Infiniti FX35, FX50 (S51). Manual - part 1762

ST-40

< REMOVAL AND INSTALLATION >

POWER STEERING OIL PUMP

16. Apply recommended fluid to O-ring, and then install O-ring to body assembly.

17. Install suction pipe to body assembly.

VQ35HR : Inspection

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RELIEF OIL PRESSURE

CAUTION:

Make sure that belt tension is normal before starting the following procedure.
1.

Connect the oil pressure gauge [SST: KV48103500 (J-26357)]
and the oil pressure gauge adapter [SST: KV48102500 (J-
33914)] between oil pump discharge connector and high-pres-
sure hose. Bleed air from the hydraulic circuit while opening
valve fully. Refer to 

ST-12, "Inspection"

.

2.

Start engine. Run engine until oil temperature reaches 50 to
80

°

C (122 to 176

°

F).

CAUTION:

• Leave the valve of the oil pressure gauge fully open while

starting and running engine. If engine is started with the
valve closed, the hydraulic pressure in oil pump goes up
to the relief pressure along with unusual increase of oil
temperature.

• Be sure to keep hose clear of belts and other parts when

engine is started.

3.

Fully close the oil pressure gauge valve with engine at idle and
measure the relief oil pressure.

CAUTION:

Never keep valve closed for 10 seconds or longer.

4.

Open the valve slowly after measuring. Repair oil pump if the relief oil pressure is outside the standard.
Refer to 

ST-37, "VQ35HR : Disassembly and Assembly"

.

5.

Disconnect the oil pressure gauge from hydraulic circuit.

6.

When installing eye bolt (1) and copper washer (2) to oil pump
(3), refer to the figure.

CAUTION:

• Never reuse copper washers.
• Apply power steering fluid or equivalent to around copper

washer, then install eye bolt.

• Install eye bolt with eye joint (assembled to high pressure

hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specified torque after tightening by
hand. Refer to 

ST-48, "VQ35HR : Exploded View"

(VQ35HR), 

ST-49, "VK50VE : Exploded View"

 (VK50VE).

• Securely insert harness connector to pressure sensor.

7.

Check fluid level, fluid leakage and air bleeding hydraulic system after the installation. Refer to 

ST-12,

"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. 

AFTER DISASSEMBLY

Body Assembly and Rear Cover Inspection

Standard

Relief oil pressure

: Refer to 

ST-51, "Relief Oil 

Pressure"

.

SGIA0915E

JSGIA0452ZZ

POWER STEERING OIL PUMP

ST-41

< REMOVAL AND INSTALLATION >

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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 necessary.

Side Plate Inspection

Check side plate for damage. Replace side plate if there are.

Flow Control Valve Inspection

Check flow control valve and spring for damage. Replace if necessary.

VK50VE

VK50VE : Exploded View

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REMOVAL 

DISASSEMBLY 

1.

Power steering oil pump

2.

Bracket

: Vehicle front

Refer to 

GI-4, "Components"

 for symbols in the figure.

JSGIA0411GB

ST-42

< REMOVAL AND INSTALLATION >

POWER STEERING OIL PUMP

VK50VE : Removal and Installation

INFOID:0000000005235291

REMOVAL

1.

Drain power steering fluid from reservoir tank.

2.

Remove the floor under cover from vehicle. Refer to 

EXT-31, "Exploded View"

.

3.

Loosen drive belt. Refer to 

EM-163, "Exploded View"

.

4.

Remove drive belt from oil pump pulley.

5.

Remove pressure sensor connector.

6.

Remove joint mounting nut.

7.

Remove suction hose (drain fluid from their pipings).

8.

Remove oil pump mounting bolts, and then remove oil pump.

INSTALLATION

Note the following, and install in the reverse order of removal.

1.

Pulley

2.

Snap ring

3.

Drive shaft

4.

Joint

5.

O-ring 6.

Connector 

bolt 

7.

Flow control valve

8.

Spring

9.

Oil seal

10. Suction pipe

11.

O-ring

12. Body assembly

13. O-ring

14. Side plate

15. Vane 

16. Rotor

17. Cam ring

18. Cartridge

19. Dowel pin

20. Gasket

21. Rear cover

22. Copper washer

: Apply power steering fluid.

: Apply multi-purpose grease.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

SGIA1187E

POWER STEERING OIL PUMP

ST-43

< REMOVAL AND INSTALLATION >

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• When installing suction hoses (1), refer to the figure.

CAUTION:

• Never apply fluid to the hose (1) and tube (2).
• Insert hose securely until it contacts spool (A) of tube.
• Leave clearance (L) when installing clamp (3).

• When installing eye bolt (1) and copper washer (2) to oil pump (3),

refer to the figure.

CAUTION:

• Never reuse copper washer.
• Apply power steering fluid to around copper washers, then

install eye bolt.

• Install eye bolt with eye joint (assembled to high pressure

hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specified torque after tightening by
hand. Refer to 

ST-49, "VK50VE : Exploded View"

.

• Securely insert harness connector to pressure sensor.

• About the installation of drive belt. Refer to 

EM-164,

"Tension Adjustment"

.

• Check fluid level, fluid leakage and air bleeding hydraulic system after the installation. Refer to 

ST-12,

"Inspection"

.

VK50VE : Disassembly and Assembly

INFOID:0000000005235292

DISASSEMBLY

NOTE:
Secure oil pump in a vise if necessary.

CAUTION:

Use copper plates when securing in a vise.

1.

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

2.

Remove gasket from body assembly.

3.

Remove dowel pin, cartridge and side plate from body assembly.

4.

Remove pulley mounting nut and washer, then remove pulley from drive shaft.

5.

Remove snap ring from drive shaft and press out it.

CAUTION:

When removing snap ring, be careful not to damage drive
shaft.

Standard

L

: 3 – 8 mm (0.12 – 0.31 in)

JSGIA0118ZZ

JSGIA0452ZZ

SST010B