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special tool needed

Brett on Fri October 10, 2014 2:28 PM User is offlineView users profile

Model: V5 1135154

Does any one know where I could get hold of the 'special socket' that fits over that mechanical destroker cam in the middle of the V5 piston arrangement? It is screwed on to the end of the drive shaft. I now see how this off-set cam unseats a high side bleed port in the middle of valve plate to the crankcase allowing destroking of the V5 at high RPM's. Thanks again in advance to all who respond here.

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Brett Reedy

iceman2555 on Sat October 11, 2014 10:49 PM User is offlineView users profile

Not sure what cam you are talking about. Can you forward a picture of the area of repair. Over the years have had to 'tear down' many of these units and unfortunately, can not place an image of your needs in my mind.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

Brett on Mon October 13, 2014 8:13 AM User is offlineView users profile

Thanks for your interest iceman2555. Here's a pic of the 'cam or excentric' I'm refering to. I think it's screwed in to the end of the drive shaft and must be removed before I can remove the drive shaft / swash plate assy. You have any manufactures and or part numbers for the tool? Thanks again !!

http://www.autoacforum.com/forumimages/100_2238.JPG



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Brett Reedy

GM Tech on Mon October 13, 2014 10:33 AM User is offline

It is screwed in to the end of the shaft-RHT- the tool was a speciality tool used only in the assembly/factory environment- never saw it in the open market- I may even have one in my junk drawer - no one I have ever known ever needed to remove it- I just leave it alone, and reseal the compressor to fix the shaft seal and belly leakers.

Optional Mechanical Destrokers were used on high speed mega horse power applications. The car companies paid extra for it.

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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......

mk378 on Mon October 13, 2014 10:51 AM User is offline

You could make something to fit that-- find some thinwall tubing that fits into the hole in the cylinder block but over the rotor, and dent the sides of the tube in or weld in blocks to catch the wide part of the rotor.

But that's mostly of academic interest, unless there is massive contamination you don't need to do a total tear-down.

Brett on Mon October 13, 2014 11:28 PM User is offlineView users profile

THANKS again to GM Tech, Iceman2555 and MK378 for your inputs here. I really do appreciate it! Yes please check that junk drawer. I would purchase it for a reasonable price. Otherwise maybe our machine shop students could make something for me.

You're all shaking your heads here... Why the hell does this guy want to take this compressor apart like this??! Well let me explain here. I'm a vocational / technical college instructor here in town. I teach refrigeration / air conditioning technology at a local technical college. The residential / commercial air conditioning industry does not have anything close to a variable displacement piston compressor at this time. The closest would be a two speed compressor on high end units. Although mobil A/C systems are not part of our studies, I have done a lot on my own and want to share it with those students who are interested.

I want to fully take apart the V5 so my students can see completely what's involved in the upstroke / destroke process here. Then, we will reassemble and build a full scale working model on the bench. We are using the actual components matched to this compressor ( condenser, evaporator, expansion valve etc. ) We are driving the compressor with a 7HP electric motor controlled with a variable frequency drive. This will provide us with a full range of RPM's to drive the compressor and simulate real-world working conditions.

For the record here, this compressor came off a 2000 Chevy Cavalier with the 2.2L base engine. Not sure why a compressor with a mechanical destroking valve option was installed on a Cavalier. GM Tech states these were only used on large performance factory engines. Perhaps it was replaced at some time years ago.

Well that's the story here... and I'm stickin' to it If anyone knows where I might get my hands on that tool to unscrew that mechanical destroker valve, please let me know here. It would make things a lot easier for me.

Thanks again for your inputs here !

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Brett Reedy

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