A cordless drill will work for a little bit, but you may be better off with a larger electric drill. Make sure all your oil lines are connected and the oil pressure switch is on or this step will send oil everywhere. We attached the drill and spun it counterclockwise to build oil pressure in the motor. Then we made sure all the rockers had a good flow of oil running out the top. If for some reason you don’t get oil flow to all of the rockers, slowly turn the motor over by hand and continue until all rockers are flowing.