Did this same repair about two years ago and documented in a thread here.
The "big" advice I would offer is to loosen the magnetic clutch while the pump is still on the car, rather than waiting until after it is off.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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