Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 160Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 160

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Crankshaft 1 Thoroughly clean crankshaft and inspect bearing surfacesReplace crankshaft if bearing surfaces are pitted, scored, or discolored
IMPORTANT: Do not interchange the main bearingsReins