Originally Posted by dan swift
i have an sd40
and have big suprise a cone clutch problem. i did everything it says to do regarding the lapping of the cone put it back together and it still doesn't work?? any ideas what i might have done wrong? other than buying
a boat with a yanmar sail drive.
I did answer to your posting
on the forum.
The problem originates with too much up/down play of the Vertical Shaft, this combined with the limited travel of the Selector causes the Male Cone to only partially connect with the Female Cone before the Selector retracts.
This partial engagement causes slippage between the Cone surfaces, and the situation deteriorates from here.
The partial engagement is sometimes not apparent, especially under light loads. The prop seems to spin, but is not delivering the full thrust. "Blippin/revving" the trottle in gear sometimes makes it engage fully with a clearly felt/heard "Clunk"
We have developed a Rework Kit that replaces the Yanmar Copper thrust washers with Thrust Bearings (similar to VOLVO), and also replace the Yanmar Selector washers/shims with an adjustable Set Screw and Locknut.
The Thrust Bearings and Set Screw allow a much closer initial set-up tolerance, and has reduced wear.
The Rework Kit also makes provision for a Vent for the saildrive
, allowing it to "breathe", reducing the possibility of seal failure at the Engine
Input and Prop shafts.
The Rework Kit consist of;
New (bigger dia) Lower Collar
New " " Top Nut
2x Thrust Bearings
3x O- Rings
Vent barb fitting
Vent rubber tubing
Vent end filter
Complete rework procedure based on the Yanmar lapping ans service
We also have a Spline Holding Tool available to make the Top Nut removal/fitment easier.
Feel free to contact me if you require more info
We have developed a Rework Kit that