Oil Pump Disassembly/Assembly

OIL PUMP DISASSEMBLY/ASSEMBLY
1. Disassemble in the order indicated in the table.
2. Assemble in the reverse order of disassembly indicated in the table.





Oil pump cover disassembly note
^ Loosen the mounting bolts evenly in the pattern shown and remove the oil pump cover from the oil pump housing.





Inner rotor, outer rotor disassembly note
^ Mark the outer and inner rotors without scratching or denting them, than remove them from the oil pump housing.





Assembly procedure
1. Measure the clearance between the end of the oil pump housing and the outer rotor and inner rotor at four places along their circumferences.

Clearance
Standard:
0.02 - 0.04 mm (0.0008 - 0.0015 in)
Maximum:
0.05 mm (0.0019 in)





2. If not as specified, replace the oil pump.
3. Measure the clearance between the oil pump boss and the inner rotor.





4. If not within the specification, replace the oil pump.
5. Measure the spring free length.





6. If not as specified, replace the oil pump.
7. Measure the spool and check for wear.





8. If not as specified, replace the oil pump.
9. Apply ATF to the spool.
10. Install the spool and spring into the oil pump housing.
11. Verify that the spool moves smoothly.
12. Install a new packing and the plug.

Tightening torque
32 - 47 Nm (3.2 - 4.8 kgf-m, 24 - 34 ft-lbf)

13. Apply ATF to the outer and inner rotors and oil pump flange.
14. Align the marks and install the outer and inner rotors.
15. Install the oil pump flange.





16. Mount the oil pump cover onto the oil pump housing.
17. Tighten the bolts evenly and gradually in the order shown.

Tightening torque
8.1-10.9 Nm (82 - 112 kgf-cm, 72 - 974 in-lbf)





18. Install the oil pump shaft and verify smooth oil pump operation.

Caution
^ Carefully install the seal rings without damaging them. If they are cut or scratched during installation, oil leakage will occur.

19. Apply ATF to new seal rings and install them onto the oil pump cover.

Seal ring inner diameter
39.45 mm (1.553 in)