I have two YT chillers used with R-11 refrigerant,
they were initially started up twenty six years ago,
for the past 7 years, they have been left unused, and now the customer wants to reuse them for their supermarket air conditioning,
I just had the compressors(YTJ-67) disassembled,
both compressors' bearings and seals(Balance piston and eye seals) have some scrtches and scuff marks on the inner surface, and on the outward surface, there seem to be corrosions that I suspect it was caused by moistures in the refrigerant system and no lubrication(as I mentioned these two chillers have been put idle for 7years),
My questions are:
1. are these bearings still useable?
2. what is the life span for Aluminum Alloy bearings used in York centrifugal compressor?
Any advice will be much appreciated.