Im a second generation York mechanic so i have caribbean blue running through my veins. However, I've got 6 2200 ton carrier 17m chillers under contract and i have to say these chillers are built like sherman tanks. I've had some seal failures though after about 10,000 run hours. I've been told by a local Carrier tech to use the quad ring instead of the oring and to put a thin bead of locktite AV on the shaft shoulder where the contact ring meets. Is anyone else using this method or is this guy blowing smoke rings?