Oil Pump Inspection

Remove the pump housing.

Fig 1: Identifying Pump Housing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the inner-to-outer rotor radial clearance between the inner rotor (A) and outer rotor (B). If the inner-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.
Inner Rotor-to-Outer Rotor Radial Clearance

Standard (New): 0.06-0.16 mm (0.002-0.006 in.)

Service Limit: 0.20 mm (0.008 in.)

Fig 2: Identifying Inner Rotor & Outer Rotor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the housing-to-rotor axial clearance between the rotor (A) and pump housing (B). If the housing-to-rotor axial clearance exceeds the service limit, replace the oil pump.
Housing-to-Rotor Axial Clearance

Standard (New): 0.035-0.070 mm (0.0014-0.0028 in.)

Service Limit: 0.12 mm (0.005 in.)

Fig 3: Identifying Rotor & Pump Housing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the housing-to-outer rotor radial clearance between the outer rotor (A) and pump housing (B). If the housing-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.
Housing-to-Outer Rotor Radial Clearance

Standard (New): 0.15-0.21 mm (0.006-0.008 in.)

Service Limit: 0.23 mm (0.009 in.)

Fig 4: Identifying Outer Rotor & Pump Housing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect both rotors and the pump housing for scoring or other damage. Replace the parts if necessary.