Exploded View: Inspection

2. Remove the pump cover.
3. 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): 0.02-0.14 mm (0.001-0.006 in.)

Service Limit: 0.18 mm (0.007 in.)

Fig 1: Checking Clearance Between Inner Rotor And Outer Rotor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. 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): 0.02-0.07 mm (0.001-0.003 in.)

Service Limit: 0.12 mm (0.005 in.)

Fig 2: Checking Clearance Between Rotor And Pump Housing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. 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): 0.100-0.175 mm (0.0039-0.0069 in.)

Service Limit: 0.20 mm (0.008 in.)

Fig 3: Checking Clearance Between Outer Rotor And Pump Housing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Inspect both rotors and the pump housing for scoring or other damage. Replace the damaged parts if necessary.
7. Remove the old oil seal from the oil pump.
8. Use the special tools to install a new oil seal. Drive the seal until the special tool bottoms on the oil pump.

Fig 4: Installing Oil Seal With Special Tools
Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Install the oil pump cover.
Installation
10. Install the cam chain (see CAM CHAIN INSTALLATION ).