A couple of years ago I tried to get a Bukh workshop manual as a download from the web without success (could get owner's
manuals, but not workshop manuals).
I'm sure you're aware of Bukh
Diesel Uk Ltd (Tel 01202 668840 in the UK) - they will obviously be able to sell you a workshop manual via any one of their main dealers.
There are also a few Bukh dealers in the
USA and
Canada - although they predominantly serve the lifeboat market you can bet workshop
manuals in
English would be mandatory for that market.
If you don't mind, let us know if you succeed in getting a soft copy anywhere.