M030
M030 Dork
3/21/15 5:49 p.m.

I have a 97 Boxster, which I love and to which I’ve done an LN Engineering intermediate shaft (IMS) bearing upgrade, the rear main seal (RMS) update and replaced the air-oil separator. I enjoy driving it, but after reading “Tech Forum: M96 Water Pumps” in Excellence #202, I’ve grown paranoid of the original plastic-impeller water pump failing and ruining my great running and over-maintained engine. Apparently, pieces of the plastic impeller break off, then circulate and jam cooling passages, creating a localized hot spot and cracking the block. This apparently happens silently and without warning. The lead tech at my local Porsche dealership told me that since my car’s water pump is not leaking or making noise or leaking, to just leave well enough alone. Despite this, I’m going to upgrade the pump, which brings me to my question: if factory Porsche replacement water pumps still have plastic impellers, would it not be wiser to install an aftermarket water pump with a metal impeller, such as the one made by GEBA?

oldtin
oldtin UberDork
3/21/15 8:02 p.m.

Common upgrade in BMW world, when you do the cooling system maintenance put in one with a metal impeller. I'd consider it preventive maintenance.

bgkast
bgkast GRM+ Memberand UltraDork
3/21/15 10:50 p.m.

I would do it.

WilberM3
WilberM3 Dork
3/21/15 11:31 p.m.

All the pumps we replace have a metal impeller. pretty sure they're Geba too.

Mr_Clutch42
Mr_Clutch42 Dork
3/22/15 4:54 a.m.

I have a 328i and I have a water pump with the metal impellers. I would suggest getting one, because you don't want to crack the block because you wanted to wait for the pump to go bad. I understand that Porsche engines are expensive, too.

M030
M030 Dork
3/22/15 5:40 p.m.

THANK YOU!!

sesto elemento
sesto elemento Dork
3/23/15 10:35 p.m.

Here is your solution buddy

It's from a lotus elise

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