4. Oil Pump

OIL PUMP
Disassembly/Inspection/Assembly





1. Disassemble in the order shown in the figure, referring to Disassembly Note.
2. Assemble in the reverse order of disassembly, referring to ASSEMBLY PROCEDURE.

Disassembly Note
Oil Pump Cover





1. Loosen the mounting bolts evenly in the order shown.
2. Remove the oil pump cover from the oil pump housing.

Inner Rotor, Outer Rotor





Mark the outer and inner rotors without scratching or denting them, and remove them from the oil pump housing.

Inspection
Oil Pump Housing, Outer Rotor, Inner Rotor





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 inch)
Maximum: 0.05 mm (0.0019 inch)

2. If not as specified, replace the pump assembly.





3. Measure the clearance between the oil pump boss and the inner rotor.

Oil clearance
Standard: 0.040 - 0.115 mm (0.0016 - 0.0045 inch)
Maximum: 0.125 mm (0.0049 inch)

4. If not within specification, replace the oil pump assembly.

Spring





1. Measure the spring free length.





Specification

2. If not as specified, replace the spring.

Spool





1. Measure the spool diameter.

Outer diameter
Standard: 13.970 - 13.980 mm (0.5500 - 0.5503 inch)
Minimum: 13.970 mm (0.5500 inch)

2. If not as specified, replace the oil pump assembly.

Assembly Procedure





1. Install a new packing and the oil pipe.

Tightening torque: 16 - 23 Nm (1.6 - 2.4 kgf-m, 12 - 17 ft. lbs.)





2. Apply ATF to the spool.
3. Install the spool and spring into the oil pump housing.
4. Verify that the spool moves smoothly.
5. Install a new packing and the plug.

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





6. Apply ATF to the outer and inner rotors. and oil pump flange.
7. Align the marks and install the outer and inner rotors.
8. Install the oil pump flange.





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

Tightening torque: 8.1 - 10.9 Nm (82 - 112 kgf-cm, 72 - 97 inch lbs.)





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





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

Seal ring inner diameter: 51.45 mm (2.03 inch)





13. Apply petroleum jelly to the bearing race and secure it onto the oil pump cover.

Bearing race outer diameter: 88.0 mm (3.46 inch)