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Oil Pump: Inspection

WARNING: This page is about a different car, the 2003 Subaru Outback, 2003 Subaru Legacy, and 2003 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check seal ring and O-ring oil seal for breaks or damage.
  2. Check other parts for dents or abnormalities.
  3. Selection of oil pump rotor assembly
    1. Tip clearance

      Install inner rotor and outer rotor to oil pump. With rotor gears facing each other, measure crest-to-crest clearance.

      1. Tip clearance:  0.02-0. mm (0.0008-0.0059 in)
        Fig 1: Installing Inner & Outer Rotor To Oil Pump
        G02875983Courtesy of SUBARU OF AMERICA, INC.
    2. Side clearance

      Set a depth gauge to oil pump housing, then measure oil pump housing-to-rotor clearances.

      1. Side clearance:  0.02-0.04 mm (0.0008-0.0016 in)
        Fig 2: Measuring Oil Pump Housing-To-Rotor Clearances
        G02875984Courtesy of SUBARU OF AMERICA, INC.
    3. If depth and/or side clearances are outside specifications, replace rotor assembly.
      OIL PUMP ROTOR ASSEMBLY

      Part No. Thickness mm (in)
      15008AA060 11.37-11.38 (0.4476-0.4480)
      15008AA070 11.38-11.39 (0.4480-0.4484)
      15008AA080 11.39-11.40 (0.4484-0.4488)

      Measure the total end play and adjust to within specifications. < Ref. to ADJUSTMENT , Oil Pump.>

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