1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 261Get this manual

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2 Lift motor from end capUse care not to drop armature CHECKING AND CLEANING COMMUTATOR 1 If commutator is worn, it may be turned on an armature conditioner or lathe2 Clean commutator with "OO" sandpa

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