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  #1  
Old 09-24-2017, 01:14 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
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Clean coolant, rusty pump impeller

A few weeks ago I changed the wagon thermostat and flushed out the green coolant from the PO's tenure. I noticed some play in the water pump pulley and slow coolant loss so I replaced the water pump yesterday. The green coolant was clean and the weeks old G-05 was also clean. The revealed block and pump coolant passages were immaculate. The pump impeller however was rusty. The old pump has OE/dealer replcement markings. What should I make of this rust?

Sixto
98 E320s sedan and wagon

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  #2  
Old 09-24-2017, 02:06 PM
Mike Murrell's Avatar
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The previous owner changed the coolant just before he sold the car. The stuff he drained out was likely full of corrosion; hence the condition you found the impeller in.

The impeller may have been made from a material more prone to rusting than the MBs block and coolant passages.

Just a WAG.
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Old 09-24-2017, 02:27 PM
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What kind of material is the impeller made of? Cast iron? Steel? As said above, the coolant may have been neglected previously in the car's life and if so, the rust wouldn't be unusual. Iron would be more prone to rust than steel, especially if the coolant was old and lost its anti-corrosion properties at some point in the past.
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Old 09-24-2017, 02:31 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Thanks, Mike. That's probably the right track but I have to give credit to the PO. This fellow was open about all the problems with the car and sold it as a non-runner (though I drove it 30 miles home). He did nothing to pretty it up to sell. He just wanted it gone. So maybe it was neglected and at some point then serviced to where the cooling system was cleaned but the impeller didn't recover.

I don't know iron from steel. I know it's ferrous

Sixto
98 E320s sedan and wagon

Last edited by sixto; 09-24-2017 at 02:48 PM.
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  #5  
Old 09-24-2017, 02:53 PM
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Usually an iron impeller will be cast (you'll see the rough areas from the sand mold). Steel will usually be stamped, think of a sheet shaped like a saw-blade then pressed so that the "teeth" stand up as the impeller vanes.

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