I know the dealer here swaps out the internals of the pumps and that seems to work quite well. Also, you'll need to replace the hose to the reservoir.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
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Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta