[Nickshu]

Originally Posted by JackDidley

I understand the theory but Ive never seen a post where the pump actually hurt the block. I am sure it has happened but what are the odds ?

So in the end your choices are use a metal pump and replace it preventively to avoid block damage or use a plastic pump and replace it preventively to avoid the impellers breaking off.

Same same I guess. The metal pump failure being higher risk than the plastic pump failure as far as expensive damage. But you are right neither happen often really. All M96/97 gurus recommend preventive water pump replacement so it's pretty much the standard for maintenance on these engines either way.

I replaced mine last summer on my 996. After considering both options I went with a plastic pump. The first pump made it 14 years and 22k miles... Looked fine when it was removed.

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