1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 501Get this manual
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VALVE MECHANISM REMOVAL IRemove rocke rm cove r(s) as utlined2 Remo ve roc ker arm tud nutball unit and rocke arm INSPECTION Che rocker arm padside rails and bal eat for xcessive wearc rac ksnick or b