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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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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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