1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 680Get this manual
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REMOVAL NO E: Engine must be removed to rem-Due transmissionRe fe tion 2to
9 Remo ve screws and lockwashers, va ve cover and gaske tTap ou valve assemb ly (Figur 4) 10 Remove cap screws from oil