Shut off the sea water inlet valve.

Remove the screws, cover, and gasket from the sea water pump housing.

Note the rotation of the impeller before removing.

Remove the spline seal and impeller.

CAUTION  If the impeller has failed, the heat exchanger must be flushed. Impeller debris can also drop into the pump inlet opening. Make sure all debris is flushed before installing the new impeller.

Inspect for damage such as rips, tears, or chunks of material missing.

Replace as necessary.

Clean the impeller housing.

Remove any old gasket from the pump housing and cover plate.

Check the housing for cracks or other damage.

If installing the used impeller, make sure that the impeller is returned to the housing with the same rotation as when it was removed.

Use clean glycerin, silicone spray, or non-petroleum-base lubricant to lubricate the impeller before installing it into the housing.

Install the cover plate and a new gasket if necessary.

Open the sea water inlet valve.