Oil Pump Clearance Inspection

Inspection





1. Measure the radial clearance between the inner rotor (A) and the outer rotor (B). If the clearance exceeds the service limit, replace the pump rotor.
Inner Rotor-to-Outer Radial Clearance
Standard: 0.14 mm (0.006 inch) maximum
Service Limit: 0.20 mm (0.008 inch)





2. Measure the radial clearance between the outer rotor (B) and the transmission housing (C). If the clearance exceeds the service limit, replace the pump rotor.
Rotor-to-Transmission Housing Radial Clearance
Standard: 0.1 - 0.2 mm (0.004 - 0.008 inch)
Service Limit: 0.22 mm (0.009 inch)
3. Measure the axial clearance on the pump rotor. If the clearance exceeds the standard, select the appropriate rotor for the correct clearance from the chart.
Rotor-to-Transmission Housing Axial Clearance
Standard: 0.03 - 0.07 mm (0.001 - 0.003 inch)





Outer and Inner Rotor Set