Quote: OK, I see it now. I agree that the support ring could and should have a larger OD.
Not really. The support rail only takes up space in the groove. With the oil package oriented right and compressed, that will be fine.
The op said the rings were "shaving" alum from compressor. My guess is the scrapers are not seated in the expander properly and are jumping out and catching on the support rail as shown here. The ONLY other way shaving could happen, is if the ring is actually too wide for the ring groove. IE, the ring is a .210 wide ring and the groove is cut .170 or something similar. If the piston easily slides through the compressor, it should with the rings loaded as well.
Groove vs ring width is easily checked with calipers. I know you have another set of rings ordered, but don't just assume all is well......CHECK IT
