Take a look at this parts blow-up sketch regarding "Rack Dampener Pin"...
InterNet parts sources know it as:
"Injection Pump Rack Dampener Pin" and one sells it for only $37.00... but I've heard that there has been an official MB upgrade to this essential part so IF you end up needing to buy one, you might want to bight the bullet and purchase it from your local MBZ Dealer's counter... and ask if there has been an upgrade to the part.
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