Subaru WRX & WRX STI Manuals 2015 WRX & WRX STI Owner's Manual | Page 434

Maintenance and service/Drive belts

Drive belts

side belt and if there is any looseness, cracks, wear or unusual noise
on the front side belt, contact your
SUBARU dealer.
Continuing to use the vehicle with
the belt outside of the specification
may cause the engine to malfunction and the above components to
malfunction.

NOTE
For models except STI, it is unnecessary to check the deflection of the drive
belt periodically because this engine is
equipped with an automatic belt tension adjuster. However, replacement of
the belt should be done according to
the maintenance schedule in the “Warranty and Maintenance Booklet”. Consult your SUBARU dealer for replacement.
If the drive belt is loose, cracked or
worn, contact your SUBARU dealer.

11-21

STI
1)
2)
3)
4)
5)
6)
A)

Power steering oil pump pulley
Front side belt
Alternator pulley
Air conditioner compressor pulley
Rear side belt
Crank pulley
22 lbf (98 N, 10 kgf)

To check the deflection of the front side
belt, place a straightedge (ruler) across
two adjacent pulleys (alternator pulley and
crank pulley) and apply a force of 22 lbf
(98 N, 10 kgf) midway between the pulleys
by using a spring scale. The belt deflection should be the amount specified. If the
front side belt is loose, cracked or worn,
contact your SUBARU dealer.
in (mm)
Deflection
New belt

CAUTION
The front side belt, which runs in
conjunction with the following components, must be used within the
specified deflection.
. Power steering oil pump pulley
. Alternator pulley
. Crank pulley
Check the deflection of the front

A

Used belt

0.28 – 0.35
(7.0 – 9.0)

0.35 – 0.43
(