Yanmar SB12-Documentation

Having browsed the entire internet I have found the following documents:
(still hoping to find the service manual)

Yanmar S Series
Vertical models, updated two times with the SVE engines followed by the SB. Single cylinder, 2:1 or 3:1 transmissions, sea water cooled, heavy duty. This series includes the following engines:

Engine HP Years In Production Comments
SB12 12 1976 – 1980 B=Between
SB8 8 1976 – 1980 B=Between
SVE12 12 1974 – 1976 E=Early
SVE8 8 1974 – 1976 E=Early
Yanmar SB12 Operators Manual
Yanmar SB12 Operators Manual
.
Yanmar SB12 Parts List
Yanmar SB12 Parts List
.
Yanmar YSE (and YSB) Service Manual
Yanmar YSE (and YSB) Service Manual
Closest service manual I’ve found.
Yanmar YSB Illustrated Parts Breakdown
Yanmar SB12 Illustrated Parts Lists
Good for part numbers to search the internet.