1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 30Get this manual
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TRIM TAB REMOVAL and REPLACEMENT I re movin lrim tab mark traili ng edg cation on cavitation plat and remove plug which is loca ted direc tly abov trim tab (Figure 3) Loo cnerwhieh ho ld trim tabthl1.