Mercury Marine 89984 Water Pump Impeller

The Mercury 89984 series water pump impeller is a critical cooling system component designed for Mercury and Mariner outboard engines ranging from 65 to 225 horsepower, as well as MerCruiser Alpha One sterndrives. The impeller features a 6-blade neoprene rubber construction mounted on a brass hub, ensuring efficient water flow and corrosion resistance in both freshwater and saltwater environments. Key dimensional specifications include an external diameter of 59.60 mm, overall height of 33.60 mm, and an internal shaft insert diameter of 22.40 mm. The part supersedes earlier 47-89984 revisions and is interchangeable with Quicksilver 89984T3, 89984T4, and 89984T5 repair kit configurations. Aftermarket cross-references include Sierra 18-3017, Mallory 9-45306, and GLM 89840.