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Old 10-09-2003, 01:08 AM
RunningTooHot's Avatar
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Join Date: Aug 2000
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Posts: 775
Question Theoretical question regarding water pump wear…

Has anyone ever run across a situation where a water pump has ended up with reduced pumping capacity due to the vanes becoming worn down from erosion (not corrosion) at high mileage? My water pump is original with almost 325,000 miles – believe it or not!

I am starting to suspect that the pump may not be displacing as much water as it should, but I don’t want to pull the pump just to inspect it; if I can rule out this possibility, it could save me some potentially unnecessary work. (I was thinking about replacing the pump just as a matter of course, but it’s not leaking – and I’m thinking about the old adage “if it ain’t broke, don’t fix it”.)


Current rolling stock:
1992 500E 217,000+
1995 E300D 410,000+
1998 E300D 128,000 (New Toy!)

Non-rolling stock:
1992 400e / Bornite w/ 177,000 - needs harness

Prior MBZ’s:
1952 220 Cab A
1966 300SE
1971 280SE
1973 350SLC (euro)
1980 450SLC
1980 450SLC (#2)
1978 450SLC 5.0 (sold her - sniff, sniff)
1984 300D ~243,000 & fondly remembered
1993 500E - sorely missed.
1975 VW Scirocco w/ stroked, slightly de-tuned Super-Vee engine - Sold after 30+ years of ownership

Last edited by RunningTooHot; 10-09-2003 at 01:55 AM.
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Old 10-09-2003, 04:08 AM
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Join Date: Jun 2002
Location: Monrovia, CA
Posts: 490
At that high a mileage, I'd replace the water pump as a matter of course and chalk it up to preventive maintenance. Just one less thing to worry about on a long trip. I'm not sure if the rotor can erode enough to diminish output, but the only way you can rule it out for sure is to pull the pump and measure the clearances. At that point you might as well replace the pump. After 325K mi., I think you've gotten your money's worth out of it. If it ain't broke, and it's seen a lot of miles, replace it before you have to fix something more expensive!

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Old 10-09-2003, 09:46 AM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,743
I rather doubt ANY erosion can take place on a water pump vane unless there is abrasive debris in the cooling system. I'm surprised the seal has held up this long.

If you're suspecting poor cooling performance, a likely cause is mineral buildup in the radiator. I've heard there are boiling techniques and rodding techniques to rejuvenate a radiator.
95 E320 Cabriolet, 131K
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