Where are you located? My buddy's buddy has a D6B which is probably going to the scrapper. Engine was allegedly resleeved and the owner ran it for some unspecified number of hours and then parked it over winter. Engine seized (not even a crow bar on the ring gear will turn it) and owner said he drained gallons out of the crankcase so the crank is probably seized to the bearing shells. I suspect the rebuilder omitted a seal or something because the exhaust pipe had a cap on it. Anyhoo, it's in Rochester NY.