1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 416Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 416

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SEAWATER COOLING SYSTEM
1 Clean gasket surfaces on water pump and cylinder block2 Inspect water pump for blockage, cracks, sand holes, corrosion or other damageInspect pump impeller for cracks a