This setup uses a hydraulic pump that is connected to the front of the engine. I you heard it there is a problem. I have never heard one operate. You may want to check your oil and see if it went in there. The seal can blow out and go into the engine's oil supply.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM