GM 10240898
Valve Springs

You need to remove the valve rocker arm covers and spark plugs first to fix the valve guide seal. Insert the Spark Plug port adapter j 22794 into the Spark Plug hole while using compressed air to position the valves effectively. Fit the valve rocker arm nut afterward use the j 5892-d valve spring compressor tool to compress the valve spring but switch to the j 38606 tool when clearance demands it. To eliminate the pressure on the valve spring first pull off the valve stem keys and then loosen the spring tension with the j 5892-d or j 38606. Use the removal tools to extract the valve spring cap first and then the valve spring. Next pull out the valve stem oil seal. Choose the right valve stem oil seal according to valve guide specifications and install the valve spring before placing the valve spring cap. In any instance use the j 5892-d or j 38606 valve spring compressors. Press the valve spring pressure into place while applying grease on the valve stem keys before loosening the valve spring pressure carefully. After taking away j 5892-d or j 38606 replace the spark plugs and put back valve rocker arm covers.

Start your work by disconnecting the battery negative cable before you begin to service all parts of the valve system. Before adding compressed air into the service cylinder, take off the valve Rocker Arm cover from the Cylinder Head and turn the Crankshaft with both valves shut. Keep the cylinder in bottom position before starting valve service to stop engine rotation. Separate the valve Rocker Arm system from the Cylinder Head then uninstall push rod spark plugs. Put the Spark Plug port adapter (J 22794) in the Spark Plug port then blow compressed air through the cylinder to shut valves before gently hitting the valve spring retainer to free the keepers. After installing the valve spring compressor (J 5892-C) onto the Cylinder Head connect the valve Rocker Arm bolt to secure it during spring compression. With the compressor pressurized the valve spring assembly becomes compressed so valve keepers can be pulled off without releasing the air. Relax the compressed spring pressure afterward take out the compressor unit then the valve spring retainer and spring from engine head finally extract the valve stem seal from its valve guide. After positioning the new valve stem oil seal on the valve guide put in the valve spring retainer then the spring. The valve spring compressor tool j 5892-c helps place valve springs and keepers. During installation always apply compressed air and grease to retain the keepers securely. Once finished use the compressor to release the tension then take off the equipment and escape the compressed air. Reconnect the battery before putting back all components including spark plugs and valve rocker assembly pieces.

Before replacing the valve stem oil seal and valve spring, take out the valve rocker arms from the Cylinder Head and the spark plugs. Slide the (J22794) into the Spark Plug hole, then use compressed air to keep the valves secured. Attach an m8 bolt (J5892-D) to the valve Rocker Arm using a washer, then use (J38606) to add more compression to the valve spring. First take out the (J21058) valve stem keys, then release the spring pressure from the valve and in the end, take the (J62681) compressor, (J38606) valve spring cap, (J28861) valve spring and (J50572) valve stem oil seal off. Take the valve spring shim out if the manual tells you to. Before anything else, put the valve spring shim in place if you have one and when assembling the valve stem oil seal onto the guide, make certain they are aligned to reduce both oil use and harm to the parts. Apply clean engine oil to the valve guide and oil seal and fit the seal over the valve stem down into position. Apply pressure on the object (J42073) to fit the oil seal into position against the valve spring shim or spring seat. After that, place the valve spring and the valve spring cap, snugly compress the valve spring using tool j5892-d or j38606 and fit the valve keys using a thin layer of grease. With the valve pressure released, see that the keys stay in place and remove (J5892-D) and (J22794) carefully. You should install the spark plugs and valve rocker arms in the final step.