Quote:
Originally Posted by Aleman
Plastic weakens with every heating cycle. Plastic inside my water pump makes me the most uneasy. Looking around my engine bay, I'm happy to see the coolant pipes are metal or rubber hoses. I've had some expensive and inconvenient problems with the plastic cooling system on my Mini Cooper, so looking to harden the systems in all my cars if possible.
Has anyone had an issue with a broken water pump due to cracked plastic parts?
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plastic water pump impellers have not been a thing since the M52 engines. Since then, metal impellers were then phased in when M52tu engines became available in 1999MY.
Composite impellars became the standard early 2000's and have been since then.
I have yet to see a composite impellar fail on any BMW. The bearings are the problem.
What you should do is replace the
Crossover tube, water pump, thermostat, valley pan, expansion tank, cap and all hoses that go to and from the tank, radiator and water pump. These parts will usually last a good 60-80k miles. The tank might not, as some i've found when new they have issues.