TD42 water pumps... what would you be prepared to pay
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John is right. Cavitation will usually only occur at sustained high rpm. Cavitation is usually a supply issue so there is not enough water available to be pumped.
Machining will help to increase flow but is not enough of an increase to cause problems. It is still within the control of your thermostat and cap.
You dont have to machine it. You can just replace it with a new one.
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