RELIEF OIL PRESSURE ■ CAUTION ■ Check 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-pressure hose. Bleed air from the hydraulic circuit while opening valve fully. Refer to 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.
- Always 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.

Relief oil pressure | : Refer to Relief Oil Pressure (GT-R certified NISSAN dealer).

■ CAUTION ■
Never keep valve fully 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 Disassembly and Assembly (GT-R certified NISSAN dealer).

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 Exploded View.
- Securely insert harness connector to pressure sensor.

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