Chrysler 4663996 Exhaust Rocker Arm

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To avoide sucking in of air into the lash adjusters do not rotate the rocker arm assemblies upside down. In case they are placed on a bench, they should not rest on the lash adjusters in order to avoid the breakage of the plastic retainers and the lash adjusters. Begin by removing the valve cover(s) and marking the rocker arms and pedestals for identification, noting there are four per cylinder: There are two intakes and two exhausts. Remove each rocker arm shaft bolt about a quarter turn in the opposite direction that it was tightened when removing the rocker shaft and the rockers in one assembly. Check each rocker arm for signs of wear, cracks and damage, rotate the rollers, check that the surfaces of the lash adjuster are in good shape. The lash adjuster must not be pulled out of the rocker arms so that it does not get damaged. Look at the state of pivot area and the shaft and if it is seen that some parts are too worn out, then they should be replaced. Check the orientation of the axle for the roller tip and inspect the hydraulic lash adjuster-to-valve stem tip contact surface for signs of wear. For the removal of rocker arms and pedestals for inspection, the dowel pins can be removed by using a 4 mm screw, nut, washer and spacer; when reinstalling it is important to apply new dowel pins. Should rocker arms or pedestals have been removed for maintenance then the shafts should be lubricated and the rocker arms place in their proper direction; the intake rockers on the intake shaft and the exhausts on the exhaust shaft. Be certain that the notches facing up when assembling so as not to harm the rocker arm shafts. Install new dowel pins in the condition that they should penetrate deepest into each pedestal. Place the rocker arm assemblies with the valvetrain in a no-load condition with the camshaft and crankshaft sprockets aligned at TDC number 1; tighten the right side rocker arm assembly bolts in the proper sequence; install and tight the left rocker arm assembly bolts. Make sure top of the notches on the left rocker arm shafts is directed forward and upward while that of the right rocker arm shafts is also directed backward and upward. Last of all, reinstall every component in a backward order to which you removed; switch on the engine and examine for leakage of oil.

Remove the pushrods and store them in order to prevent mixing them up during installation.

The upper intake manifold and the valve cover(s) need to be removed.

Removing the liming chains and the camshafts, which requires major disassembly of the engine and surrounding components.

Keep the rocker arm assemblies in an upright position and avoid placing them on the lash adjusters when on the bench to prevent damage.

Installation is the reverse of removal, with the exception that the lash adjuster should always be installed first, ensuring they are at least partially full of oil, indicated by little or no lash adjuster plunger travel.

Install the rocker arm assemblies with the valvetrain in a no-load situation by aligning the camshaft and crankshaft sprockets for TDC number 1, then tighten the right side rocker arm assembly bolts in the proper sequence before installing and tightening the left rocker arm assembly bolts.

After removing the rocker arms, pull the lash adjusters out of the cylinder head and store them with the corresponding rocker arm.

On the cylinder head.

Ensure to install the correct length pushrods to compensate for the reduced distances of the rocker arms to camshaft dimensions.

When installing the rocker arms and pedestals in their previously marked order, keep the intake rockers on the intake shaft and exhaust rockers on the exhaust shaft, ensuring that the notches in the rocker arm shafts face upward when assembled to prevent damage to the rocker arms.

Make sure the pushrods seat properly in the rocker arms as the bolts are tightened.

Apply moly-base grease to the ends of the valve stems, the upper ends of the pushrods, and the rocker arm shaft.

To extract the dowel pins from each pedestal for further inspection, use a 4 mm screw and nut along with a washer and spacer as a puller. Note that new dowel pins must be installed during reassembly.

A universal shaft-type valve spring compressor.

Make sure the pushrods seat properly in the rocker arms as the bolts are tightened.

Mark the rocker arms and pedestals for proper identification.

Support the camshaft with V-blocks and rotate it while noting the indicator reading.