Redid the A/C on my Turbo Buick with new AC Delco compressor, accumulator/drier, and orifice tube. It works great and is nice and cool. When I shut off the A/C with it running and the clutch disengages it makes a metal on metal sound grinding rotating sound. There are also shavings on the face of the compressor. If I turn it back on it is nice and quiet. I'm thinking this new compressor came with a defective clutch bearing/assembly? Can I just replace that bearing and if so how bad of a job is it or do I need to replace the whole compressor again?