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Measuring efficiency of Water Pump?


Guest wally888
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Guest wally888

Is there standard or chart depicting the normal flow caused by a running Water Pump and a simple way to measure it's performance?<BR> Do Water Pumps just fail completely or.....?

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Not quite sure what you are wanting. Flow has always been "enough" given proper thermostat operation & no restriction in system. (recent tests have shown that restriction is not necessary - source: Speedvision). The general failure mode of a water pump is either seal failure around the bearing causing a leak or occasional failure of the bearing itself (also causing a leak but incidental). Since the "pump" is just vanes spinning in a cavity, it rarely fails however have seen collapsed return hoses (on bottom of radiator - one with spring to prevent collapse - cause restriction -> overheating.

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I have heard of pumps loosing their efficiency due to slipping impellers but in a bunch of years working on cars I have never removed one that has come loose on the shaft. Has anyone else seen this problem?

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