Oil Pump Cleaning and Inspection
- Disassemble the oil pump. Refer to Oil Pump Disassemble .
- 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.
Specification:
- Oil pump inner rotor-to-outer rotor radial clearance - new: 0.04-0.16 mm (0.002-0.0063 in)
- Oil pump inner rotor-to-outer rotor radial clearance - service limit: 0.2 mm (0.008 in)
- 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.
Specification:
- Housing-to-rotor axial clearance - new: 0.02-0.07 mm (0.001-0.003 in)
- Housing-to-rotor axial clearance - service limit: 0.12 mm (0.005 in)
- 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.
Specification:
- Housing-to-outer rotor radial clearance - new: 0.10-0.19 mm (0.004-0.007 in)
- Housing-to-outer rotor radial clearance - service limit: 0.2 mm (0.008 in)
- Inspect both rotors (432 and 433) for scoring or other damage.
- Inspect the valve (420) and valve bore for scoring or other damage. The valve must move freely in the bore.
- Inspect for a collapsed or broken spring (421).
- Inspect the sealing surfaces for damage.
- Inspect the oil passages for debris or restrictions.
- Assemble the oil pump. Refer to Oil Pump Assemble .