Disassembly/Assembly

1. Snap ring
2. Rear outer rotor
3. Rear inner rotor
4. Key
5. Screw
6. Body
7. Middle plate
8. Front outer rotor
9. Front inner rotor
10. Key
11. Shaft

OIL PUMP
DISASSEMBLY AND ASSEMBLY
1. Disassemble the parts in the numbered sequence shown in the image.
2. Assemble in the reverse order of disassembly.

Caution
Do not confuse the front and rear rotors.





Assembly Note
Outer rotor and inner rotor
Install the outer and inner rotors at front and rear so that the tally marks on the rotors go toward the front housing.





Screw
Crimp the screw after installing it.





INSPECTION
Oil Pump
1. Inspect the oil pump parts for wear or damage, and replace if necessary.
2. Measure the clearance between the lobes of rotors with a feeler gauge.

Standard clearance:
0.03-0.12 mm (0.0012-0.0047 in)
Clearance limit: 0.15 mm (0.0059 in)





3. Measure the clearance between the outer rotor and the pump body.

Standard clearance:
0.20-0.25 mm (0.0079-0.098 in)
Clearance limit: 0.30 mm (0.0118 in)





4. Inspect the end float of the rotors.

(1) Measure the sinking of the rotor from the pump body.





(2) Measure the sinking of the rotor sliding surface from the pump mounting surface.
(3) Add the two sinking amounts. If necessary, grind the pump body, or replace it.

Standard end float:
0.03-0.13 mm (0.0012-0.0051 in)
End float limit: 0.15 mm (0.0059 in)