The water pump in my newly installed Yanmar failed after 240 running hours.
The impeller was broken into several small pieces , and a groove of 0.5mm depth was formed in the brass cover plate . It is rather unusual for such short running hours, I suspected that the direction of the impeller was installed in a reverse direction resulting excess stress on the rubber material. I found several equivalent product other than the Yanmar product . One of the best is from Johnson pump serial no 09-1077B-9 made of Nitrile.
The impeller was broken into several small pieces , and a groove of 0.5mm depth was formed in the brass cover plate . It is rather unusual for such short running hours, I suspected that the direction of the impeller was installed in a reverse direction resulting excess stress on the rubber material. I found several equivalent product other than the Yanmar product . One of the best is from Johnson pump serial no 09-1077B-9 made of Nitrile.
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