1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 500Get this manual
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ROCKER ARM COVER REMOVAL
2 Appl pres ure on va lv lift with ool 6-13
(Figure 3) wl ble lilt until plunger co mpletely bo ttomed3 Ho ld va lv lifter in fulllap cd positi and check