Mopar 53021913AB Rocker Arm Valve

To do this you will need to remove the valve covers from the cylinder heads and the bolts that hold the rocker arm shafts in place and these bolts are the center bolts followed by the bolts at the extremity of the rocker arm shafts. After the last nut is fully loosened, carefully lift the rocker shaft assembly off of the cylinder head, being sure note the position betwen the upper intake and lower exhaust rocker arms so that they can be reassembled in their original orientation. Rocker arm positions should be recorded in order to reinstall them in the correct position; each set of components should be replaced and stored as they were found; and the pushrods should be removed and stored in an order to avoid crossing them up. It is important for one to note that exhaust pushrods are a little longer than intake pushrods not interchangeable. If the cylinder heads have been machined to a standard of flatness then it is crucial to 'shorten' the appropriate length pushrods to cover the now shorter distances of the rocker arms to the camshaft dimensions, unless consulting with a machine shop. For each rocker arm, check if there is wear, cracks, and damage on the surface that comes into contact with pushrods and or valve stems, and the rocker arm shafts and the bores should also be checked to establish if they have worn out and or damaged, a worn out or damaged part must be replaced. There must be free passage into the hole at the pushrod end of each rocker arm; bears checking for crackline and abnormal wear, pushrods can be rolled across a flat surface to check for bend. Coat the lower end of each pushrod with clean engine oil or assembly lube and install these into their original position and ensure that it seals fully into the lifter socket. Coat the valve stems and the upper ends of the pushrods with assembly lube for protection of any mating surfaces during initial start up, then lubricate the rocker shafts, the rocker shaft assembly should have all components located in their original positions before being installed in to the head of the cylinder. Tighten the rocker arm shafts beginning with the centre bolt, in a preset sequence till the appropriate torque is secured so that the pushrods fit tightly in the rocker arms. If bolts when installed appear light before the shaft is seated or if pushrods bind, all the components inside should be examined. Last, put the valve covers back on, crank up the engine, scan for valve train rattles and knock and look for oil leaks at the gaskets.

A special valve spring compressor from most aftermarket specialty tool manufacturers is necessary 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 non-freewheeling, requiring the pistons to 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 the ignition system is disabled by disconnecting the primary electrical connectors at the ignition coils and removing the 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 to position the pistons correctly for rocker arm removal from the corresponding cylinders. 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, keeping the rocker arm and lash adjuster together for reinstallation. After removing the rocker arms, pull out the lash adjusters and store them with the corresponding rocker arms. Inspect each rocker arm for wear, cracks, and damage, ensuring the rollers turn freely and checking the pivot area for any issues. Also, inspect the lash adjuster contact surfaces for wear or damage, confirming that they move freely in their bores without excessive play. Installation follows the reverse order of removal, with the exception that the lash adjuster should be installed first, ensuring they are at least partially full of oil, indicated by minimal lash adjuster plunger travel.