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Old 03-19-2014, 01:15 PM
racingbmwm3 racingbmwm3 is offline
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Join Date: Sep 2012
Location: Port Townsend, WA
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Problem corrected by the new style composite impellers, as found on the Saleri pump.

I've never seen a waterpump catastrophically fail to where it could cause engine damage except on the E36's; plastic impellers AND 1 metal impeller with a bearing failure that caused the metal impeller to impart significant damage to the pump chamber in the head. On the V8, and most other pumps, the pump will start leaking coolant as the first sign its on its way out. Then it will start making noise. It should be replaced before it starts making noise.
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