Oil Pump Housing: 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

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
Courtesy of SUBARU OF AMERICA, INC.
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
Courtesy of SUBARU OF AMERICA, INC.

If depth and/or side clearances are outside specifications, replace rotor assembly.

OIL PUMP ROTOR THICKNESS SPECIFICATION

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 to within specifications. < Ref. to , ADJUSTMENT , Oil Pump Housing. >