Re: yanmar manual crank?
If you have a 3GM20 Rather then th, You mige 3GM30 You might want to try. Most used marine chandleries eventualy come up with a crank.
If not a welder can make one frpm a pipe or rod the right size, welded to a peice of bar stock, with a bolt inside a pipe welded on to serve as a handle, slotting of 90 deg on either side R or L for direction.
as to the 3 GM 30 F, the nearest one is 2 slips over & its 11 PM. If I remember ther is a belt gaurd, blocking the normal crank access, which is capted.
I'm not quit as crazy as I used to be, But I think it could be done.
But as I said when I went to pick up a 40 cruising catch, for the sea scouts, & found the starter was bad, Any mariner worth his salt would have a spare and it should be in this drawer here. It was one up.
Ifyou don't want to get a hole starter used, Get a new Cylinoid. my 2QM15 Cylinoid is used by several manafactures. the cheapest sells for about $14