Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 165
ME(w/o STI)-41
V-belt
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.
(2) The rib of the rear side belt is securely
placed on the groove of the crank pulley.
(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-04656
(4)
(2)
(3)
(1)
90
ME-04678
ME-04679
ME-04673
ME-04139
ME(w/o STI)-42
V-belt
MECHANICAL
12) 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.
(1) The rear side belt is not twisted.
(2) The rib of the rear side belt is securely
placed on the groove of the A/C compressor
pulley.
(3) The rib of the rear side belt is securely
placed on the groove of the crank pulley.
(4) The surface of the rear side belt is held by
the belt stopper.
(5) The rear side belt is securely placed on the
belt guide.
ME-04657
(2)
(4)
(1)
(5)
(3)
90
ME-04674
ME-04678
ME-04679
ME-04673
ME-03530
ME(w/o STI)-43
V-belt
MECHANICAL
13) Slowly turn the crank pulley clockwise, and in-
stall the rear side belt.
CAUTION:
Be careful that the total of procedures 8), 11),
12) and 13) does not exceed 330°; failure to do
so may cause damage to the rear side belt and
fall of the belt guide holder.
14) Remove the belt guide and belt guide holder
from the crank pulley.
15) Remove the belt stopper from the compressor
bracket.
CAUTION:
Always remove the belt stopper; failure to do so
may cause smoke, fire, or belt cutting.
16) Make sure that the belt rib is securely installed
on the groove of each pulley, then turn the crank
pulley slowly, twice in the clockwise direction, to
seat the rear side belt properly.
17) Discard the provided tools (belt stopper, belt
guide, belt guide holder, and bolt) that are used.
18) Install the front side belt. <Ref. to ME(w/o STI)-
38, FRONT SIDE BELT, INSTALLATION, V-belt.>
330
ME-03510
ME-03526
ME-04675
ME-03511
360 x2
ME(w/o STI)-44
V-belt
MECHANICAL
C: INSPECTION
1. FRONT SIDE BELT
CAUTION:
Check and adjust the front side belt tension so
that it is within the specified range. Using the
belt with a tension out of the specified range
may result in a fault such as the following:
• If the front side belt tension is higher, unex-
pected force is generated at the power steering
oil pump, generator and crankshaft bearing,
causing abnormal noise due to abnormal wear
of the bearing.
• If the front side belt tension is lower, the front
side belt and crank pulley slip, causing abnor-
mally high temperature on the crank pulley due
to frictional heat. If this condition repeatedly
occurs, the front side belt may abnormally
wear, causing abnormal noise, front side belt
damage or crank pulley damage.
1) Replace the front side belt, if crack, fraying or
wear is found.
2) Check the front side belt tension and adjust it if
necessary by changing the generator installing po-
sition.
Front side belt tension (with belt tension
gauge):
When installing new parts
640 — 780 N (65 — 80 kgf, 144 — 175 lbf)
At inspection
490 — 640 N (50 — 65 kgf, 110 — 144 lbf)
Front side belt tension (without belt tension
gauge):
When installing new parts
7 — 9 mm (0.276 — 0.354 in)
At inspection
9 — 11 mm (0.354 — 0.433 in)
2. REAR SIDE BELT
Replace the rear side belt, if crack, fraying or wear
is found, or noise is emitted.
NOTE:
For the rear side belt, a stretch type belt is used,
and therefore, it is not necessary to check deflec-
tion nor tension.
(A) Front side belt
(B) Rear side belt
C/P Crank pulley
GEN Generator pulley
P/S Power steering oil pump pulley
A/C A/C compressor pulley
ME-03313
C/P
P/S
A/C
GEN
(A)
(B)
(A) Front side belt
(B) Rear side belt
(C) 98 N (10 kgf, 22 lbf)
C/P Crank pulley
GEN Generator pulley
P/S Power steering oil pump pulley
A/C A/C compressor pulley
ME-03314
(A)
(B)
GEN
C/P
A/C
P/S
(C)
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