WATER PUMP BASE 46-96146A6

Function and technical context

The water pump base is the structural component that houses the impeller and internal elements of the water cooling system in Mercury and Mariner marine engines. This piece is part of the forced cooling circuit, responsible for extracting heat from the engine block through the constant circulation of water from the outside to the internal chambers. Its deterioration or corrosion compromises the tightness of the system, causing coolant leaks, entry of salt water into unwanted spaces and, ultimately, overheating of the engine with the risk of seizure. It is a critical component in saltwater vessels, where corrosion accelerates wear.

When to replace this part?

Signs of failure include water leaks around the pump base, visible corrosion deposits on the surface, engine temperatures above normal for no apparent reason, or the presence of rust and rust affecting the bond with the block. It is recommended that the pump base be inspected annually during seasonal maintenance, especially on heavy duty or saltwater vessels where the electroplating deteriorates more quickly. Preventative replacement of this base during major maintenance prevents emergency repairs in the middle of the sea and prolongs engine life.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers