Mercury F6AZ-6049-AA Cylinder Head Assembly

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Examine pushrod ends for scuffing and bending, check rocker arm studs for damaged threads, and clean cam followers (for OHC engines), inspecting their pads and rollers, and replacing worn or damaged components.

The mating surfaces should be cleaned and checked for damage. The threads in the head bolt holes should be chased. The new gasket(s) should be positioned over the locating dowels. The head(s) should be carefully positioned on the block and the threads on all bolts should be lightly oiled. The recommended tightening sequence should be followed in two or three steps.

The disassembly of cylinder heads involves removing the intake and exhaust valves and related components. Additionally, the rocker arm nuts, pivot balls, and rocker arms should be removed from the cylinder head studs.

The valves and related components will already be in place.

Loosen the head bolts 1/4 turn at a time using a breaker bar and deep socket, following the reverse of the tightening sequence until they can be removed by hand. Discard the head bolts as they cannot be reused.

Scrape off any heavy deposits that may have formed on the valves, then use a motorized wire brush to remove deposits from the valve heads and stems. Again, make sure the valves don't get mixed up.

Ensuring the mating surfaces of the cylinder heads and block are perfectly clean is the first step.

Repeat the procedure for the remaining valves, ensuring that the components are returned to their original locations and not mixed up.

A valve spring compressor is used to compress the springs on the first valve.

Remove the exhaust manifold(s).

The mating surfaces must be perfectly clean. Use a gasket scraper to remove all traces of carbon and old gasket material, then clean the surfaces with lacquer thinner or acetone.

Change the engine oil and filter, then start the engine and check carefully for oil and coolant leaks.

Keep all the parts for each valve together so they can be reinstalled in the same locations.

Repeat the procedure for the remaining valves, ensuring that the components are returned to their original locations and not mixed up.

Check the cam follower pads (the areas that contact the lifter and valve stems end) for pits, wear, galling, score marks, and rough spots.

Lightly oil the threads of the new cylinder head bolts.

Apply a small dab of grease to each keeper to hold it in place. Compress the springs with a valve spring compressor and carefully install the keepers in the upper groove, then slowly release the compressor and ensure the keepers seat properly.

Use a pry bar at the corners of the cylinder head-to-engine block mating surface, but do not pry in the gasket sealing area.

Push the valve back into the head and deburr the area around the keeper groove with a fine file or whetstone.

Yes, decarbonizing chemicals are available and may be useful when cleaning cylinder heads and valve train components, but they are caustic and should be used with caution.