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I received my replacement water pump for e24 635csi M90 (#). The part number ordered was (part I received was labeled I don't believe an issue).For more information, please visit impeller cast iron.
I've installed a few water pumps and they've always been the solid cast brass impeller. Everything I've always read says the cast metal is better than the plastic or pressed one. Where did you get it and what brand is it? You have to wonder if they use a cheap impeller whats the bearing like? I would recommend returning it and getting one with the cast impeller. My 2 centsIf you are looking for more details, kindly visit OEM cast iron flange.
I'd be curious about the drain and replace cycle for your antifreeze given the corrosion on the impeller. I read an interesting sales pitch for a power flush device for cooling systems that promotes the idea that floating corrosion particles cause the wear on the pump bearing leading to leaks and failure. As my car is not a daily driver, I wonder if the exhaustion of the anti-corrosives is more due to time (as it relates to galvanic action) or heat/cooling cycles. Sansouci