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Old 23-05-2022, 10:45   #1
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Please help identify damper plate

Hi,

my damper plate is shot, that is: the teeth have been stripped, so that no power is transmitted to the saildrive.

There was some custom work going on here as a previous owner had adapted a chinese engine to a Yanmar SD20. But I hope that the plate is still a standard part that does not have to be custom built.

There is a mark that seems to say BA51 on the damper.

Does anyone have an idea, who might have build these plates? The installation was done by a Swiss guy in Germany, so probably he sourced them in Europe.

Paul
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Old 23-05-2022, 19:43   #2
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Re: Please help identify damper plate

Looks like an R&D brand. Joe

Quote:
Originally Posted by toolbar View Post
Hi,

my damper plate is shot, that is: the teeth have been stripped, so that no power is transmitted to the saildrive.

There was some custom work going on here as a previous owner had adapted a chinese engine to a Yanmar SD20. But I hope that the plate is still a standard part that does not have to be custom built.

There is a mark that seems to say BA51 on the damper.

Does anyone have an idea, who might have build these plates? The installation was done by a Swiss guy in Germany, so probably he sourced them in Europe.

Paul
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Old 23-05-2022, 20:22   #3
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Re: Please help identify damper plate

That was my thought, too.
See their offerings here http://www.randdmarine.com/downloads/RandD_Damper.pdf

They can make pretty much anything you need if you supply horsepower and RPM, flywheel bolt circle and transmission spline.

You stated the spline teeth are stripped but they look OK in the picture. Does the transmission input shaft only engage part way through through the center hub of the damper?

Stripped splines really shouldn't ever happen unless something is wrong, like the bellhousing doesn't align the center/axis of the transmission with the center/axis of the flywheel, or spline engagement is way too "shallow".
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Old 23-05-2022, 22:57   #4
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Re: Please help identify damper plate

Yes, the shaft only went about halfway into the damper plate. All teeth in that area are completely stripped. The other half is untouched.

When I reinstall it, I will check the alignment of the engine block.

I will try to build a spacer to push the dampler plate further back, so that more of the shaft can engange. I guess it is supposed to engage 100%?

Paul
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Old 23-05-2022, 23:11   #5
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Re: Please help identify damper plate

Quote:
Originally Posted by toolbar View Post
Yes, the shaft only went about halfway into the damper plate. All teeth in that area are completely stripped. The other half is untouched.

When I reinstall it, I will check the alignment of the engine block.

I will try to build a spacer to push the dampler plate further back, so that more of the shaft can engange. I guess it is supposed to engage 100%?

Paul
Paul, may I suggest that you find someone that specialises in building and refurbing damper plates and work with them towards supplying one that fits your needs correctly, adequate spline connectivity and load capacity etc. Would be time and money well spent, IMHO.
Cheers.
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Old 24-05-2022, 08:50   #6
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Re: Please help identify damper plate

That is 100% an R&D brand plate. The part number is not written in ink. It is stamped on the face of the plate near the perimeter.
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Old 24-05-2022, 13:26   #7
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Re: Please help identify damper plate

Yup, it is a R&D plate.

I found the stamped part-number today, when I had it out in the sun. They will provide me with replacements for the more than 20 year old ones and I will install them with a spacer so that more of the shaft engages and we will double-check the alignment.

Thanks for the help!
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