1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 353Get this manual

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PUMP ROD ADJUSTMENT 1 Back off idle screw and llow valvcs to close Distance from top of air horn next to pu mp plunge bottom plunge haft should be 1- 1132(26 2mmBend pump rod to adjust(Fi ur 22) 3 Rea

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