Quote:
Originally Posted by Smallblock454
If a failing water pump with metal impeller grinds into the case house, you'll have metal in your water system - means water cooler and hoses.
Not in the engine oil system or inside any moving parts or bearings! It's just in the water channels or cooling lines or water coolers.
Same to plastic parts.
The question is: are fine metal parts better or not so fine plastic parts.
After some thinking i would prefer fine metal parts.
Regards, Markus
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They both can block critical small passages, leading to hot spots. The major difference between the two is the permanent case damage metal impellers can do, which leads to cooling problems even after everything is cleaned out. Clean out the plastic, install a new pump, and it is as though nothing happened.