Subaru 2009 IMPREZA Service Manual page 260

MECHANICAL
11) While checking the following, slowly turn the
crank pulley approximately 90° clockwise so that the
belt guide comes to the position shown in the figure.
CAUTION:
When turning the crank pulley, always make
sure that the belt guide is not off from the crank
pulley groove.
(1) The rib of the rear side belt is securely
placed on the groove of the A/C compressor
pulley.
NG
(2) The rib of the rear side belt is securely
placed on the groove of the crank pulley.
NG
(2)
(1)
(3) (2)
90
(2)
(4)
ME-03508
OK OK O O O O K K K K
ME-03516
OK
ME-03518
ME(H4SO)-42
V-belt
(3) The surface of the rear side belt is held by
the belt stopper.
(4) The rear side belt is securely placed on the
belt guide.
ME-03513
ME-03531