Mercury F4TZ-6505-AB Valve - Exhaust

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The home mechanic can remove and disassemble the head, do the initial cleaning and inspection, then reassemble and deliver the head to a dealer service department or an automotive machine shop for the actual valve servicing.

Install the remaining engine components and run the engine. It may be necessary for the engine to run several minutes for the clearance in the valve train to be taken up completely by the hydraulic lifter(s), particularly if new lifters were installed.

The head should be cleaned again to remove any remaining metal particles and abrasive grit from the valve service or head resurfacing operations. Compressed air can be used to blow out all the oil holes and passages.

Use the special service tool to compress the lifter to recheck the valve clearance.

After the valve job has been performed by a professional and the head is returned, it should be cleaned again before installation on the engine to remove any metal particles and abrasive grit that may still be present from the valve service or head resurfacing operations. Compressed air, if available, should be used to blow out all the oil holes and passages.

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.