Mercury 7U7Z-6049-B Cylinder Head Assembly

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Store the cylinder heads on wood blocks to prevent damage to the gasket sealing surfaces.

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

Caution 1: These engines are difficult to work on and require special tools for many procedures. For any procedure involving timing chains, camshafts, or cylinder head removal, the steps must be read carefully, and disassembly must proceed using the special tools; otherwise, damage to the engine could result. Caution 2: The engine must be completely cool when the cylinder heads are removed. Failure to allow the engine to cool off could result in cylinder head warpage. Caution 3: The manufacturer states that the cylinder head cannot be machined in the event of warping. If the cylinder head warpage exceeds 0.001 inch (0.0254 mm), it must be replaced.

Position the new gaskets over the dowel pins on the block. Don't use sealant on the gaskets. Be sure the FRONT TOP marks are positioned correctly.

Unbolt and remove the cylinder heads, prying them up at a point where the gasket surfaces won't be damaged.

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.

Remove the cylinder head gasket and set it aside. Compare the old gasket with the new one to confirm that it is correct.

Check the rocker arm faces (the areas that contact the pushrod ends and valve stems) for pits, wear, galling, score marks, and rough spots.

Yes, it is recommended to remove the engine from the vehicle and place it on an engine stand, as this is a difficult procedure. However, 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.

Go to Step 7.

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

Carefully position the head on the block without disturbing the gasket.

Valve components such as retainers and keepers should be checked for wear and cracks. Any questionable parts should be replaced to prevent extensive damage during engine operation.

Thoroughly remove all traces of gasket material with a gasket scraper and clean all parts with solvent. Use a rag and acetone or lacquer thinner to remove any traces of oil from the gasket mating surfaces.

Cover the lifter valley with shop rags and use a vacuum cleaner to remove any debris that falls into the cylinders.

Remove the hydraulic chain tensioner.

Apply a small dab of grease to each valve stem lock.

Pull the valve out of the head, then remove the oil seal from the guide.

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

Loosen the rocker arms and remove pushrods.

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