Quote:
Originally Posted by PINeely
N54 water pumps and N52 water pumps are identical. They're the same in the N55, 335iS and 1M as well. Only the M3 and 335d pumps are different in the 3 series.
How do you suggest calculating the number of hours run by each pump? As you said in a heat-sink situation mileage isn't the best data point but it is the only usable one really. From there you could split it into highway mileage or city mileage to account for the load times, but... too may people in here with cars they bought used and not knowing whether it was highway or city driven. Too many people who've had their cars since new and have driven a good mix of highway and city. Too many whose cars are FBO and are run harder, hotter, longer than a stock car. Too many people who let their cars idle for 30 minutes every morning under which circumstance lots of heat-sink and no mileage occurs.
Mileage is the only data point which is going to be standard across all of the pumps. Amount of heat sink is going to be different for every single car.
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I think you made my point, then. There is no good way to determine a predictable failure rate, which means waiting for it to fail is the best solution. BMW should have built in a failure warning in the CBS to notify owners of pending water pump failure. But then that would be a percieved quality issue.
BTW the pumps for the N52 and N54 are different parts. The P/Ns are: 11517586925 (N52) and 11517563659 (N54). Just for the record.