Oil Pump: Inspection

WARNING: This page is about a different car, the 2001 Subaru Outback, 2001 Subaru Legacy, 2001 Subaru Impreza, and 2001 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Check seal ring and O-ring oil seal for breaks or damage.
Check other parts for dents or abnormalities.
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.
  
  Tip clearance:
  1. 0.02 - 0.15 mm (0.0008 - 0.0059 in)
    
    Fig 1: Checking Tip Clearance
2. Side clearance
  Set a depth gauge to oil pump housing, then measure oil pump housing-to-rotor clearances.
  
  Side clearance:
  1. 0.02 - 0.04 mm (0.0008 - 0.0016 in)
    
    Fig 2: Checking Side Clearance
3. If depth and/or side clearances are outside specifications, replace rotor assembly.
  
  Fig 3: Oil Pump Rotor Assembly, Selection Chart
- Measure the total end play and adjust to within specifications. See ADJUSTMENT .