Hi.
We have had a number of requests for a YouTube Video explaining the Reason, Cause and Solution to the "Slipping Cone Clutch" problem on the SD40 and SD50 Yanmar Saildrives.
Here is the link https://youtu.be/ov1c6E3lcAM
During the Video we also discuss the Vent System, and Dual Lip lower drive Oil/Shaft seals.