Impreza WRX STI F4-2.5L DOHC Turbo (2007)
5) Align the single line mark (A) on exhaust cam sprocket (LH) with notch (B) on timing belt cover by turning the sprocket counterclockwise (as
viewed from front of engine).
6) Align the single line mark (A) on intake cam sprocket (LH) with notch (B) on timing belt cover by turning the sprocket clockwise (as viewed from
front of engine). (Make sure that the double line marks (C) on intake and exhaust cam sprockets are aligned.)
7) Make sure that the cam and crank sprockets are positioned properly.
CAUTION:
^
Intake and exhaust camshafts for this DOHC engine can be independently rotated with the timing belts removed. As can be seen from the
figure, if the intake and exhaust valves are lifted simultaneously, the valve heads will interfere with each other, resulting in bent valves.