Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 396Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 396

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NONBIGFOOT GEAR HOUSING
1 Inspect pinion gear teeth for rust, chipping, excessive wear (teeth are sharp edged) or broken2 If pinion gear teeth are damaged, also inspect forward and reverse gear