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Just pulled my pumps to top off the oil in rear bearing housings. I believe that July of 2018 was the last time I had opened up the cones. The bearings look good and feel good. They were installed in 2016 so six years on the bearings and four years since I have topped up the oil.
Both cones had a nice vacuum seal when opening. Both had significantly less oil than I initially put in but the bearings were well coated. There was no sign of water intrusion.
How the gear oil escapes remains a mystery.
I poured out the oil and found it to be a thick slurry with the grease I had packed the bearings in.
This is starboard
This is port
I filled the housings with fresh gear oil then I filled the cone with marine grease. I believe it will mix once the shaft starts spinning.