Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 387Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 387

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NON-BIGFOOT GEAR HOUSING
aSealBolt (4)
NOTE: Replace cover if thickness of steel at discharge slots is 0.060 in(1.524 mm) or less, or if groove(s)(other than impeller sealing groove) in co