What should the oil pressure be on this Nissan engine?

With SAE 10W-30 oil at 77-83°C (171-181°F), discharge pressure should be 196 kPa (2 kg/cm², 28 psi) at 1,200 rpm, 294 kPa (3 kg/cm², 43 psi) at 2,000 rpm, and 392 kPa (4 kg/cm², 57 psi) at 4,000 rpm, checked with the engine running under no load.

What is the torque spec for the oil pressure switch?

12.3 - 17.2 N·m (1.25 - 1.75 kg-m, 9.0 - 12.7 ft-lb), with sealant applied to the mating surface.

What special tools are used to check oil pressure?

Pressure gauge tools ST25051001 (J25695-1) and ST25052000 (J25695-2).

What precautions apply when removing and installing the oil pump?

Be careful not to drop the oil pump drive shaft when removing. When installing, apply engine oil to the drive gear and shaft. The inner rotor and shaft cannot be disassembled, and a new gasket must always be used.

What are the oil pump fastener torque specs?

Torques shown on the exploded view: 6-7 N·m (0.6-0.7 kg-m, 4.3-5.1 ft-lb), 16-21 N·m (1.6-2.1 kg-m, 12-15 ft-lb), 4-5 N·m (0.4-0.5 kg-m, 2.9-3.6 ft-lb), and 6-8 N·m (0.6-0.8 kg-m, 4.3-5.8 ft-lb).

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Nissan Micra Oil Pressure Check & Oil Pump Removal - Service Manual Page LC-3

Oil pump removal and installation procedure with oil pressure check table

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Oil pump service procedure with exploded pump detail and oil-pressure discharge spec table.

AI caption April 2005 · Photo 93 of 412

This is page LC-3 from a Nissan factory service manual section titled "Engine Lubrication System," covering on-vehicle service (oil pressure check) and oil pump removal and installation. The oil pressure check procedure instructs: warm up the engine, stop it, remove the oil pressure switch (torque spec for reinstallation: 12.3-17.2 N·m / 9.0-12.7 ft-lb, with sealant to the mating surface), install a pressure gauge (special tools ST25051001/J25695-1 and ST25052000/J25695-2), then check pressure under no load. Specified discharge pressures are 196 kPa (28 psi) at 1,200 rpm, 294 kPa (43 psi) at 2,000 rpm, and 392 kPa (57 psi) at 4,000 rpm, tested with SAE 10W-30 oil at 77-83°C (171-181°F). The oil pump section warns not to drop the drive shaft during removal, to oil the drive gear and shaft on installation, notes the inner rotor and shaft cannot be disassembled, and requires a new gasket. An exploded diagram identifies the spring stopper, retainer, drive gear, idler gear, drive shaft, pump body, inner/outer rotors, regulator valve set (valve, spring, pin), gaskets, cover, and oil strainer, with torque specs of 6-7, 16-21, 4-5, and 6-8 N·m for various fasteners.

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Frequently asked questions

What should the oil pressure be on this Nissan engine?: With SAE 10W-30 oil at 77-83°C (171-181°F), discharge pressure should be 196 kPa (2 kg/cm², 28 psi) at 1,200 rpm, 294 kPa (3 kg/cm², 43 psi) at 2,000 rpm, and 392 kPa (4 kg/cm², 57 psi) at 4,000 rpm, checked with the engine running under no load.
What is the torque spec for the oil pressure switch?: 12.3 - 17.2 N·m (1.25 - 1.75 kg-m, 9.0 - 12.7 ft-lb), with sealant applied to the mating surface.
What special tools are used to check oil pressure?: Pressure gauge tools ST25051001 (J25695-1) and ST25052000 (J25695-2).
What precautions apply when removing and installing the oil pump?: Be careful not to drop the oil pump drive shaft when removing. When installing, apply engine oil to the drive gear and shaft. The inner rotor and shaft cannot be disassembled, and a new gasket must always be used.
What are the oil pump fastener torque specs?: Torques shown on the exploded view: 6-7 N·m (0.6-0.7 kg-m, 4.3-5.1 ft-lb), 16-21 N·m (1.6-2.1 kg-m, 12-15 ft-lb), 4-5 N·m (0.4-0.5 kg-m, 2.9-3.6 ft-lb), and 6-8 N·m (0.6-0.8 kg-m, 4.3-5.8 ft-lb).