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Old 20-10-2017, 16:19   #1
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Yanmar SD40 & SD50 "slipping" Saildrive Upgrade

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ID:	158083Preventing Cone Clutch "slipping".
Some pics showing the SD40 and SD50 Upgrade, part of which incorporates new larger diameter Thrust Bearings and associated components, replacing the original Yanmar Copper thrust washers.
Also showing a previously smooth shiney "slipping" Cone Cup surface in the front, compared to a dull "lapped" Cone Cup surface behind it.

For info or assistance, e mail; saildrives@yahoo.com
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Old 21-10-2017, 01:02   #2
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Re: Yanmar SD40 & SD50 "slipping" Saildrive Upgrade

Can you elaborate on this post I've had my 50's apart and re-lapped both. The washer spacers I recall were hundredths thin, a combination of these was required to obtain an exact tolerance
I don't recognize the bearing in the first picture. I'm certainly interested in a permanent fix as I'm thinking another 300 hours I'll be back in mine again.
Aloha
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Old 22-10-2017, 05:39   #3
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Re: Yanmar SD40 & SD50 "slipping" Saildrive Upgrade

We have developed an Upgrade Kit for the SD40 SD50 Cone Clutch assy.
The Thrust Bearing and Collar assembly shown in the pic is part of a number of new improved components in the the Upgrade.
The Shims you are referring to, do not serve the same purpose as the Thrust Bearings. The Shims are all about Gear Mesh and Backlash adjustment.
Thrust Bearings are fitted in place of the original Copper washers below the Top Nut and Lower Collar on the upper Vertical Shaft, and other than acting to absorb the load induced by the spiral cut splines, control the free play of the Vertical Shaft.
The Upgrade also addresses the Selector adjustment and simplifies the adjustment Prucedure, which is important, but normally ignored!

Feel free to contact me on; saildrives@yahoo.com for more info.
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