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Disassembly & Inspection

  1. Disassemble pump. See Fig 1. Measure tip clearance of rotors. See OIL PUMP SPECIFICATIONS  table. If clearance is not as specified, replace rotors as a matched set.
    Fig 1: Identifying Oil Pump Components
    G91H02408Courtesy of SUBARU OF AMERICA, INC.
    OIL PUMP SPECIFICATIONS

    Application In. (mm)
    Inner Rotor-To-Pump Cover Side Clearance
    Standard .0008-.0028 (.020-.070)
    Service Limit .0059 (.150)
    Inner Rotor Tip-To-Outer Rotor Clearance
    Standard .0016-.0055 (.040-.140)
    Service Limit .0071 (.180)
    Outer Rotor-To-Case Clearance
    Standard .0039-.0069 (.100-.175)
    Service Limit .0079 (.200)
    Relief Valve Spring (1)
    Free Length 2.83 (71.8)
    Installed Length 2.15 (54.7)
    (1) Relief valve spring installed load is 17.33 lbs. (7.86 kg).
  2. Measure clearance between outer rotor and oil pump cylinder block rotor housing. If case clearance is not as specified, replace rotor. See OIL PUMP SPECIFICATIONS  table.
  3. Using a straightedge, measure clearance between oil pump inner rotor and pump cover. If clearance is not as specified, replace rotor or pump body. See OIL PUMP SPECIFICATIONS  table.
  4. Check oil relief valve and relief spring for wear and damage. Check oil pump case for worn shaft hole, clogged oil passage, worn rotor chamber and cracks. Check oil seal lips for deformation, hardening and wear. Replace components as necessary.
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