Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 237Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 237

CYLINDER BLOCKCRANKCASE
3Remove crankshaft and oil seals
aCrankshaftUpper Oil SealLower Oil Seal NOTE: Do not interchange main bearings, re-install in their original locations4Remove main bearing halves from crankcase cover and cylinder block

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