Impeller pump wear plates
The wear plate sits behind the impeller and provides a smooth surface for the impeller blades to run against. Not every seawater pump uses a separate wear plate, but where one is fitted, its condition can affect the pump’s ability to draw and move cooling water.
Over time, the impeller may wear grooves into the plate. Corrosion, dirt in the seawater and running the pump dry can also damage its surface. A badly worn plate can reduce the seal around the impeller, resulting in weaker suction and reduced cooling-water flow.
Choosing the correct wear plate
Wear plates can differ in diameter, thickness, center hole and mounting-hole position. Compare the original part number and pump model whenever possible. Do not select a plate only because its outside diameter looks correct.
Engines from the same series can sometimes have different seawater pumps. If the pump has previously been replaced, the engine model alone may not identify the correct plate.
If you are unsure, send us the complete engine model, pump number and clear photos of the existing plate and pump housing. Measurements of the old plate can also help.
Check the rest of the pump
When replacing the wear plate, inspect the
impeller and the pump cover at the same time. If one contact surface is badly grooved, the other may also be worn.
Clean the pump housing before installing the new plate and make sure it sits flat. Use the correct gasket or O-ring where required. After assembly, turn the pump by hand if possible and check for leaks and normal cooling-water flow after starting the engine.
Other shafts, seals and repair parts can be found under
water pump parts.
