Copeland scroll failure

mejunkhound · 08-24-13, 07:13 PM

Finally got around to cutting the bottom off the compressor to look at the bottom bearing. Bearing itself good, bu--

Mystery solved - DEFECTIVE copeland assembly, screws attaching lower bearing to steel mounting plate shook out over time, allowing rotor to contact stator.

NO problems with oil or SSH or anything else, defective factory assembly -- e.g. they left the loctite off these screws?

There is a 3 tab bracket that is the lower bearing attachment, 3 ea specialty screws agttach the bearing to a steel plate - all 3 of those screws had shaken out over the last 15 years, allowing extra rotor play. I measured the journals and the shafts, < 3 mil clearance, typical of sleeve bearings, so no bearing wear to speak of. The lower bearing becomeing loos from the case allowed the play to let the rotor grind to a halt against the stator.

I hope the photos show up... They should be self explanatory, the steel mounting plate shows where the loose bearing oscillated till all 3 screw shook out, then there was enough play to lock the rotor.

Pictures did not copy, they are in the following link plus other details.

scroll compressor failures - Page 2

08-24-13, 07:13 PM	#1
mejunkhound Apprentice EcoRenovator Join Date: Apr 2011 Location: PNW Posts: 197 Thanks: 0 Thanked 47 Times in 31 Posts	Copeland scroll failure Finally got around to cutting the bottom off the compressor to look at the bottom bearing. Bearing itself good, bu-- Mystery solved - DEFECTIVE copeland assembly, screws attaching lower bearing to steel mounting plate shook out over time, allowing rotor to contact stator. NO problems with oil or SSH or anything else, defective factory assembly -- e.g. they left the loctite off these screws? There is a 3 tab bracket that is the lower bearing attachment, 3 ea specialty screws agttach the bearing to a steel plate - all 3 of those screws had shaken out over the last 15 years, allowing extra rotor play. I measured the journals and the shafts, < 3 mil clearance, typical of sleeve bearings, so no bearing wear to speak of. The lower bearing becomeing loos from the case allowed the play to let the rotor grind to a halt against the stator. I hope the photos show up... They should be self explanatory, the steel mounting plate shows where the loose bearing oscillated till all 3 screw shook out, then there was enough play to lock the rotor. Pictures did not copy, they are in the following link plus other details. scroll compressor failures - Page 2