Oil Pump Inspection

NOTE: Refer to the Exploded View if needed during this procedure.

Remove the pump housing.

Fig 1: Identifying Pump Housing And Bolts
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Align the tip of the inner rotor tooth (A) with the mark (B) on the outer rotor, then check the inner rotor-to-outer rotor radial clearance between the inner rotor and the outer rotor. If the inner rotor-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.
Inner Rotor-to-Outer Rotor Radial Clearance

Standard (New): 0.05-0.15 mm (0.0020-0.0059 in)

Service Limit: 0.19 mm (0.0075 in)

Fig 2: Checking Inner Rotor-To-Outer Rotor Radial Clearance
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the pump housing-to-rotor axial clearance between the rotor (A) and the pump housing (B). If the pump housing-to-rotor axial clearance exceeds the service limit, replace the oil pump.
Pump Housing-to-Rotor Axial Clearance Standard (New): 0.035-0.070 mm (0.00138-0.00276 in)

Service Limit: 0.12 mm (0.0047 in)

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

Pump Housing-to-Outer Rotor Radial Clearance

Standard (New): 0.15-0.21 mm (0.0059-0.0083 in)

Service Limit: 0.23 mm (0.0091 in)

Fig 4: Checking Pump Housing-To-Outer Rotor Radial Clearance

Courtesy of AMERICAN HONDA MOTOR CO., INC.