Mercury 9L3Z-6049-GB Cylinder Head Assembly

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Drain the cooling system.

Loosen the cylinder head bolts in 1/4-turn increments until they can be removed by hand, working from bolt-to-bolt in the reverse of the lightening sequence. Discard the bolts as new bolts must be used when installing the cylinder head(s).

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.

1. Unbolt the power steering reservoir and tie it aside in an upright position, leaving the hoses connected. 2. Remove the drivebelts. 3. Remove the air-conditioning compressor/power steering pump bracket from the head without disconnecting the hoses.

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

Most machine shops will not have a core set of heads unless the vehicle has been on the market for close to five years, meaning you may have to wait for the rebuilding work to be completed on your heads.

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

Thorough cleaning of the cylinder head(s) and related valve train components, followed by a detailed inspection, will enable you to decide how much valve service work must be done during the engine overhaul.

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

Regardless of whether or not the head was sent to an automotive repair shop for valve servicing, make sure it's clean before beginning reassembly.

The first step involves the removal of the intake and exhaust valves and related components, including the rocker arm nuts, pivot balls, and rocker arms from the cylinder head studs.

Check each valve spring for wear and pits, measure the free length, and ensure it meets specifications. Springs that are shorter than specified should not be reused.

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

Remove the air conditioning compressor and position it off to the side without disconnecting the refrigerant lines.

The method is referred to as "torque-angle" or "torque-to-yield." Follow the procedure exactly, using a torque wrench and a breaker bar with a special torque-angle gauge.