Water pump

ZetaTre · Post by **ZetaTre** » Mon Mar 31, 2008 11:36 pm

Hello everyone.
My wife (and I) got a 2003 Z4 2.5i. My understating is this engine should be the M54 B25. From my Z3 experience it seems this engine had a water pump that was catastrophically failing because of a plastic impeller. On the Z3 they were suggesting to replace it with a Stewart High Performance pump or the new BMW pump with metal impeller as a preemptive measure.
Does this suggestion apply to the Z4 as well?
Thanks

ovrkll · Post by **ovrkll** » Tue Apr 01, 2008 1:37 am

Have not heard of any water pump failures for the Z4. May want to check on Bimmerfest with some of the Gurus over there, though.

flyboyaj · Post by **flyboyaj** » Tue Apr 01, 2008 1:39 am

I never had any problems with my water pump on my old 2003 2.5i.

ZetaTre · Post by **ZetaTre** » Tue Apr 01, 2008 3:29 am

Great, one is checked off the list!!!!!!!!!!
Where can I find a list of the most common issues that Z4s tend to have? As a (VERY HAPPY) Z3 owner I'm used to deal with "minor" German engineers flaws... eheheh!!!
Thanks

ovrkll · Post by **ovrkll** » Tue Apr 01, 2008 11:25 am

Steering "sticking" on hot days and the new crop of rear springs breaking seem to be the only reoccuring problems I have seen, across multiple cars.

alindsay · Post by **alindsay** » Wed Apr 02, 2008 8:28 pm

The water pump failed on my '07 3.0si (N52 w/electric water pump) at about 4500 miles. Story was that the computer saw that the pump was drawing too much current so it shut it off!

Post by **srhutch** » Wed Apr 02, 2008 10:09 pm

We have electric water pumps, learn something new everyday, always thought they were mechanical of the main drive belt/chain

ZetaTre · Post by **ZetaTre** » Wed Apr 02, 2008 10:13 pm

I think is just the new engines (ie the N52). M54 (such as yours) have belt driven water pump.

BlackSapphireZ · Post by **BlackSapphireZ** » Mon Apr 07, 2008 2:14 am

yea your're gonna need it soon. they are plastic impellers as used in E46's they are prone to failure. mine on the other hand has been good @ 79000miles.

im going to buy waterpump, belts, and thermostat to do a over all cooling system maintenance.

ZetaTre · Post by **ZetaTre** » Mon Apr 07, 2008 6:14 pm

Ok, thanks. Does anyoine knows when BMW start installing the metallic impeller as OE?
I would suggest you use a Stweart water pump if you replace it: it's more expensive but is worth its price

Post by **srhutch** » Mon Apr 07, 2008 8:45 pm

ZetaTre wrote:I think is just the new engines (ie the N52). M54 (such as yours) have belt driven water pump.

But I have a N52

ZetaTre · Post by **ZetaTre** » Mon Apr 07, 2008 9:01 pm

Sorry, didn't see you were from outside the US...

Post by **srhutch** » Mon Apr 07, 2008 9:04 pm

ZetaTre wrote:Sorry, didn't see you were from outside the US...

not a problem

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