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In August of 2002 Westerbeke issued service bulletin 235 regarding failure of sea water drive tang on cam shaft on early "B" model Universal engines.
Westerbeke will ship you a new tang re-enforcement sleeve, that is installed on the engine side, free of charge along with gasget for the pump.
Contact Westerbeke by phone 508 823-7677 or email help@westerbeke.com
You must provide your engine model and serial number. For me not only they send the re-enforcement ring - they also send newly edited manuals for the engine all free of any charge.
Here is the PDF file for the Service Bulletin 235
In the photo above the sleeve has been installed
The part number is 48245