Oil Pump Assembly: Inspection

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: 0.02 - 0.15 mm (0.0008 - 0.0059 in)
  
  Fig 1: Measuring Crest To Crest Clearance
2. Side clearance
  Set a depth gauge to oil pump housing, then measure oil pump housing-to-rotor clearances.
  
  Side clearance: 0.02 - 0.04 mm (0.0008 - 0.0016 in)
  
  Fig 2: Measuring Oil Pump Housing To Rotor Clearances
3. If depth and/or side clearances are outside specifications, replace rotor assembly.
  
  Fig 3: Oil Pump Rotor Assembly Specifications