Subaru 2004 IMPREZA Service Manual page 38

POWER ASSISTED SYSTEM (POWER STEERING)
7) Tighten the bolt of belt tension.
Tightening torque:
25 N·m (2.5 kgf-m, 18.1 ft-lb)
8) Install the pulley belt cover.
9) Connect the battery ground cable to battery.
10) Feed the specified power steering fluid. <Ref.
to PS-86, Power Steering Fluid.>
CAUTION:
Never start the engine before feeding the fluid;
otherwise vane pump might be seized up.
C: INSPECTION
1. BASIC INSPECTION
Perform the following inspection procedures and repair or replace defective parts.
No. Parts
1 Oil pump (Exterior)
2 Pulley
3 Oil pump (Interior)
4 O-ring
5 Bracket
2. SERVICE LIMIT
Make a measurement as follows. If it exceeds the
specified service limit, replace the parts with new
ones.
CAUTION:
• Fix the oil pump on a vise to make a measure-
ment. At this time, hold the oil pump with least
possible force between two wood pieces.
• Do not set outside of flow control valve or
pulley on a vise; otherwise outside or pulley
might be deformed. Select properly sized wood
pieces.
Oil Pump
Inspection
(1) Crack, damage or oil leakage
(2) Play of pulley shaft
(1) Damage
(2) Bend
(1) Defect or burning of vane pump
(2) Bend in the shaft or damage to
bearing
Crack or deterioration
Crack
PS-82
Corrective action
Replace the oil pump with a new one.
Measure the radial play and axial play.
If any of these exceeds the service limit, replace the
oil pump with a new one.
Replace it with a new one.
Measure the V ditch deflection.
If it exceeds the service limit, replace the pulley with a
new one.
Check the resistance to rotation of pulley.
If it is past the service limit, replace the oil pump with a
new one.
Oil pump emits a noise that is markedly different in
tone and loudness from a sound of a new oil pump
when turning with a string put around its pulley,
replace the oil pump with a new one.
Replace it with a new one.
Replace it with a new one.
1) Play of the pulley shaft
Condition:
P: When applying the force of 9.8 N (1.0 kgf,
2.2 lb)
Service limit:
Radial play (Direction
0.4 mm (0.016 in) or less
P
(1) Dial indicator
)
(1)
PS-00145