The Yanmar conversion




adapter.jpg   A simple sketch of the adapter





The crank on the old engine 

The hardest part was to fit the sun gear sleeve to the engine shaft.
On the old MAG engine was the sleeve fitted with a taper and a woodruff-key to the shaft. The Yanmar shaft is straight 25 mm dia.




One long bolt holding both sleeves



 The adaptersleeve

I thought the simplest method was to make another sleeve with a straight inner fit to the engine, and a tapered fit to the sun gear sleeve. I asked a local machine shop to make that sleeve of ordinary shaft steel.



Ready to slip into the tranny