WATER PUMP KIT 821354A2

Function and technical context

This water pump repair kit is a complete set of wear items designed to restore cooling system functionality in Mercury 2-stroke and 4-stroke engines. The water pump constitutes the central component of the cooling circuit, propelling water through the internal galleries of the engine to dissipate the heat generated during combustion. A failure in this pump causes immediate overheating of the propeller, with the risk of crankshaft seizure, irreversible damage to the cylinders and total loss of power during navigation. This kit contains replacement parts specifically calibrated to restore original operating tolerances.

When to replace this part?

Symptoms of wear on the water pump include coolant leaks around the shaft, reduced flow of water expelled from the discharge tube, or frequent activation of the thermal alarm during navigation. It is recommended to inspect the condition of the pump impeller and seals each boating season, especially after operations in water with sediment or high salinity. A preventive replacement of the repair kit before reaching obvious symptoms avoids unexpected breakdown at sea and guarantees stable cooling cycles throughout the navigation campaign.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers