Jeep 4777976AA Valve Lash Tappet

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The valve lash adjuster is an integral part of each rocker arm and cannot be replaced separately. Begin by removing the rocker arm shafts without detaching the rocker arms from the shafts. Next, turn the rocker arm assembly upside down on the workbench and inspect each lash adjuster for signs of wear and damage, especially on the surface that contacts the valve tip. Since lash adjusters often become clogged, it is advisable to replace the rocker arm/lash adjuster assembly if there are concerns about their condition or if the engine is making valve "tapping" noises. If any lash adjusters were removed, reassemble the rocker arms onto their shafts. Ensure that the lash adjusters are partially filled with engine oil, which is indicated by minimal plunger action when depressed. If there is excessive plunger travel, immerse the rocker arm assembly in clean engine oil and pump the plunger until the travel is eliminated. If the plunger still moves within the rocker arm when filled with oil, it is defective, and the rocker arm assembly must be replaced. Upon restarting the engine after replacing the rocker arm/lash adjusters, expect the adjusters to make "tapping" noises. After warming up, increase the engine speed from idle to 3,000 rpm for one minute; if the adjusters do not become silent, replace the defective rocker arm/lash adjuster assembly.

It indicates that the lash adjuster is defective and needs replacement.

To remove the lifters, first take off the intake manifold and valve covers, followed by the rocker arms and pushrods, and then the cylinder heads from the engine block. After removing the retaining plate bolts, lift the plate to access the hydraulic roller lifters, which are retained with an alignment yoke that should be lifted off.

Yes, used roller lifters can be reinstalled with a new camshaft, or the original camshaft can be reused if the lifters are new and in good condition.

It is crucial to avoid mixing them up, so marking them or placing them in a labeled container is recommended.

After reinstalling the lifters, run the engine to check for oil leaks.

While holding the check ball down, move the rocker arm up and down to check for freeplay. There should be a small amount of movement; if there is no freeplay, you should replace the adjuster with a new unit.

Inspect them for damage and address any lubrication issues before installing new components.

Each adjuster, especially the ball tip that contacts the rocker arm, should be examined as they can become clogged.