I know where your could get one made but I'm sure there are many out
there between the hurricanes and the fact that a lot of the raw water
cooled ones in S.W. are nearing the end of their life.
I have the same engine as well as the Service Manual. If you need
anything copied from the manual just let me know.
This seems to be a good source of Yanmar parts and info:
http://www.marinedieseldirect.com/
--
Roger Long