Disassembly/Assembly

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

DISASSEMBLY
Disassemble in the order shown in the image.

Caution
Do not interchange front and rear rotors when assembling.





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

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





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

Standard clearance:
0.20-O.25mm (0.0079-0.098 In)
Clearance limit: 0.30mm (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:
0.03-0.125mm (0.0012-0.0049 in)
End float limit: 0.15mm (0.0059 in)





Assembly
Assemble in the reverse order of disassembly, referring to Assembly Note.

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
Stake the screw after installing It.