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Service Limit

Make a measurements as follows. If it exceeds the service limit, replace with a new part.

CAUTION:

When securing the oil pump on a vise, hold the oil pump with the least possible force between two pieces of wood.
Do not set the outside of flow control valve or pulley on a vise; otherwise outside or pulley might be deformed. Select properly sized wood pieces.

Play of the pulley shaft
Condition:

P: When applying the force of 9.8 N (1.0 kgf, 2.2 lb)

Service limit:

Play in the radial direction (Direction <= =>) 0.2 mm (0.008 in) or less

Fig 1: Measuring Pulley Play With Dial Gauge (Radial Play)
Courtesy of SUBARU OF AMERICA, INC.

Axial play (Direction <= =>)

0.6 mm (0.024 in) or less

Fig 2: Measuring Pulley Play With Dial Gauge (Axial Play)
Courtesy of SUBARU OF AMERICA, INC.
Deflection of the pulley groove
Service limit:

1.0 mm (0.039 in) or less

NOTE: Read the value for one surface of V ditch, and then the value for another off the dial.

Fig 3: Rotating Resistance Of Pulley
Courtesy of SUBARU OF AMERICA, INC.
Rotating resistance of pulley
Service limit:

Maximum load: 9.22 N (0.94 kgf, 2.071b) or less
NOTE:
- A rather higher value may be indicated when pulley starts turning.
- Measure the load during rotation to make a judgment.
  
  Fig 4: Identifying Spring Scale
  Courtesy of SUBARU OF AMERICA, INC.