Disassembly and Assembly

POWER STEERING OIL PUMP


Disassembly and Assembly (Models with VQ35HR)


COMPONENTS











INSPECTION BEFORE DISASSEMBLY
Disassemble oil pump only when the following malfunctions occur.
- If oil leakage is found on oil pump.
- Oil pump pulley is damaged or deformed.
- Performance of oil pump is low.

DISASSEMBLY
1. Remove rear cover mounting bolts, and then remove rear cover from body assembly.

CAUTION:
- Fix oil pump with a vise if necessary.
- Use copper plates when fixing with a vise.
2. Remove O-ring from body assembly.
3. Remove rear side plate from cartridge, and then remove Teflon ring and O-ring from rear side plate.





4. Remove rotor snap ring using a snap ring pliers, and remove pulley from body assembly.

CAUTION:
Remove pulley so as not to be damaged when removing rotor snap ring.
5. Remove cartridge and front side plate.





6. Remove flow control valve A (1), flow control valve spring (2) and flow control valve B assembly (3) from body assembly (4).

CAUTION:
Never drop and damage flow control valve A and flow control valve B assembly when removing.
7. Remove oil seal from body assembly.
8. Remove mounting bolt of suction pipe, and then remove suction pipe from body assembly.
9. Remove O-ring from body assembly.
10. Remove bracket mounting bolts, and then remove bracket from body assembly.

INSPECTION AFTER DISASSEMBLY

Body Assembly and Rear Cover Inspection
Check body assembly and rear cover for internal damage. Replace rear cover if it is damaged. Replace oil pump assembly if body assembly is damaged.

Cartridge Assembly Inspection
Check cam ring, rotor and vane for damage. Replace cartridge assembly if there are.

Side Plate Inspection
Check side plates (front and rear) for damage. Side plates (front and rear) must be replaced as a set if they are damaged.

Flow Control Valve Inspection
Check flow control valve A, flow control valve spring and flow control valve B assembly for damage. Replace if there are.

ASSEMBLY





1. Apply recommended grease to oil seal lips. Apply recommended fluid to around oil seal, and then install oil seal to body assembly using a drift [SST].

CAUTION:
- Fix oil pump with a vise if necessary.
- Use copper plates when fixing with a vise.
2. Install bracket to body assembly.
3. If dowel pin has been removed, insert it into body assembly by hand. If it cannot be inserted by hand, lightly tap with a hammer.





4. Install flow control valve A (1), flow control valve spring (2) and flow control valve B assembly (3) to body assembly (4).





5. Install front side plate (3) with dowel pin (2) on flow control valve
A (1) side as shown in the figure aligning with front side plate cutout (A) to body assembly (4).





6. Install cam ring as shown in the figure.
7. Install pulley to body assembly.

CAUTION:
Never damage oil seal when installing pulley.





8. Install rotor so that mark faces body assembly, and then install it to pulley shaft.





9. Install vane to rotor so that arc of vane faces cam ring side.





10. Install rotor snap ring to slit of pulley shaft using a hammer and a
10 mm (0.39 in) box.

CAUTION:
- Never damage rotor and pulley shaft.
- Oil pump assembly must be replaced if rotor is damaged.





11. Install rear side plate with dowel pin A on flow control valve A side as shown in the figure aligning with rear side plate cutout B to cartridge.
12. Apply recommended fluid to O-ring, and then install O-ring to body assembly.
13. Apply recommended fluid to O-ring, and then install O-ring to rear side plate.
14. Apply recommended fluid to Teflon ring, and then install Teflon ring to rear side plate.
15. Install rear cover to body assembly.
16. Apply recommended fluid to O-ring, and then install O-ring to body assembly.
17. Install suction pipe to body assembly.