Good morning,
       I guess I am not surprised that you didn't get my previous E-mail, I often hit the wrong button somewhere along the way and the next thing I know it has disappeared! It may still be on the computer somewhere, oh well. It sort of amuses me.  
    I had one other question about a port on the left side of the oc-3 engine located just forward of the starter. It is a machined oval area with a 3/8 threaded bolt hole on each side of the port. It looks like it should be where the lower radiator hose should attach to the enginne, but it has(had) a freeze plug in it. The cooling system is different in that the water pump has a pipe running back toward the operator and then downwardbetween the starter and generator, where there is an in-line block heater installed and then the pipe turns 90 degrees again and back into the lower radiator connection. It is so roundabout that I can't believe it is original. My guess is that the lower radiator connection ran straight back and into that port I mentioned above. If this is so, I would guess that the remains of the freeze plug will have to come out and there must be a 90 degree fitting that bolts to the side of the block which would accept a radiator hose. Does this make sense?
    A final question and you may well roll your eyes at this one, but it is one that I can never keep straight...is the OC-3 a Hercules or a Continental engine?   Some things I don't seem to keep straight in my mind and this is one of them( at least it isn't my wifes name confused with an old girlfriend... that could be fatal!)
  All the ID plates are missing, naturally, so I don't know. There is a casting date of 2-26-53 on the clutch housing so that would date the machine pretty well. I do know that it is an OC-3-42
   There is both green and yellow paint all over it so I am not sure what color it was....so it is gonna be yellow! When I was younger (30 years ago) I worked winters skidding white pine logs with an oc-3. I sure liked that little machine in the woods,it was so manouverable. 
                             All for now
                                   Cal