Beogram 4002 DC Motor Restoration

A Beogram 4002 DC platter motor arrived from California for restoration. This shows the motor as received:

I disassembled it to extract the Oilite brass bearings for oil infusion:

The bearings are the two small donuts on the black pad up front. I immersed them in motor oil and pulled a vacuum:

Immediately, strong bubbling started indicating that air was being extracted from the bearing to make room for oil diffusion into the porous material. After about 3 days the bubbling stopped and I extracted the bearings from the oil bath:

I reassembled the motor and installed it into one of my Beogram 4002s for performing a 24 hrs RPM stability test with my BeoloverRPM device:

This is the curve I measured:

This is pretty much as good as it gets with Beogram 4002 DC motors. This motor is back in business!