50. Oil Pump Clean and Inspect

Oil Pump Cleaning and Inspection





1. Disassemble the oil pump.
2. Measure the inner-to-outer rotor radial clearance. Use a feeler gage to measure between the inner rotor (432) and the outer rotor (433). If the clearance exceeds the service limit, replace the oil pump assembly.
^ Oil pump inner rotor-to-outer rotor radial clearance - new: 0.04 - 0.16 mm (0.002 - 0.0063 inch)
^ Oil pump inner rotor-to-outer rotor radial clearance - service limit: 0.2 mm (0.008 inch)





3. Measure the housing-to-rotor axial clearance. Use a feeler gage and a straight edge to measure between both rotors (1) and the straight edge.If the clearance exceeds the service limit, replace the oil pump assembly.
^ Housing-to-rotor axial clearance - new: 0.02 - 0.07 mm (0.001 - 0.003 inch)
^ Housing-to-rotor axial clearance - service limit: 0.12 mm (0.005 inch)





4. Measure the housing-to-outer rotor radial clearance. Use a feeler gage to measure between the outer rotor (433) and the pump housing (424).If the clearance exceeds the service limit, replace the oil pump assembly.
^ Housing-to-outer rotor radial clearance - new: 0.10 - 0.19 mm (0.004 - 0.007 inch)
^ Housing-to-outer rotor radial clearance - service limit: 0.2 mm (0.008 inch)





5. Inspect both rotors (432 and 433) for scoring or other damage.
6. Inspect the valve (420) and valve bore for scoring or other damage. The valve must move freely in the bore.
7. Inspect for a collapsed or broken spring (421).
8. Inspect the sealing surfaces for damage.
9. Inspect the oil passages for debris or restrictions.
10. Assemble the oil pump.