There was some concern about this being a 'YN' engine and not a 'RD' engine when it first arrived at the shop. If a 'YN' engine has a 8409 crank in it, it the same as a 'RD' engine and all is well.
I spent an hour removing items from the top of the engine so that I could pull the top plate and see if the crank had '8409' stamped on it.
