Impreza GT F4-2.5L Turbo (2009)
9) Remove the ST GUIDE, and form the seal ring properly using ST FORMER.
ST 34199AG070 FORMER
10) Put vinyl tape around pinion shaft spline to protect oil seal from damage.
11) Install the valve to pinion, and install the snap ring.
12) Attach the pinion & valve assembly into the valve housing.