Those grinder looking marks... As Jeff describes, it's called galling. He is describing what happens to the scroll set of a Copeland Company scroll when there is a lack of lubrication and metal on metal begins to occur. Possible causes of a lack of compressor lubrication are: 1. Low suction pressure Can be caused by: A refrigerant leak Dirty filter Liquid line restriction Low system charge General poor air flow 2. Liquid flood back, causing oil washing 3. Extreme heat causing lubrication break d