Subaru 2009 IMPREZA Service Manual page 76

PERIODIC MAINTENANCE SERVICES
6. V-belt
A: INSPECTION
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.
NOTE:
Since the rear belt is a stretch type belt, it does not
require tension adjustment.
1. PROCEDURE (WITHOUT BELT
TENSION GAUGE)
1) Replace the belts if cracks, fraying or wear are
found.
2) Check the V-belt tension and adjust it if neces-
sary by changing the generator installing position
or idler pulley installing position. <Ref. to PM-13,
REPLACEMENT, V-belt.>
Belt tension
(A)
When replacing: 7 — 9 mm (0.276 — 0.354 in)
When reusing: 9 — 11 mm (0.354 — 0.433 in)
(B)
When replacing: 7.5 — 8.5 mm (0.295 — 0.335 in)
When reusing: 9.0 — 10.0 mm (0.354 — 0.394 in)
GEN
P/S
C/P Crank pulley
GEN Generator pulley
P/S Power steering oil pump pulley
A/C A/C compressor pulley
A/C
C/P
PM-00401
V-belt
2. PROCEDURE (WITH BELT TENSION
GAUGE)
1) Replace the belts if cracks, fraying or wear are
found.
2) Remove the V-belt covers and radiator reservoir
tank.
3) Check the belt tension, using the belt tension
gauge. Adjust the tension, if necessary by chang-
ing the generator installing position or idler pulley
installing position.
Belt tension (non-turbo model)
When installing new parts:
640 — 780 N (65 — 80 kgf, 144 — 175 lbf)
At inspection:
490 — 640 N (50 — 65 kgf, 110 — 144 lbf)
Belt tension (turbo model)
When installing new parts:
640 — 780 N (65 — 80 kgf, 144 — 175 lbf)
At inspection:
490 — 640 N (50 — 65 kgf, 110 — 144 lbf)
P/S
C/P Crank pulley
GEN Generator pulley
P/S Power steering oil pump pulley
A/C A/C compressor pulley
PM-12
A/C
GEN
C/P
PM-00402