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Originally Posted by Smallblock454
Considered this aspect.
Problem is that the plastic parts in general are much bigger than the metal parts. OK, thin metal parts could affect the bearings of a new water pump. Big plastic parts can block thin water lines. And as we all know there is not only clear fluid in this lines. Over the years we get some corrosion and other dirt - even it's an aluminium block (and there is also aluminium corrosion).
Still on the metal impeller side. 
Regards, Markus |
You are overlooking the fact that even very small metal bits can agglomerate into passage blocking as well. We have seen it happen. And the case damage from the pump hitting is also permanent, which reduces the overall coolant flow in even completely rebuilt engines, so you have a fresh engine starting off with one hand tied behind its back.
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Last edited by JFP in PA; 03-16-2016 at 02:08 PM.
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