1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 733Get this manual
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4fnspecl sea ling ri ng on pisLon and "0" ring on piston orn(Figure 3) housing and replace if cut or 5 Ch eck hearing in piston housin for roughness and exc cssi ve playNOTE: Be sure that piston housi