Case Clearance

Measure the clearance between outer rotor and oil pump case. If clearance is out of standard, replace the oil pump case.

Case clearance between outer rotor and pump case: 

Standard 

0.10 - 0.175 mm (0.0039 - 0.0069 in) 

Fig 1: Measuring Case Clearance Between Outer Rotor And Pump Case

Courtesy of SUBARU OF AMERICA, INC.