Mercury AL8Z-6049-B Cylinder Head Assembly

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Install the rest of the parts in the reverse order of removal, tightening fasteners to the specified torque values. Fill the engine with fresh engine oil and the cooling system. Reconnect the battery, and note that the Powertrain Control Module (PCM) must relearn its idle and fuel trim strategy for optimal performance. Finally, start the engine and check for leaks.

Start the engine and check for leaks.

Remove and discard the gasket. Check for the presence of locating dowels in the cylinder block and cylinder head.

Loosen the ten cylinder head bolts progressively and by half a turn at a time, working in the reverse order of the tightening sequence.

1. Ensure the mating surfaces of the cylinder head and block are perfectly clean. 2. Check the mating surfaces for nicks, deep scratches, and other damage. 3. Use a straightedge to check for warpage of the cylinder head gasket surface. 4. Clean the mating surfaces with a clean shop towel and solvent as needed. 5. Ensure the two locating dowels are in position in the cylinder block and that all cylinder head bolt holes are free of contamination. 6. Install new cylinder head gaskets on the block, over the locating dowels. 7. Carefully install the cylinder heads, ensuring they fit properly over the locating dowels. 8. Install new cylinder head bolts and turn down by hand until snug.

No subsequent tightening is necessary.