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remove the old impeller from the pump housing
A common sign of failure is water intrusion into the gear lube (milky or creamy-looking oil) or gear lube leaking out of the stern drive unit
The best way to confirm fitment is by matching your existing impeller's part number to the ones listed in our Part Number Matrix
including specific Mercury
Transom Seal – Fits MerCruiser Alpha One, R, MR, MC-1 (1983–1990) (Replaces 65533A1) 210HP remove the old impeller fromProduct Details This Transom Seal Fits MerCruiser Alpha One, R, MR, MC 1 (19831990) (Replaces 65533A1) is designed for MerCruiser Alpha One Generation 1, R, MR, and MC 1 stern drive models from 1983 to 1990. It is engineered to create a durable seal between the gimbal housing and the transom plate, preventing water intrusion. This component is a direct cross reference for MerCruiser 65533A1, GLM 86712, and Sierra 18 2692, ensuring precise fitment and
