Lincoln 1L2Z-6049-LA Head Assembly - Cylinder

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Dealerships and auto parts shops sell new and rebuilt cylinder heads. One would require some specialized tools for dissembling and inspecting it. Buying replacement heads may be more feasible than trying to find replacement parts. When disassembling the cylinder head, remove valves and rocker arm components then label or store them separately. Use a spring compressor in removing the keepers and other parts.

Remove the drivebelt and the drivebelt tensioner.

NEW head bolts should be used to secure the cylinder heads.

The exhaust manifold(s) for both cylinder heads need to be removed.

Carefully position the head(s) on the block without disturbing the gasket(s).

Loosen the nut and slide the positive battery cable bracket up and off the stud on the right side of the cylinder head, then set the cable out of the way for cylinder head removal.

Clean scale buildup from coolant passages using a stiff wire brush and clear deposits from various holes. Tap the threaded holes to remove corrosion and sealant, and use compressed air to clear debris.

Remove the rocker arm nuts, pivot balls, and rocker arms from the cylinder head studs, and label the parts or store them separately to ensure they can be reinstalled in their original locations.

Apply a small dab of grease to each keeper to hold it in place.

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

Shims can be added under the springs to correct it.

Rotate the crankshaft counterclockwise so the keyway is in the 9 o'clock position to avoid damage to pistons or valve train parts.

Any damaged or excessively worn parts must be replaced with new ones.

Proceed to Step 12.

Lubricate and install the valves, then install new seals on each of the valve guides. Using a hammer and deep socket, gently tap each seal into place until it's seated on the guide.

Loosen the cylinder head bolts in 1/4-turn increments until they can be removed by hand, working in a reverse pattern of the tightening sequence.

Don't, under any circumstances, shim the springs to the point where the installed height is less than specified.

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

Run an appropriate-size tap into each of the threaded holes to remove corrosion and thread sealant. If compressed air is available, use it to clear the holes of debris.

Because specialized tools are necessary for disassembly and inspection, and replacement parts may not be readily available, it may be more economical to buy replacement heads.

Damage may result to either the pistons or valve train parts.

Remove the bracket from the cylinder head and position the assembly out of the way without disconnecting the hoses. Disconnect any electrical connectors from the cylinder head and mark them with tape for correct reassembly.

The engine must be completely cool when the cylinder heads are removed. Failing to allow the engine to cool could lead to cylinder head warpage.