To replace the Valve Stem Oil Seal and also the valve spring, start with the removal of the valve Rocker Arm cover then also, the required valve Rocker Arm and spark plugs. Insert the j 22794 (Spark Plug Port Adapter) into the hole of the spark plugs and then attach a shop air supply hose for compressions air forcing the valves in place. A bolt from a valve Rocker Arm applied, place a flat washer on the bolt, and then screw the bolt into the valve Rocker Arm bolt hole for the valve spring requiring removal. Be careful with compressed valve springs that are under high tension. Compress the valve spring using the j 5892-d (Valve Spring Compressor) by placing its slotted end under the washer on the valve Rocker Arm bolt and apply steady pressure until the valve keys are accessible. If the above shader doesn't fit, then use the j 38606 (Valve Spring Compressor) instead, ensuring it has its jaws fully in contact to avoid scratching the valve spring. Removal of the valve keys, then releasing of valve spring tension, then the removal of the j 5892-d or j 38606, then the removal of the valve spring cap and valve spring. For installation, install the valve into the correct valve guide, choose a correct Valve Stem Oil Seal, lubricate the seal and valve guide with clean engine oil, and install the Valve Stem Oil Seal using the j 42073 (Valve Stem Seal Installer), tapping it until it bottoms against the valve spring seat while maintaining a 1-2 mm clearance between seal and valve guide. Finally, go ahead and install the valve spring and the valve spring cap followed by compressing the valve spring once more with your j 5892-d or j 38606, as necessary. Install the valve stem o-ring seal and valve stem keys with grease in place on the keys, and carefully relieve the valve spring pressure to make the keys seat in the correct location in the valve spring cap. Finally, remove the j 5892-d or j 38606, verify that the valve stem keys that are seated, tap the valve stem if needed, remove the j 22794 and reinstall the spark plugs, valve rocker arms, and valve Rocker Arm cover.