Not thinking, but knowing, single drive belt systems have been around for about 30 years now. Like a rope in series with a spring tied between two tree. Hang an excessive load on that rope can exceed the force on that spring, it will stretch as will the tensioner spring. Compressor loads are not constant, more like pulse loads, but not put stress on the tensioner, but any other sheave in the system as well.NickD,
That's something additional to lookout for, right? Not related to the tensioner? Why do you think the tension pulley only makes the noise sometimes?