1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 712Get this manual
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UPPER DRIVE SHAFT and GEARS DISASSEMBLY I Press uppe driv 5haft fro lll driv('n gear and as (m bl y(figure )
1I'r,So l.wa ring onto driv(' and drh'1 mandrd with
"pper dri a'" rnbh