Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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)