Mercury 7L2Z-6049-C Cylinder Head Assembly

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Disconnect the radio capacitor from the side of the ignition coil pack and remove the ignition coil assembly.

New cylinder head bolts must be used for reassembly. Failure to use new bolts may result in cylinder head gasket leakage and engine damage. 15. The mating surfaces of the cylinder heads and engine block must be perfectly clean when the cylinder heads are installed. Use a gasket scraper to remove all traces of carbon and old gasket material, then clean the mating surfaces with lacquer thinner or acetone. If there's oil on the mating surfaces when the cylinder heads are installed, the gaskets may not seal correctly and leaks may develop. Cover the open areas of the engine with shop rags to keep debris out during repair and reassembly. Use a vacuum cleaner to remove any debris that falls into the cylinders. Do not use abrasive wheels or sharp metal scrapers on the heads or block surface; use a plastic scraper and chemical gasket remover, or the head gasket surfaces could develop leaks. 16. Check the engine block and cylinder head mating surfaces for nicks, deep scratches, and other damage. 17. Use a tap of the correct size to chase the threads in the cylinder head bolt holes. Dirt, corrosion, sealant, and damaged threads will affect torque readings. 18. Make sure the new gaskets are installed on the correct cylinder banks (Identify the left and right cylinder head gaskets; the shapes are different and cannot be interchanged). 19. Position the new gasket(s) over the alignment dowels in the engine block. 20. Carefully position the cylinder heads on the engine block without disturbing the gaskets. Install the NEW cylinder head bolts (the cylinder head bolts are torque-to-yield design and they cannot be reused). Following the recommended sequence, tighten the cylinder head bolts in five steps, to the torque and angle of rotation. Note: The method used for the cylinder head bolt tightening procedure is referred to as "torque-angle" or "torque-to-yield" method. Follow the procedure exactly. Tighten the bolts in the first step using a torque wrench, then use a breaker bar and a special torque-angle gauge to tighten the bolts the required angle. If the adapter is not available, mark each bolt with a paint stripe to aid in the torque angle process. 21. The remaining installation steps are the reverse of removal. 22. Install the engine. 23. Change the engine oil and filter and refill the cooling system, then start the engine and check carefully for oil and coolant leaks.

First hand tighten all bolts, then tighten them in five stages while following the proper sequence, using the angle gauge for the third and fourth tightening stages.

The engine must be completely cool when the heads are removed. Failure to allow the engine to cool off could result in head warpage.

If the inspection indicates that the valve components are in generally poor condition and worn beyond specified limits, the valves should be reassembled in the cylinder head, and valve servicing recommendations should be referred to.

Remove the cylinder head bolts and discard all but one. Compare the one old bolt with the new bolts to confirm they are correct.

Turn the camshaft until the pin is in the five o'clock position to avoid damage to the valves. Check the camshaft lobes to verify proper position.

Position the new gasket over the dowel pins in the block. Do not use a gasket sealer.

Refill the cooling system.

Apply silicone sealant to the mating surfaces, then install the intake manifold gasket and apply silicone sealant to the gasket at the same locations.

Install the heads and new head bolts. Tighten the bolts to the torque.

1. Lubricate and install each valve. 2. Install new seals on each of the valve stems, ensuring not to twist or cock the seals during installation.

Remove the valve cover(s).

40. Install the rocker arms and hydraulic valve lash adjusters. 41. The remaining installation steps are the reverse of removal. 42. Change the engine oil and filter, then start the engine and check carefully for oil and coolant leaks.

It may be more practical and economical for the home mechanic to purchase replacement heads because some specialized tools are necessary for the disassembly and inspection procedures, and replacement parts may not be readily available.

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