You need to install the valve stem seal, the
Valve Spring, the valve spring retainer, the EN 46110 above the applicable valve spring as shown, and the valve spring keepers, remove the EN 46110, disconnect the J 39313 from the compressed air source, remove the J 39313, install the spark plugs and the rocker arms and camshafts, remove the EN 46106, and then install the starter motor.