Mercury F5AZ-6049-A Cylinder Head Assembly

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Remove the valve cover(s), pushrods, intake manifold, drive belts, idler pulley bracket, Thermactor valve and pump, and crossover tube first. For the left cylinder head, take out and unbolt the air conditioning compressor and bracket(s). Disconnect the fuel line from the right cylinder head and remove the exhaust manifold(s). Then draw on cardboard around each cylinder and bolt pattern using a new head gasket. Loosen the head bolts in 1/4 turn increments; store them; then lift off the heads. When installing, clean surfaces; check for damage; chase holes for bolts; position new gasket(s). Put heads in place on the block after oiling bolt threads and tighten them according to this sequence. Finally, perform the reverse order of the remaining steps plus change the engine oil & filter before starting the engine.

Follow the recommended sequence and tighten the bolts in three steps.

Lubricate and install the first valve.

Measure valve stem-to-guide clearance, scrutinize valves for wear, deformation, cracks, and margin width (which should be at least 1/32-inch).

Specialized tools are necessary for the disassembly and inspection procedures of cylinder heads.