Mercury F77Z-6507-AA Valve - Inlet

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Set the Number 1 cylinder to TDC on the compression stroke. The intake and exhaust cam lobes of the Number 1 cylinder will be pointing upwards (though not vertical), allowing the valve clearances to be checked.

After the valve job has been performed by a professional, the head will be in like-new condition. When the head is returned, be sure to clean it 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. Use compressed air, if available, to blow out all the oil holes and passages.

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.

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.