Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 436Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 436

BIGFOOT GEAR HOUSING
6Inspect impellerReplace impeller if any of the following conditions exist: Impeller blade(s) are cracked, torn, or wornImpeller is glazed or melted (caused by operation without sufficient water supply)Rubber portion of impeller is not bonded to impeller hub
7Remove plate and gasket8Replace plate if groove(s) (other than impeller sealing bead groove) in plate are more than 0.030 in(0.762 mm) deep

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