Oil Pump Housing: Inspection

1. Tip clearance

   Install the inner rotor and outer rotor to the oil pump. 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 Oil Pump Housing 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 - 0.04 mm (0.0008 - 0.0016 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 oil pump rotor assembly.

Check the total end play and adjust it to be within specifications. < Refer to ADJUSTMENT , Oil Pump Housing. >