Mercury YF1Z-6505-BA Valve - Exhaust

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You will need to purchase these special parts from your local dealership.

1. Set the engine to TDC. 2. Remove the valve cover. 3. Remove the engine front cover. 4. Remove the timing chain and camshaft sprockets. 5. Remove both camshafts. 6. Remove a single tappet with a valve lapping tool or a magnet. 7. Note the thickness of the tappet face which is engraved underneath. If the marking is missing or illegible, use a micrometer to establish its thickness. 8. Use liberal amounts of oil on the replacement tappets when installing them. 9. After all replacement tappets are installed, reassembly may begin.

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.

A home mechanic can remove and disassemble the heads, perform the initial cleaning and inspection, and then reassemble the heads to deliver them to a dealer service department or an automotive machine shop for the actual service work. This inspection allows the mechanic to assess the condition of the head and valve train components and determine what work and new parts are required.