Fluid Pump: Service and Repair

DISASSEMBLY
1. Disassemble in the order shown in the illustration, referring to the following notes.





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. Standard clearance is 0.02 - 0.04 mm (0.0008 - 0.0015 inch) and the maximum is 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 is 0.040 - 0.115 mm (0.0016 - 0.0045 inch) and the maximum is 0.125 mm (0.0049 inch).
4. If not within the specification, replace the oil pump assembly.








Spring
1. Measure the spring free length.
2. If not as specified, replace the spring.





Spool
1. Measure the spool diameter. Standard outer diameter is 13.970 - 13.980 mm (0.5500 - 0.5503 inch) and the minimum is 13.970 mm (0.5500 inch).
2. If not as specified, replace the oil pump assembly.

ASSEMBLY
- Assemble in the reverse order of disassembly, referring to following steps:





1. Install a new packing and the oil pipe. Tighten to 16 - 23 Nm (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. Tighten to 32 - 47 Nm (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 to 8.1 - 10.9 Nm (72 - 97 inch lbs.).





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





12. Apply petroleum to the new seal rings and install them onto the oil pump cover. Seal ring inner diameter is 55.9 mm (2.20 inch).





13. Apply petroleum jelly to the bearing race and secure it onto the oil pump cover. Bearing race outer diameter is 88.0 mm (3.46 inch).