Since the repair of a maintenance-free coolant pump is difficult and time-consuming, the faulty pump must be replaced with a new one. The coolant pumps of 8-cylinder engines cannot be repaired, because after the pump bearings are pressed out, a tight fit of the new aluminum housing bearings cannot be achieved.
Because Since the pump is fitted with sealed, self-lubricating bearings, additional lubrication is unnecessary. Check the bearing for wear and roughness. Check the impeller for corrosion and damage. If damaged, replace the pump with a new one.