2006 GMC Yukon Valve Stem Oil Seal

You need to remove the rocker's arm, disconnect the spark plug wire at the spark plug, loosen the spark plug 1 or 2 turns, brush or air blast away any dirt or debris from around the spark plug, remove the spark plug, install the J 22794, attach an air hose to the J 22794, apply compressed air to the J 22794 to hold the valves, compress the valve spring, remove the valve stem keys, release the valve spring tension, remove the J 38606, the valve spring cap, the valve spring, and the valve stem oil seal and shim.

You need to twist each plug wire boot 1/2 turn and pull only on the boot to remove the wire from the spark plug.