water pump

[Soetekouw]

Does the replacement water pump have non-plastic impellers? Or are we just replacing one pump for another pump with the same plastic impellers? So, if we bought a Porsche OEM pump, what are we gaining?

[tonycarreon]

i think most feel the plastic is superior than the metal in this case, as the metal will expand and cause leaking.

but it's possible i'm crazy and thinking of sonething else.

[JTP]

From a thread in October:

Originally Posted by Jake Raby

I am not selling a water pump with a metal impeller.. The main reason is IF the bearing in one of these units goes bad it will chew into the engine block and destroy it.
At the current state of development using a quality pump with a plastic impeller, but changing it out every 2-3 years is the best policy.

[urban_legend]

Here is what a "lightly" used pump looks like.

[jaykay]

Originally Posted by urban_legend

Here is what a "lightly" used pump looks like.

okay...... that got my attention!

[Idaho Red Rocket 3]

You are correct KPM, I did make a mistake on the price for the new water pump from Napa. Their web site says it is $154. I think my local store quoted me the $158.

So the question is still unanswered. Has anybody tried one of these from Napa ?

Will I be the first to do so ?

Also, Please help me understand the reason the 160 degrees thermostat is better than the 190. It is my understanding that an engine not up to at least 180 degrees does not opperate at peak efficiency. Give me a little more detailed information so I can give my car the best treatment too.

[Soetekouw]

So, if I get the gist of this thread, we replace the water pump with a Porsche OEM pump (plastic) impeller (JTP) every 2-3 years (Jake).

Well, I guess I am due to replace mine (4 years). Who has the best price on a new OEM pump. My Boxster is a 2007. What do you think it will cost me to have the dealer replace it?

[Mark_T]

I know this has been said many times before, but also look at changing your front motor mount at the same time.

[jaykay]

Yes......I keep hearing this and always wonder what the deal is. I suppose there is a huge polymer section to it and it is susceptable to embrittlment over time? I am at 11 years and have never felt anything like the engine shifting around. I guess I would have to be out of the car and maybe have a look. Is there a 997 upgraded mount that all are using? Is it fair to say that there is no additional labour in getting at the mount while you are at the pump? I would like to do these myself if they are feasible using jack stands....