another dead boxster @#$%!

[Jake Raby]

Originally Posted by demick

I've not seen any confirmation that the Jake waterpump has a metal impeller. I've seen the question asked several times, but never answered.

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.

Excellence is going to cover the water pump issue in an upcoming issue, I spoke to the Editor yesterday and he told me that they'd be in touch for my data.

[Frodo]

So Jake, back to tnoice's question (specifically with regard to the AOS):

"So question is, would you include changing out the AOS every 60-80,000 miles AND the water pump a good precautionary measure, or is it not needed. Run it till it breaks?"

And (directly related to that question) are the early symptoms of AOS failure (mentioned in my last post) pretty reliable indicators that one can wait to see/hear, or should the AOS (like the water pump) just routinely be replaced after a certain number years? If it (the AOS) should be replaced based on age alone (ie, before any signs that it's failing), how long should we go between replacements?

[Jake Raby]

The best policy is to NEVER wait for the components to fail.. Doing so ALWAYS costs more money.. If nothing else you end up spending more money due to a tow bill and inconvenience and thats if no secondary failures occur or complete engine loss.

Waiting for things to break is never the best answer.

[Frodo]

Sooooo, how often? Every 5 years? 4? 3?

And just go ahead and replace the AOS whenever you replace the water pump?

Thanks, Jake.

[Steve Tinker]

Frodo - I've read on this board of new AOS units failing within a few hundred miles, so its one of those imponderables that can vary.
As with anything manufactured with plastic and "rubber" (nothing is rubber today), everything depends on exposure to max & min heat cycles, time, engine usage, acidic value of old oil attacking the plastic (as per IMS bearing seals), etc, etc, so I think your question cannot be answered easily.
Personally, if you check your oil cap vacuum weekly, look & listen for squeaking and smoking on startup and once a year inspect for excess oil and clean out the throttle body you won't go far wrong.
If there is no history of AOS replacement, THAT'S the time to replace it before it bites you on the a$$.

[Mark_T]

Right then, I'm sold. I'll start off next season with a new AOS and water pump.

Couple of AOS questions, though. I'm looking at the Pelican catalog and note 2 says that all models up to '99 engine 65X 01419 also use 996.107.145.06.M100 vent line and 999.707.446.40.M100 o-ring.

Is this the j-tube that I have see mentioned that should be replaced with the AOS?

My car is a 99, put in service Sept. 98. Is that info enough or do I need to find this number on the car somewhere to see if these are the right parts? If so, where?

Mark