We had a problem with our SD50 saildrive
, where if we selected forward, it would not always engage, however if we bliped the throttle it would then engage. Once engaged there was no slippage and it performed well. The Yanmar
agent told us that we should replace the whole cone clutch
assembly which is very expensive. So with a bit of dexterity and a lot of thought we have solved
If this non/partial engagement of the cone clutch is allowed to persist for a period, it will lead to damage of the cone and seat assembly, which in turn will lead to slippage of the cone clutch.
I suspect that a lot of the failures /slipping of the cone clutches originate from partial engagement, and with not enough attention paid, rapidly leads to cone failure.
Once the cone and seat have made contact under load, and stay under load, slippage can not occur, due to the friction between the two conical faces.