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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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Old 11-21-2012, 11:12 AM
Maxxrox Maxxrox is offline
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Location: USA
Join Date: Oct 2009
Posts: 6
Mein Auto: 1996 BMW Z3/2001 GSX600F
Z3 Impeller Materials

Hey all,

Have 85K on the clock, so changed out my '98 2.8l Zed's water pump, serpentine tensioner & pulley, and both belts over lunch. Better safe than expensive. Even counting in fabbing up a fan-holder tool, it was a ton simpler than the last time I did all this (on a '96 Z3, heh).

At any rate, once I'd pulled the pump that was in there (which was not making noise; this is all simply preventative maintenance), I noticed that the impeller was metal. Anyone know if 1998 Z3s shipped with metal-impeller water pumps? I was under the impression they were all composite materials (hence the extra mess if/when the bearing gave). If I'm correct, that means the previous owner actually changed it out at some point.

Hilariously enough (if you have that sort've sense of humor), the bearings on my alternator started making noise on the way to work this very morning, so I get to pull a bunch of this stuff apart in a few days time!

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Old 11-25-2012, 01:13 PM
ronbo ronbo is offline
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Location: Cincinnati
Join Date: Sep 2006
Posts: 6
Mein Auto: 2002 M Roadster
My 97 Roadster was composite but my 2000 M Roady was metal. They seem to be mix and match because when I was trying to find out about my materials in my 2k M Roady I was told that it was composite but when i took it out it was metal. That was from the BMW dealership. I am glad I didn`t let them replace it.
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Old 11-27-2012, 04:59 AM
redhotz redhotz is offline
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Location: ohio
Join Date: Feb 2006
Posts: 36
Mein Auto: 98 z-3 2.8l
My 98' Z-3, 2.8l, had a metal impeller blade when I changed it.
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Old 12-02-2012, 09:00 AM
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morrieschoice morrieschoice is offline
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Location: birmingham,al
Join Date: Oct 2006
Posts: 529
Mein Auto: 2001 3.0 Z-3 ROADSTER

My 2001 had a metal impeller, but I replaced it with a Stewart pump...should last the life of the car...I hope
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Old 12-14-2012, 04:55 AM
mehig mehig is offline
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Location: Kentucky
Join Date: May 2012
Posts: 4
Mein Auto: 1998 Z3 M roadster
98 Z3 M roadster, May 16th production date, with metal impeller, replaced with Stewart Pump.
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Old 01-10-2014, 12:41 PM
Pima Roadster Pima Roadster is offline
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Location: Tucson Arizona
Join Date: Dec 2011
Posts: 170
Mein Auto: 2001 BMW Z3 3.0

Last edited by Pima Roadster; 01-10-2014 at 04:09 PM. Reason: wrong place!
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