OMC Evinrude Johnson Water Pump Kit

The OMC Evinrude Johnson water pump kit 391391 is a repair kit designed for Evinrude and Johnson outboard motors, specifically those with 5.5, 6 and 7.5 horsepower. It re-places parts with numbers like 763758, 778166, 382797, and 389228. The kit typically includes a new impeller, housing, cup, wear plate, gasket, water seal, key, bolts, and washers.

Here's a more detailed breakdown:

Impeller: The rotating part that pumps water through the engine.

Housing: The metal or plastic part that encases the impeller and other components.

Cup: A component that helps seal the pump and direct water flow.

Wear Plate: A plate that helps to wear down over time to protect other components.

Gasket: A seal to prevent leaks

Water seal/key: Components that help maintain the seal and prevent leaks 

Bolts/Washers: Used for mounting the kit

Engines: 5.5, 6, and 7.5 horsepower Evinrude and Johnson outboards

Years: Generally for models from 1954-1979.