Here is another picture of a damaged Mazda water pump.
I initially thought this was caused by cavitation but
after seeing Perry's destroyed pump I suspect this
one was also damaged by running it low on water.

Note: Only the upper half is damaged along a horizontal
line. Just like Perry's pump. This is from an engine I
bought in the junk yard.

I am beginning to think this is were the myth of Mazda pump
cavitation got started.

Paul Lamar

It could also be debre damage from lime/calcium etc in the water.
Royce

 
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