Ford YL2Z-6564-AA Arm Assembly - Valve Rocker

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Before removing the valve cover(s), loosen the Rocker arm shaft support bolts, in a turn of turn basis beginning with the middle bolt in order not to stripped the head by the pull of valve spring when loosening the bolt by hand. Remove the rocker arm shaft assembly from the cylinder head and, then, visually differentiate each shaft assembly so that it could be fitted back into the same place. Then, take out the push rods and put them on a holder making sure you have arranged them in a manner that will allow for easy reinstallation. Remove the pins from the rocker arm assembly and lay the pieces on the workbench that they will not be mixed up. Check each rocker arm to see that it is not worn, cracked, or damaged especially at the ends where it bears on the push rods and valve stems: oil passages should be open. Measure the wear on the rocker arm bore combined with the rocker shaft worn position and replace the defective part. The push rods should be examined for cracks and signs of wear; the entire length of these should be rolled between two flat surfaces in order to identify bending. If this is so, the plugs which can be seen, protruding from the ends of the rocker shafts have to be removed and new ones inserted after the old ones have been knocked out. Rocker assembly can now be assembled and areas that have friction with engine assembly lube and new cotter pins are fastened at the ends of the rocker shaft with the oil hole facing downwards. Before final installation of the push rods, be sure to apply engine assembly lube on both ends of the rods, if the rods are original ones, you must place them back to their original positions. Grease the rocker arm pads and replace the rocker arm along with its positions on the notches on the shafts and the ball ends in the push rods . Torque the rocker shaft support bolts in a turning sequence from the center bolt to the outside in a two turn increments to the required torque and in the same manner that was followed to remove them.

The lash adjuster must have no more than 1.5 mm of total plunger travel.

If the rocker arm shaft plugs were removed, tap in new ones with a hammer and suitable drift.

A special valve spring compressor made specifically for the SOHC engine.

A thin wire or paper clip can be placed in the oil hole to move the plunger and ensure it is not stuck. The lash adjuster should have no more than 1/16-inch of total plunger travel.

Install the pushrods.

Lift the pushrods out of the engine and place them in order in a labeled holder so they can be returned to their original positions. Ensure they are stored with the same end facing up.

Lubricate the lower end of each push rod with clean engine oil or moly-based engine assembly lubricant and install them in their original locations. Make sure each push rod seats completely in the lifter.

The remainder of the installation is the reverse of the removal procedure.

Remove the hydraulic lash adjuster and store it along with the rocker arm in an organized manner to ensure they are returned to their original locations. If the vehicle has many miles, apply penetrating oil around the lash adjuster to help loosen any varnish.

Check the rocker arm fulcrum contact area for wear and galling. If the rocker arms are worn or damaged, replace them with new ones and use new fulcrum seats as well.

Bleed the lash adjusters of air by standing them upright in a container of oil and using a thin wire or paper clip to work the plunger up and down. Leave the adjusters in the oil until ready to install.

Install new cotter pins in the ends of the rocker shaft. Be sure the rocker shaft oil holes will face down when the shaft is installed. The position of the oil holes is indicated by a notch on the front of each shaft.

Beginning at the front of one cylinder head, remove the rocker arm fulcrum bolts. Store them separately in marked containers to ensure that they will be reinstalled in their original locations.