Mercury 7U7Z-6049-AALH Cylinder Head Assembly

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Yes, it is recommended that the engine be removed from the vehicle and placed on an engine stand, as this is a difficult procedure. It is possible to remove the cylinder heads in-vehicle, but it requires all necessary special tools and an expert skill level in automotive repairs.

Disconnect the negative cable from the battery.

Drain the cooling system, including removing the engine block drain plugs.

In Chapter 2, Part D.

Due to limited working space, the following procedure is written using the manufacturer's recommended method, with the engine removed from the vehicle.

Inspect the pushrod ends for scuffing and excessive wear. Roll each pushrod on a flat surface to determine if it's bent.

Each valve spring should be checked for wear and pits, and its free length should be measured and compared to specifications. Springs that are shorter than specified should not be reused.

Smear a little grease in the gap. After cleaning each piston, use a small brush to remove all traces of grease and carbon from the gap, then wipe away the remainder with a clean rag.

Carefully position the cylinder heads on the engine block without disturbing the gaskets, install new cylinder head bolts, and follow the recommended tightening sequence.

Remove the cylinder head gasket and set it aside, comparing it with the new one to confirm correctness.

Remove the exhaust manifold mounting bolts. The manifold itself can remain in place.

Remove the air cleaner outlet tube and air cleaner assembly.

Do not, under any circumstances, shim the springs to the point where the installed height is less than specified.

Use a tap of the correct size to chase the threads in the head bolt holes and recheck all head bolt holes and cylinder bores for any traces of coolant, oil, or other foreign matter, removing as needed.

Remove the radiator fan/clutch assembly, water pump pulley, and timing belt front cover.

If the head was sent out for valve servicing, the valves and related components will already be in place.

21. Repeat Steps 17 through 20 for the right-hand cylinder head. 22. Remove the cylinder head bolts, following the reverse of the tightening sequence. 23. Use a pry bar at the corners of the head-to-block mating surface to break the gasket seal. 24. Lift the cylinder head(s) off the engine. 25. Remove the old cylinder head gasket(s). 26. Cylinder head disassembly and inspection procedures are covered in detail in Chapter 2, Part F.

Begin the reassembly procedure with Step 9.

Remove the rocker arm nuts, pivot balls, and rocker arms from the cylinder head studs, and label the parts or store them separately. A small plastic bag with an appropriate label can be used to store the valve train components so they can be kept together and reinstalled in their original position.

Remove the chain tensioning tool and install the hydraulic tensioner.

Stand each spring on a flat surface and check it for out-of-square. If any of the springs are distorted or sagged, replace all of them with new parts.

Remove the rocker arm nuts, pivot balls, and rocker arms from the cylinder head studs, and label the parts or store them separately. A small plastic bag with an appropriate label can be used to store the valve train components so they can be kept together and reinstalled in their original position.

Begin the reassembly procedure with Step 9.

Remove the tensioning tool and install the hydraulic tensioner.

Inspect the head very carefully for cracks, evidence of coolant leakage, and other damage. If cracks are found, check with an automotive machine shop concerning repair. If repair isn't possible, a new cylinder head should be obtained.

Remove the bolt holding the transmission dipstick tube.

Use a tap of the correct size to chase the threads in the cylinder head bolt holes.

Use a tap of the correct size to chase the threads in the cylinder head bolt holes.