Please Help Identify this Engine

[bbbbbguy]

I need a hand identifying a Yanmar engine. Before you laugh your keel off at the seemingly simple, please read on...

I can't positively identify this Yanmar. The data plate states "RCD 4JH4x1". I know the RDC, and the 4JH, but can't identify the X1 part. I believe this is an engine out of a production cat with sail drives. I also believe it to be 39.6 KW.

I can't locate a for sure source for this information. You Yanmar Guru's out there might be able to give me a hand.

I am primarily interested in the ability to bolt the transmission off a 4JH4DTE on the X1 block.

If you have any information on these two issues, please put down your Carib or Stag, and drop me a note.

SV Kush really appreciates your assistance...
Dave