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      09-19-2020, 10:53 PM   #5
440MIA
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Drives: 2018 440i Grand Coupe LCI
Join Date: Aug 2018
Location: Miami

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Quote:
Originally Posted by weehe126 View Post
The water pump is mechanical, not electric on B58s I thought. So there isn't a way it would keep spinning with the engine off. They probably keep saying it's eccentric shaft/servomotor related because this was an issue with N55s. Did they just replace the servo motor or also the eccentric shaft?
The B58 has 3 water pumps (that I know of). One of them is mechanical and the other two are electrical pumps. One of the electrical pumps is for the charged air to water cooler intercooler in our intake plenum. The second electrical pump is for cooling the turbo. Also, if you get the turbo hot enough and turn off the car, the turbo pump will stay on to cool it down.
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