Jeep 53021894AA Engine Valve Lifter-Adjuster

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A special valve spring compressor from most aftermarket specialty tool manufacturers is required for this procedure, as the only alternative involves major disassembly of the engine and surrounding components by removing the timing chains and camshafts. This engine is a non-freewheeling (interference) engine, necessitating that the pistons be down in the cylinder bore before compressing the valve and spring assembly to allow for rocker arm removal. Before starting, ensure the transmission is in Park, the parking brake is applied, or the rear wheels are blocked, and remove the ignition coils and spark plugs. Remove the valve cover(s) and label and store the rocker arms and lash adjusters for reinstallation on the same valves. Rotate the engine clockwise by the crankshaft pulley/vibration damper bolt until the pistons are positioned correctly for rocker arm removal, starting from TDC number 1 on the compression stroke. For the 3.7L V6 engine, remove rocker arms from cylinders No. 2 and 6 with the No. 1 piston at TDC, then rotate the crankshaft another 180 degrees to remove the rocker arm from cylinder No. 1, followed by cylinders No. 3 and 5, and finally cylinder No. 4. For the 4.7L V8 engine, follow a similar process, removing rocker arms from cylinders No. 2 and 8, then No. 3 and 5, followed by No. 4 and 6, and finally No. 1 and 7. Use the valve spring compressor to relieve tension on the rocker arm for removal, and if only a few rocker arms or lash adjusters are being replaced, locate the corresponding cylinder number and rotate the crankshaft accordingly. After removing the rocker arms, pull out the lash adjusters and store them with their corresponding rocker arms. Inspect each rocker arm for wear, cracks, and damage, ensuring the rollers turn freely, and check the lash adjuster contact surfaces for wear or damage, confirming they move freely without excessive play. Installation is the reverse of removal, ensuring lash adjusters are installed first and are at least partially full of oil to minimize plunger travel.

To undertake this procedure, you will need a particular valve spring compressor. An alternative is to dismantle the engine heavily removing the timing chains and camshafts. Before commencing start by placing the transmission in park, apply parking brake or block the rear wheels and disable the ignition system. Remove the valve cover(s). Separate and put away rocker arms and lash adjusters properly labeled. Rotate engine's crankshaft clockwise until pistons are at their correct positions. Remove rocker arms from cylinders 2, 6, 1, 3 and 5 of V6 engines.Remove rocker arms from cylinders 2,8 ,3 ,5 ,4 ,6 ,1 and 7 of V8 engines.Depress the valve spring using a valve spring compressor then pull out a rocker arm.In case you are replacing or removing just several adjusters or rockers arm then turn your crankshaft into proper position only.keep them with matching groups of them.Once the rocker arms are removed, pull out the lash adjusters and store them with the corresponding rocker arm.Examine if there is wear cracks or damages on such parts like Rocker Arms And Lash Adjusters.Start by installing oil filled Lash Adjustors first but not fully full.

A special valve spring compressor from most aftermarket specialty tool manufacturers is required for this procedure, as the only alternative involves major disassembly of the engine and surrounding components by removing the timing chains and camshafts. This engine is a non-freewheeling (interference) engine, necessitating that the pistons be down in the cylinder bore before compressing the valve and spring assembly to allow for rocker arm removal. Before starting, ensure the transmission is in Park, the parking brake is applied, or the rear wheels are blocked, and remove the ignition coils and spark plugs. Remove the valve cover(s) and label and store the rocker arms and lash adjusters for reinstallation on the same valves. Rotate the engine clockwise by the crankshaft pulley/vibration damper bolt until the pistons are positioned correctly for rocker arm removal, starting from TDC number 1 on the compression stroke. For the 3.7L V6 engine, remove rocker arms from cylinders No. 2 and 6 with the No. 1 piston at TDC, then rotate the crankshaft another 180 degrees to remove the rocker arm from cylinder No. 1, followed by cylinders No. 3 and 5, and finally cylinder No. 4. For the 4.7L V8 engine, follow a similar process, removing rocker arms from cylinders No. 2 and 8, then No. 3 and 5, followed by No. 4 and 6, and finally No. 1 and 7. Use the valve spring compressor to relieve tension on the rocker arm for removal, and if only a few rocker arms or lash adjusters are being replaced, locate the corresponding cylinder number and rotate the crankshaft accordingly. After removing the rocker arms, pull out the lash adjusters and store them with their corresponding rocker arms. Inspect each rocker arm for wear, cracks, and damage, ensuring the rollers turn freely, and check the lash adjuster contact surfaces for wear or damage, confirming they move freely without excessive play. Installation is the reverse of removal, ensuring lash adjusters are installed first and are at least partially full of oil to minimize plunger travel.

Clean the lifters and check for wear, ensuring that if new lifters are installed, a new camshaft must also be used.

Remove the lifter rail mounting bolts and the lifters from the lifter bores in the engine block, ensuring each lifter is installed back into the same bore and direction, marking them appropriately.

Remove all tappet retaining dowels or clamps and proceed with the reassembly of pushrods, rocker arms, and other components. Adjust the valve clearance and complete the installation process, including changing the engine oil and filter. If the side cover was removed, install it with a new gasket.

Use a long bolt as a handle to carefully pull the camshaft out while turning it.

With the tappets secured, remove the camshaft thrust plate bolts, carefully pull out the camshaft, and retrieve the tappets using a special tool. After removal, inspect the camshaft and tappets for wear, damage, and measurements. Replace components as needed.

Lubricate the camshaft bearing journals and lobes with camshaft installation lube.

Place the transmission in Park, apply the parking brake or block the rear wheels, and disable the ignition system.