Subaru 2004 LEGACY, Service Manual

Page: 599 / 609

PS-80
POWER ASSISTED SYSTEM (POWER STEERING)
Oil Pump
C: INSPECTION
1. BASIC INSPECTION
Perform the following inspection procedures and replace defective parts.
2. SERVICE LIMIT
Make a measurement as follows. If it exceeds the
service limit, replace with a new one.
CAUTION:
• When securing the oil pump on a vice, hold
the oil pump with the least possible force be-
tween two wood pieces.
• Do not set outside of flow control valve or
pulley on a vice; otherwise outside or pulley
might be deformed. Select properly sized wood
pieces.
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
Axial play (Direction )
0.9 mm (0.035 in) or less
No. Parts INSPECTION Corrective action
1 Oil pump (Exterior)
(1) Crack, damage or oil leakage Replace the oil pump with a new one.
(2) Play of pulley shaft
Measure the radial play and axial play.
If any of these exceeds the service limit, replace the
oil pump with a new one.
2 Pulley
(1) Damage Replace with a new one.
(2) Bend
Measure the V ditch deflection.
If it exceeds the service limit, replace the pulley with a
new one.
3 Oil pump (Interior)
(1) Defect or burning of vane pump
Check the resistance to the rotation of pulley.
If it exceeds the service limit, replace the oil pump with
a new one.
(2) Bend in the shaft or damage to
bearing
Oil pump emits a noise that is markedly different in
tone and loudness from a sound of a new oil pump
when turning its pulley which is put around with a
string, replace the oil pump with a new one.
4 O-ring Crack or deterioration Replace with a new one.
5 Bracket Crack Replace with a new one.
(1) Dial gauge
(1) Dial gauge
PS-00145
P
(1)
PS-00146
P
(1)