In my collection of stuff there is a binder with the 1.Westerbeke parts list for Marine engines 13.21.27.33 and Diesel generators 4.4,7.7,11,12.5 kw(Pub 32139 Dec 1983)  AND 2.the Operator's Manual for 13A.18.21A.27A.33A Marine Diesel engines. (Publication 36195, July 1986)

For the price of postage, they can be yours. Email me if interested