1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 204Get this manual
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BRUSH REPLACEMENT Replace ;; ta rter bl1 Jshes when worn to !-:i(6.3 Smm )Always in stall com plete se of new brushes ILoosen and remove bru cover bandgas ket and sta rte dr 'e plunger Ie cover Re mov