PUMP PLATE 663-44323-00

Function and technical context

The 663-44323-00 pump plate is a critical component of the cooling system of Yamaha and Mercury outboard motors. This part acts as a direct driver of the water pump, transmitting the rotational movement of the crankshaft to the impeller that circulates cooling water through the engine galleries. Its correct operation is essential to maintain optimal operating temperatures; Any wear or tear on the plate compromises coolant circulation, causing immediate overheating of the engine and possible thermal damage to the cylinders and cylinder head.

When to replace this part?

The pump plate should be inspected regularly during seasonal maintenance, especially if you detect abnormally high temperature indicators on the control panel, reduced discharge water flow, or unusual vibrations in the engine block area. Although there is no fixed change interval, it is recommended to replace it preventively if it presents visible cracks, deformations or wear in the coupling areas with the crankshaft. Changing the dish preventively when signs of deterioration appear avoids breakdowns while sailing and protects higher-value internal components.

Compatible engines

Equivalent manufacturer part numbers