It depends on whether or not the valve came in contact with the piston and caused damage. If this happened, it could take 10 to 15 hours of labor or more. If not, usually about 3 hours.

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