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  #1  
Old 01-17-2002, 10:25 AM
brookspw's Avatar
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Location: Nashville, TN
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I'm on my 5th Water pump!

Just bought (2 months ago) a 1991 190E 2.6 -- the car was very well maintained.

In going through the service records, I find that it is now on its 5th water pump. The car only has 123,000 miles!

What is up with that? Otherwise, no major problems of any sort.

brookspw
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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #2  
Old 01-17-2002, 10:40 AM
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Location: charlotte hall md.
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Has the same person replaced rthe pump each time.if so They could have tightened the belt way to much,putting stress on the pump.just one thought.
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  #3  
Old 01-17-2002, 10:43 AM
moedip
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Were they Mercedes OEM pumps or aftermarket?
Second - check that the belts on the water pump are not overtightened which could put undue pressure on the front pump bearing and cause premature failure. Adjust all belts to proper tension. That is only thing that I can think of.
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  #4  
Old 01-17-2002, 12:49 PM
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Check all pulley ALIGNMENTS as well.
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  #5  
Old 01-17-2002, 12:54 PM
brookspw's Avatar
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All were MB pumps. All but the 3rd one were replaced at the original dealership.

Next time in, I'll have them check the belts and pulleys.

Thanks -- brookspw
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
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  #6  
Old 01-17-2002, 02:15 PM
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Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
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That's LOTS! MY Dad's 90 190E 2.6 is close to 200,000 miles, and it's on it's original water-pump.

If they are MB pumps, it soulds like an install problem, or other related problem is causing the new pumps to fail.
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1998 C230 "Black Betty" 240K

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  #7  
Old 01-17-2002, 03:43 PM
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Join Date: Oct 2001
Location: Newton, MS
Posts: 123
One thing (among many) to suspect is the viscofan operation. My manual states, "Temperature-controlled viscous fan couplings must be transported upright. Fot brief periods e.g. for installation purposes, the couping may be placed on the flange side, but never on the front side".

It also states, "The bimetal strip must not be bent or damaged".

I take this to mean they may no longer function properly.

My question would be, if one of the above occured during the first pump replacement, could that lead to a mistaken belief that the pump failed?

Just a thought.

Harry
86 300 SDL
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  #8  
Old 01-17-2002, 06:54 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
MB replacement pumps are REMAN's & they do fail often!
I have had better luck with aftermarket "new" pumps. ie; Graf
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