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Re: Metal water pump versus plastic (archive)

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Posted by Jone T. on December 12, 2000 at 10:38:03:

In Reply to: Re: Metal water pump versus plastic posted by Rob Anderson on December 12, 2000 at 04:40:28:

BMW originally used the "plastic" water pumps in the M50. The only plastic part is the impellor(sp?). What happens is the plastic degrades over time and then starts to break. Also under high heat conditions, it does not fair as well as metal. When the plastic breaks the plastic bits go into the cooling system and block it up.
The "metal" water pump has a metal impellor(sp?). This allows it to last longer and also does not degrade like the plastic ones. Personally if I owned an M50 or any BMW with a plastic water pump, that would be the first thing that I would change, no matter what.
Hope this helps

Rob A
M535i SIG Technical Advisor

Is it possible to determine which pump one have without removing it completely from the engine, and if not, are there any pitfalls to this job?

Jone T.

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