Mercury F6AZ-6507-AB Inlet Valve

The dealer service department or automotive machine shop will. Remove the valves and springs Recondition or replace the valves and valve seats Recondition the valve guides Check and replace the valve springs, spring retainers or rotators, and keepers (as necessary) Replace the valve seals with new ones Reassemble the valve components Ensure the installed spring height is correct Resurface the cylinder head gasket surface if it's warped.

Because of the complex nature of the job and the special tools and equipment needed, servicing of the valves, the valve seats, and the valve guides, commonly known as a valve job, should be done by a professional.