A/C Clutch Adjustment Attempt - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-01-2009, 08:53 PM   #1
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Default A/C Clutch Adjustment Attempt

Well I bought the nifty little tool I read about so I could try adjusting the a/c compressor clutch. The 13mm nut came out all right but the tool would not start into the threads like it was supposed to. I tried some pb blaster in there to clean things up and then blew some air in to clean it out but no way would it start. Finally I got a little mirror out and looked in the end and saw that the threads were all pulled out of the first 3/8" or so, they were broke right out and still in there. I think someone tried to adjust this before and failed, pulling a bunch of the threads out doing so. I guess the next option is replacing the compressor should it get much noisier. Also, how do you hold the clutch from spinning while you work on it? I stuck a screwdriver against a pc of it but figure there is a better way I don't know about.Thanks for listenin.

Dave
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Old 11-01-2009, 10:12 PM   #2
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I use a large channel locks pliers.
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Old 11-01-2009, 10:16 PM   #3
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I'm not familiar with what you are working on, but can you re-tap the hole with the damaged threads? Failing that, can you drill it out and tap it one thread size later? I apologize if this generic response does not apply to the specific repair you are working on.
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Old 11-01-2009, 10:27 PM   #4
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This is what I believe is stripped, there is no way to tap the outside set of threads without removing the clutch, and you can't remove the clutch without the threads.

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Old 11-02-2009, 01:50 AM   #5
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Which clutch tool do you have?
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Old 11-02-2009, 07:59 AM   #6
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More then likely he has this one.

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Old 11-02-2009, 02:02 PM   #7
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I was thinking he might be able to catch a thread or two with a different brand tool.

The clutch has about 8 threads that are 21mm x 1.5 metric threads. Some clutch pulling tools do not have 8 threads and can’t reach all of the threads in the clutch.

The clutch puller for older GM compressors use a course thread 7/8” x 14 sae threads and will not work on our compressor clutch. If you try to use the older 7/8” x 14 thread puller you will trash the first 4 threads in the clutch.

Another option might be using something wide and flat like putty knives or kitchen knives to wedge the clutch back far enough not to grind.
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Old 11-02-2009, 03:58 PM   #8
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Quote:
Originally Posted by ron350 View Post
If you try to use the older 7/8” x 14 thread puller you will trash the first 4 threads in the clutch.
That might explain why his first threads are damaged.
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Old 11-02-2009, 06:48 PM   #9
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Quote:
Originally Posted by ron350 View Post
I was thinking he might be able to catch a thread or two with a different brand tool.

The clutch has about 8 threads that are 21mm x 1.5 metric threads. Some clutch pulling tools do not have 8 threads and can’t reach all of the threads in the clutch.

The clutch puller for older GM compressors use a course thread 7/8” x 14 sae threads and will not work on our compressor clutch. If you try to use the older 7/8” x 14 thread puller you will trash the first 4 threads in the clutch.

Another option might be using something wide and flat like putty knives or kitchen knives to wedge the clutch back far enough not to grind.



I do think my tool is 7/8 x 14. Just measured it by my tape measure but it looks like 7/8. No wonder it would not start. I may try the correct metric one if I can find it.

Also, the idea about prying it out a bit, where exactly would I pry? And this would be with the 13mm nut removed from the middle shaft I am guessing.

I sprayed a bit of WD 40 on it this morning because after messing with it the noise was a bit louder than usual. It did help a good bit and the ride home was quiet.
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Old 11-02-2009, 06:52 PM   #10
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Quote:
Originally Posted by Danthurs View Post
More then likely he has this one.

Hey that is my tool exactly! I just looked and it is the same part number and all. Is that the correct one?

Thanks guys.
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