Quote:
Originally Posted by shadrach74
The way you say that implies that bits of metal are somehow more damaging than bits of plastic. Metal or plastic impeller, it seems to me the result would likely be same if it broke into bits small enough to make it in to the cooling system. I've had one impeller fail in a non-Pcar (Lexus), it was plastic and it simply split in half.
Whats the thought behind bits of metal in the cooling system being worse than bits of plastic?
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The engine block is the housing for the water pump. If the bearing fails and the blades contact the housing, the impellar fins break if they are plastic, the engine block is destroyed if they are steel.