Pump Housing: Inspection

1. Tip clearance

   Install the oil pump 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 Crest-To-Crest Clearance

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

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

   Side clearance: 

   0.02 - 0.04 mm (0.0008 - 0.0016 in) 

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

   Courtesy of SUBARU OF AMERICA, INC.
3. If the depth and side clearance are out of specification, replace the oil pump rotor assembly.

Inspect the total end play, and adjust it to be within the standard value. <Ref. to ADJUSTMENT  Oil Pump Housing. >