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A/C clutch adjust

padgett on Sun October 02, 2011 12:31 PM User is offline

Year: 1988
Make: Buick
Model: Reatta
Engine Size: 3800
Refrigerant Type: r134a

OK a/c compressor replaced a couple of months ago. Blowing 38F at ducts (working fine) when strange noise heard. Turned out that the pully ring had seperated from the clutch center.

Had another similar unit so removed pulley and top plate from that one.

Pulley went on fine and true (snap ring in place) but cannot adjust gap - pulls down to about .125" and that is it


Does anyone know what is going on and how to fix ? This just does not make sense. Yes, the key is lined up properly. Unfortunatly the only manual I have is for Delco HR6s and this is "something else".

Also have never seen this happen before, has anyone ?

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Many Carpets

TRB on Sun October 02, 2011 3:35 PM User is offlineView users profile

Are you using the same hub. If not is the shaft of the hub the same length as the other one?

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

padgett on Sun October 02, 2011 3:54 PM User is offline

Both hubs (new and original) act the same. Saw a reference to spacers but there are none, just a felt pad. Feels like it is hitting a stop except there is not one.

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Many Carpets

TRB on Sun October 02, 2011 4:29 PM User is offlineView users profile

Looking at the diagram I have, there are no shims. So I would think you have an incorrect pulley or hub. That's just a quick observation on my part. Something is causing it to not pull in enough or it's bottoming out before reaching the pulley face.

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mk378 on Sun October 02, 2011 4:57 PM User is offline

You are using the special installer tool right? It needs to be forced on with some effort, as friction holds it at the proper adjustment. The nut is mostly for looks. Don't count on the nut to push the plate all the way on.

padgett on Sun October 02, 2011 8:36 PM User is offline

That is what I needed to know - had the remover but not the installer. FLAPS had no idea what I was talking about. Have a kit with proper installer tool on order now. Thank you.

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Many Carpets

TRB on Sun October 02, 2011 8:46 PM User is offlineView users profile

Quote
Originally posted by: mk378
You are using the special installer tool right? It needs to be forced on with some effort, as friction holds it at the proper adjustment. The nut is mostly for looks. Don't count on the nut to push the plate all the way on.

Good point. I always assume people are using the required equipment.



91000-A

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com


Edited: Sun October 02, 2011 at 8:47 PM by TRB

GM Tech on Sun October 02, 2011 9:05 PM User is offline

Just remember, you never thread into the hub when installing, only the shaft-- and vice versa..

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

padgett on Wed October 05, 2011 11:44 PM User is offline

And is now on. Took the proper tool and more force than expected. As mentioned the nut is just hanging in space, if you try to pull down with nut are liable to deform the edge of the clutch plate and then will not pull down period. If woodruff comes out, axle grease works to hold in. Have seen various specs but .025" is not dragging and pulls in well.

Thanks for the advice. Was a learning experience.

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Many Carpets

GM Tech on Thu October 06, 2011 11:36 AM User is offline

The nut was never meant to adjust the clutch-it bottoms out onend of shaft- it was only there to protect the threads and keep shaft key in- and was completly eliminated in late 90's when bent keys were used....

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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