Oil Pump

Check the following items.

• Oil pump cover and oil seal for breakage or damage
• Oil pump body for scratch or damage

1. Check the seal ring and oil seal for breaks and damage.
2. Check other parts for dents or faults.
3. Oil pump rotor assembly selection
   1. Tip clearance

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

      Tip clearance: 

      0.02 - 0.15 mm (0.0008 - 0.0059 in) 

      Fig 1: Measuring Crest-To-Crest Clearance

      Courtesy of SUBARU OF AMERICA, INC.
   2. Side clearance

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

      Side clearance: 

      0.02 - 0.045 mm (0.0008 - 0.0018 in) 

      Fig 2: Measuring Oil Pump Housing-To-Rotor Clearance

      Courtesy of SUBARU OF AMERICA, INC.
   3. If the tip and/or side clearance are not within the specification, replace the rotor assembly.

      Oil pump rotor assembly
      Part No.	Thickness mm (in)
      15008AA130	11.37 - 11.38 (0.4476 - 0.4480)
      15008AA140	11.38 - 11.39 (0.4480 - 0.4484)
      15008AA150	11.39 - 11.40 (0.4484 - 0.4488)

      Check the total end play and adjust it to be within specifications. Refer to ADJUSTMENT .