Jeep 53021720AD Hydraulic Engine Lifters And Yoke

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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.

Gradually loosen each rocker arm shaft bolt until they can be hand-removed as an assembly, making sure to loosen them in the reverse order of the tightening sequence.

They should be kept together and reinstalled in the same locations.

Lubricate the lifters with clean engine oil and place them in the block, ensuring the original lifters are returned to their original locations with numbers facing up. Install the lifter rail and its mounting bolts.

During the inspection of the camshaft, you should check the bearing journals for wear, pitting, and seizure evidence. Measure the bearing journal diameter with a micrometer. Measure the lobe height of each cam lobe, both intake and exhaust, and check for discoloration, scoring, chipping, pitting, or uneven wear on the camshaft lobes.

Before removing the camshaft, check the endplay with a dial indicator and record the movement.

Inspect the rocker arm pivot area and shaft for wear, cracks, and galling, and replace any worn or damaged rocker arms or shafts.

Use a socket and ratchet attached to the crankshaft pulley bolt, and rotate the engine in a clockwise direction until the cam lobe for the rocker arm to be removed is located on its base circle.

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

Lubricate the shafts and reinstall them in their marked order, ensuring that intake rockers remain on the intake shaft and exhaust rockers on the exhaust shaft, with notches in the rocker arm shafts facing up to prevent damage.

Before starting, if the vehicle is equipped with air conditioning and you plan to remove the camshaft with the engine in place, have the air conditioning system discharged by a professional.

Relieve the fuel system pressure and disconnect the battery.