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  #1  
Old 01-09-2002, 01:26 PM
ryalljw
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Question 95 E320 Water Pump Relpacement

I have a leaking water pump (95,700 miles), and have removed the pump while awaiting the replacement pump. Without the replacement pump in hand I'm curious as to whether or not there is a gasket that is mated between the block and the pump? Or is there only what appears to be a rubber o-ring on the mating face of the pump. Is there a gasket on the engine block also?

Any other "do it while your in there" aside from the T-stat replacement?

Thanks,

John Ryall
95' E320
88' 928S4
96' Ford Contour
86' Jeep Grand Wagoneer
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  #2  
Old 01-09-2002, 02:04 PM
engatwork's Avatar
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Location: Soperton, Ga. USA
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If memory serves me - the o-ring on the pump is the only thing. I replaced the radiator with a new Behr unit the same time I replaced the pump.
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Old 01-09-2002, 02:15 PM
ryalljw
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Thanks Jim.

Any reason for replacing the radiator?

John
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  #4  
Old 01-09-2002, 07:42 PM
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I agree, change out the radiator, esp. if the coolant has not been changed every 2-3 years.

If you can wait, you can have a rebuilt radiator from Reseda Radiator that specializes in rebuilt radiators and will give you core-credit for about $125.

Also, change out ALL hoses (heating & cooling) and the thermostat like you mentioned if they haven't been changed out in 2-3 years.

BTW- I hope you're replacing the waterpump with an actual Mercedes (new or rebuilt) waterpump. Aftermarket ones are not built to the same tolerances, AND the impellar blades are not shaped like the factory ones for better water circulation.

:-) neil
1988 360TE AMG
1993 500E
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Old 01-09-2002, 08:40 PM
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It is a long story - let's just say that if the wife is driving and the radiator goes then I will be rebuilding an engine. Let's just say that a new radiator is cheap insurance.
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  #6  
Old 01-10-2002, 11:32 AM
ryalljw
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Neil,

The waterpump I installed is made by LASO. I called the Parts Shop (mercedesshop) and this is what Phil offered me when I asked for a replacement water pump.

It makes sense that aftermarket parts are often not manufactured to the MB tolerances nor quality level. I wasn't offered an original Mercedes water pump or a rebuild, so it never occured to me. I asked about rebuilds, which Phil didn't recommend. I've installed a rebuilt water pump in my 928 S4, but they are a bit simpler in construction than the MB's.

I'm a bit curious about the impeller blades being of a different shape, and how this leads you to state the water circulation will be worse as a result.

I replaced the return hose to the engine block, but not the other three hoses. While observations aren't the best methods to determine their condition, the others appeared to be in good shape, and I figured they would last until the next coolant change.

The coolant has been changed regularly on the car per the service records.

John
95' E320 (95,000 mi)
88' 928S4 (81,000 mi)
96' Ford Contour (139,000 mi)
86' Jeep Grand Wagoneer (126,000 mi)
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  #7  
Old 01-10-2002, 02:46 PM
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The was an article in "THE STAR" and it showed a picture of an aftermarket MB waterpump vs. a factory MB waterpump.

The factory pump had curved fins/fingers in the impellar to provide increased flow. The aftermarket did NOT.

Also, a rebuilt factory MB waterpump was only $89; came with a 12-month warranty; AND since purchased from the dealer, LABOR would be covered to replace the pump should it fail, and anything else that a failed pump could damage.

In short, sometimes it makes sense to go with factory MB parts such as: tranmissions, engines and computers. Almost anytime the LABOR and collateral damage could be very expensive.

:-) neil
1988 360TE AMG
1993 500E
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  #8  
Old 01-12-2002, 12:03 PM
ryalljw
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Neil,

Which water pump are you talking about, and for which car? $89 for a rebuilt waterpump on a V-8, or the inline 6? I'm asking because a rebuilt on my 928 S4 is only $99, but it is a much simpler casting than the water pumps on the inline 6 motor. The water pump for the 928 V-8 bolts to the front of the block, whereas the one for the E320 bolts to the side of the block. I don't think we're talking about the same water pump.

Put the aftermarket pump vs MB pump into a test-stand, and show me the two performance curves for circulating the coolant in the cars. Saying the impeller on the MB original is shaped differently does not automatically guarantee its performance is better. From a hydraulics standpoint, I'd like to know if there is a significant differnce. You can achieve the same flow and head from differently shaped impellers, albeit your efficiencies will likely be different.

Certainly MB wants their customers' business for components on their cars. That doesn't necessitate that they will outperform every aftermarket component that is sold, since a waterpump typically is a relatively simple component (casting, impeller, bearing, shaft, etc.)

John
John
95' E320 (95,000 mi)
88' 928S4 (81,000 mi)
96' Ford Contour (139,000 mi)
86' Jeep Grand Wagoneer (126,000 mi)
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  #9  
Old 01-13-2002, 05:00 AM
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Join Date: Apr 1999
Posts: 2,632
I don't remember if the pumps compared was for an Mercedes inline-6 or V8.

However, I only paid $89 from the dealer for a M103 waterpump about 2-years ago.

Search the Mercedes archive on the Ritter-Easley list and you will find the person who experienced the higher temps with the aftermarket waterpump. I believe it was only during IDLE that the flow wasn't sufficient.

Again, with the factory warranty and labor covered, I still think it's smart to get Factory parts on some items.

:-) neil
1988 360TE AMG
1993 500E
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