Oil Pump Housing: Inspection

Check the seal ring and oil seal for breaks and damage.
Check other parts for dents or faults.

Oil pump rotor assembly selection

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 Tip Clearance
Courtesy of SUBARU OF AMERICA, INC.
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.

If the depth and/or side clearance are not within the specification, replace the oil pump rotor assembly.

OIL PUMP ROTOR THICKNESS SPECIFICATIONS

Oil pump rotor assembly
Part No.	Thickness mm (in)
15008AA060	11.37 - 11.38 (0.4476 - 0.4480)
15008AA070	11.38 - 11.39 (0.4480 - 0.4484)
15008AA080	11.39 - 11.40 (0.4484 - 0.4488)

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