1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 159Get this manual
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INSTALLING STERN DRIVE UNIT CA TIOOle Engine lignment with En!tine Aligrunent haft (C-91.57797 1) before Installing tern Drive Unit
Figure 3lubricating Shift Lever Coupler
4 Align coupler