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Never ever put a metal impeller pump in an engine block no matter what engine it is. If that bearing fails then you have thousand of metal bits now making your way round your coolant system as well as reshaped ports around the pump.
As for when to replace a good rule of thumb is every 40000 miles or 4 years. That's what VW recommends on their pumps and i reckon that's not a bad shout.
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