RP, not sure what the torque specifications for that plat is, but below is a excerpt from the discussion concerning my replacement. Maine confirmed the proper Sachs part # of 1866-050-02. The entire thread can be found at:
http://forums.catalina.sailboatowners.com/showthread.php?t=113844&highlight=damper
Maine Sail 11-17-2009 03:15 pm Witz,
I just made a call to the distributor who ships the engines to Catalina and whom I get my Universal/Westerbeke parts through.
The R&D damper plate was stock, and factory, however according to the distributor
"We had nothing but problems with them and most of them failed and some caused more damage than good"
I never knew Universal used anything but Sachs but apparently they did try some R&D's...
The spline fit was most likely spot on but as it failed it began to eat at the splines. The replacement Universal/Sachs damper plate is a Universal part number U-299156. I had them pull it off the shelf and read me the part numbers. The Sachs number is a 1866-050-002."
Ray, my point here is that you may be experiencing increased vibration due to a plate that is too stiff. It is the damper plate's function to smooth out rotational vibration that is present in light fly wheel low cylinder count engines like ours.