Visual Inspection

Check outer rotor (3), inner rotor and oil pump cases (1), (2) for excessive wear or damage.
If abnormal condition is found in above checks, replace oil pump assembly.
Check relief valve (4) for excessive wear or damage.
If abnormal condition is found in above checks, replace oil pump relief valve set.

Fig 1: Identifying Outer Rotor, Inner Rotor And Oil Pump Cases
Courtesy of SUZUKI OF AMERICA CORP.