1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 45Get this manual
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VA LVE AD JUSTMENT MERCRUIS ER 60-80 90
5 Repea te ps 2, and 4, ahovto adj ust rest valves
6I.nstall va lve cover(s) with new gasket(s)if necessary
OTE: Followin procedure, erf orm e