Beogram 4002: Restoration of DC Platter Motor

Recently, I received a Beogram 4002 DC platter motor from California for restoration. This shows the motor: 

I took it apart to get to the bearings (the two small donuts on the black pad):

I submerged the bearings in motor oil and pulled a vacuum. Immediately, strong bubbling occurred: 

The bubbling indicates that the vacuum pulls the air from the pores of the bearing material. This makes room for oil to inter diffuse into the material. After about 72 hours the bubbling stopped and I extracted the bearings from the oil:

Then I reassembled the motor and installed it in one of my Beogram 4002s for a 24 hrs RPM stability test with my BeoloverRPM device. It measures the RPM in 10s intervals and transmits the data to any serial port:

This is the curve I measured:

This result is pretty much as good as it gets for a Beogram 4002 DC platter motor. This motor is ready for duty again!