Mercury F4AZ-6049-A Cylinder Head Assembly

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To embark on an engine overhaul, the first step is to prepare the cylinder heads and valve train parts by cleaning and inspecting them. Take off any old gasket material and sealing compound from the surfaces. Use a solvent, dry it, and clean all parts thoroughly. The crack inspection process of the cylinder head starts with a visual check for cracks or other signs of damage. Check for warpage with a straight edge. Examine the valve seats as well as measure valve stem-to-guide clearance. Inspect valves for wear and imperfections. Check valve margin width. Look at the valve springs for wear and take free lengths measurements. Confirm retainers' condition along with their keepers'. Inspect rocker arm components for wear. Assess pushrods as well as rocker arm studs for damage. Replace any parts that have either worn out or are damaged in any way in this section.

The disassembly of cylinder heads involves removing the intake and exhaust valves and related components. Additionally, the rocker arm nuts, pivot balls, and rocker arms should be removed from the cylinder head studs.

The power steering pump needs to be unbolted and tied aside. The air conditioning compressor and bracket(s) need to be removed and positioned out of the way.

Position the new gasket(s) over the alignment dowels in the block.

Moly-base grease.

Keep all the parts for each valve together so they can be reinstalled in the same locations.

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.

Remove the exhaust manifold(s).

Remove the intake manifold (Section 11).

Reinstall the valve lifters.

On models with the type of seal shown, use a hammer and a seal installer (or a deep socket) to drive the seal onto the valve guide/head casting boss. Umbrella-type seals don't need to be driven into place.

Unbolt the power steering pump and tie it aside in an upright position. Leave the hoses connected.

Identify the left and right cylinder head gaskets as they are different and cannot be interchanged. Position the new gaskets over the alignment dowels in the block.

New and rebuilt cylinder heads are commonly available for most engines at dealerships and auto parts stores.

Check the spring retainers (or rotators) and keepers for obvious wear and cracks. Any questionable parts should be replaced with new ones, as extensive damage will occur if they fail during engine operation. Make sure the rotators operate smoothly with no binding or excessive play.