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 / ASSEMBLY
1. Disassemble in the order shown in the image.
2. Assemble in the reverse order of disassembly, referring to Assembly Note.





INSPECTION
1. Inspect the oil pump parts for wear and damage. Replace as necessary.
2. Measure the clearance between the lobes of rotors by using a feeler gauge.

Standard clearance:
0.03-0.12 mm (0.0012-0.0047 in)
Maximum: 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)
Maximum: 0.30 mm (0.0118 in)





4. Inspect the side clearance of the rotors.

(1) Using a straightedge and a feeler gauge, measure the depth of the rotor in the pump body.





(2) Measure the depth of the rotor sliding surface from the pump mounting surface.
(3) Add these two depth to obtain the side clearance.
(4) If not as specified, grind or replace the pump body.

Standard end clearance:
0.03-0.125 mm (0.0012-0.0049 in)
Maximum: 0.15 mm (0.0059 in)

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





Screw
To prevent the screw from loosening, stake it after installation.