). These compressors come with "ear-type" mounting to the engine.

    Depends on the replacement compressor make and model there might be one with the specific type of fitting for the existing hoses in your car. If you're looking for a simple fit-in/screw-in adaptor to fit over the hoses then have a look in eBay. But I would not recommend the use of such fitting as there may be risk of refrigerant leak due to tolerance issues in manufacturing. Its better to use replacement compressor already comes with your type of hose fitting.

    Here is the link to eBay:
    http://www.ebay.com/bhp/ac-compressor-fittings

    Have a look also in Nostalgic AC parts:
    http://nostalgicac.com/compressors/compressor-fittings.html

    Sanden compressors have the entire back plate replacement in case any of the fitting breaks during tightening. This is because for Sanden the hose fittings are part of the compressor's body.

    Zexel/Seltec compressors have many interchangeable fittings available between the compressor's body and existing hoses.

    Seiko-Seiki compressors don't have that many aftermarket parts. It is dying breed. Better to look for Sanden or Zexel variety. But it has the least AC load on the engine.

    You could go to a specialised AC shop to remove the existing fitting of your hoses and install the needed ones for the new compressor. Such shop have the specific compression tools to install these new fittings.

    Lastly if your original compressor is still sound (not much rattle/noise) you could sent it in for rebuild. The most common leak point is the shaft seal. This seal is located behind the clutch pulley and requires special tools to replace. The replacement seal itself is specific to each compressor make. A specialised AC shop could do this.

    Regards,
    Amarin.








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    AC compressor leaking 900

    posted by  spook on  Tue Jun 30 06:05 CST 2015
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    last visit: Fri Oct 24 08:06 CST 2014
    [RELATED]

    Dear Ira Eisenberg,

    Hope you're well. What year and model, e.g., 940 or 960, etc?

    Is the maker noted on the compressor's dataplate, if you can access it/read it (corrosion might have made the markings illegible)?

    Also, if there's a part number on the dataplate, that would be especially useful.

    Hope this helps.

    Yours faithfully,

    Spook







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