WATER PUMP REPAIR KIT 46-42089A5

Function and technical context

This repair kit is designed specifically for the water pump of small power Mercury engines, an essential component of the water cooling circuit. The water pump is responsible for circulating coolant through the internal galleries of the engine, absorbing the heat generated by combustion and keeping it within safe operating ranges. The kit includes all wear components necessary to fully restore the functionality of the pump, such as seals, seals, impellers and other elements subject to constant friction. Without adequate cooling, the engine would suffer progressive overheating, with the risk of piston seizure, cylinder head deformation and catastrophic engine breakdowns while sailing.

When to replace this part?

Typical symptoms of water pump deterioration include visible coolant leaks around the shaft or housing, decreased water flow (easily detected by the weaker discharge water jet), visible corrosion on the impellers from exposure to salt water, and a high temperature warning on the instrument panel. It is recommended to review and consider replacing the repair kit every 2-3 seasons of intensive sailing, or preventively if any signs of corrosion or minor leaks are detected. Replacing the kit preventively is an economic investment much lower than the cost of an engine failure at sea or during a voyage.

Mercury engine compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers