Since they don’t have a water pump and rely on boat movement and the propeller to force cooling water thru them, there is a way to test run them on a stand. On the bottom of the cylinder is a fitting or plug which can be removed and a fitting for a garden hose can be installed instead. They need the 8:1 mix because of the large rotary valve on the crankshaft. John Deere Cornhead Grease or Lubriplate will work in the gearcase. They have cork type seals on the prop and drive shafts which are probably worn out by now but the prop shaft bearing housing can be machined to accept a modern lip type oil seal. I did this on my KA 37 so I can use gear oil instead of grease.
http://www.greenpartstore.com/John-Deer … 02562.html
Here’s the outer half of the rotary valve showing the grooves where the sealing rings fit in.
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