Mercury 3L3Z-6564-BA Arm Assembly - Valve Rocker

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There are two techniques of dismantling the rocker arms and lash adjusters of this engine however the manufacturer prefers the technique that allows removal of the rocker arms and lash adjusters together without having to remove the camshaft(s) and this they can be done by using the special valve spring compressor meant for the engine. This proceeds from the camshaft, and accompanied with a ratchet or a breaker bar, it depresses the valve spring so that tension on the rocker arm is removed. The other method of its measurement entails the withdrawal of the camshaft for measurements to be made on it. First, remove the valve cover(s) and place the valve spring compressor tool in position and compress the spring only to take the rocker arm loose. Before proceeding the camshaft rocker arms and hydraulic lash adjusters have to be refitted in the positions they were removed from, so do not forget to label all the parts before storing them. Subsequently, disconnect the hydraulic lash adjuster and make sure you set aside things that will need to be reassemble. If the vehicle has very high trip settings, the adjusters might be built to last longer and rather stubborn to come out; use of penetrating oil will be helpful. Visual check each adjuster for wear and possible damage, such as pitting or discoloration, and consider to replace it in case doubts concerning it or in case of existence of the noise in the valve train are presupposed. An ordinary hair-pin or a twig of a paperclip can be used to touch the plunger to feel whether it has a restricted movement of not more than 1.5mm. Recommended for adjustment when one of the carriers requires replacement, it is better to replace the entire set and then avoid using more cash for repair. Also be sure also to check the conditions of the rocker arms by applying pressure to them to see signs of wear or damage. Prior to the installation of the lash adjusters, purge them of air as follows: stand the lash adjusters vertically in the oil and with the help of a thin wire or paper clip work the plunger. Coat the tip of stem, the rocker arm, the lash adjuster bore with clean engine oil; place the lash adjusters and the rocker arms with the aid of compressed valve spring. This is a process of removal and hence the steps followed here are the reverse of the steps that were highlighted during installation process. Modified lash adjusters will make some noise when starting until the air is cleared off; to reduce the noise on start up, change the engine speed from idle position to 3,000 rpm for one minute after the engine is warm.

These engines are difficult to work on and require special tools for many procedures. On any procedure involving timing chain, camshaft, 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. Begin by removing the valve cover(s). Due to the interference design of these engines, the rocker arms must be removed before the timing chains and camshafts. Position the pistons off TDC before compressing the valve springs to remove the rocker arms or lash adjusters, compressing one cylinder at a time. Use a valve spring compressor to compress the spring enough to remove the rocker arm, ensuring that rocker arms and lash adjusters are matched to their original locations. Insert a valve spring spacer before compressing to prevent damage to the valve seal. Remove the hydraulic lash adjuster, applying penetrating oil if necessary. For 3-valve 4.6L and 5.4L engines, follow a two-stage process to remove rocker arms, ensuring to rotate the engine appropriately and label all components for reassembly. For the 5.0L engine, remove the camshaft operating the roller followers and separate the hydraulic lash adjusters from their clips. In 6.2L engines, remove the lower eight spark plugs, rotate the crankshaft to open the intake and exhaust valves on designated cylinders, and remove the rocker shaft assemblies. Inspect each adjuster for wear or damage, ensuring the plunger is not stuck, and consider replacing the entire set if any adjusters are replaced. Inspect the rocker arms for wear, particularly at contact points. When installing, bleed air from the lash adjusters, lubricate necessary components, and install them with the valve spring depressed. For 6.2L engines, clean and lubricate rocker arms and shafts before installation, positioning the camshaft lobes correctly for each cylinder during the process. The remainder of installation follows the reverse order of removal.

Remove the timing chains and the camshafts from the cylinder heads to access the hydraulic lash adjusters.

It is recommended to replace the entire set of lash adjusters to avoid repeating the repair procedure in the future.

Set the rocker arms and guides in place, then install the fulcrums and bolts. Tighten the rocker arm bolts to specifications.

Before installation, bleed as much air as possible from the lash adjusters by standing them upright in a container of oil and working the plunger up and down with a thin wire or paper clip.

Lubricate the lower end of each pushrod with clean engine oil or moly-base grease and install them in their original locations, ensuring each pushrod seats completely in the lifter.

Apply moly-base grease to the ends of the valve stems and the upper ends of the pushrods before positioning the rocker arms and fulcrums. Also, apply moly-base grease to the fulcrums to prevent damage to the mating surfaces before engine oil pressure builds up.

Yes, it is the new manufacturing part number

The rocker arms are sold individually, one per order

On a 5.4L engine you will need 24