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Old 10-06-2012, 05:19 PM
e36Jeff e36Jeff is offline
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Location: MD
Join Date: Feb 2011
Posts: 7
Mein Auto: '04 330i ZHP 6MT
I had forgotten to update this with the final fix. The bearing of the water pump, which was newish and OEM was not quite perpendicular to the body, inducing an extremely minor wobble in the fan, not enough to look like an issue at idle, but when the engine was at high RPM, could induce an impact between the fan and the shroud at the top of the radiator, which would the shatter the blades off the fan. That water pump shattered 3 fans. I replaced the engine mounts after the first fan, the fan clutch and transmission mounts after the second, then the pump after the third. The error in the bearing was slight enough that it took me 5-10 minutes of comparing the old and new pumps to figure out what was wrong.
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