What should the oil pressure be at various engine speeds?

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.

At what temperature does the thermostat open?

The thermostat valve opening temperature is 88°C (190°F), with a maximum valve lift of 8 mm at 100°C (0.31 in at 212°F).

What is the radiator cap relief pressure?

The cap relief pressure is 88 kPa (0.9 kg/cm², 13 psi), and the leakage test pressure is 157 kPa (1.6, 23 psi).

What is the torque spec for the oil pump securing bolt?

16 - 22 N·m (1.6 - 2.2 kg-m, 12 - 16 ft-lb).

When does the water temperature switch operate?

The water temperature switch operates (OFF → ON) at 90°C (194°F).

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Nissan Micra Engine Lubrication & Cooling Specs - Oil Pressure, Torque (LC-9)

Nissan SDS EM-39 engine lubrication and cooling system specs oil pressure radiator thermostat

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Engine lubrication and cooling SDS page: oil discharge pressure by rpm, oil pump clearances, radiator cap relief 88 kPa, thermostat opens 88C, and water-temperature-switch operating temp 90C.

AI caption April 2005 · Photo 99 of 412

This is a Service Data and Specifications (S.D.S.) page from a factory service manual, covering the Engine Lubrication System and Engine Cooling System, uploaded for a 1990 Nissan Micra. The lubrication section lists oil pressure check values at three engine speeds (196 kPa at 1,200 rpm, 294 kPa at 2,000 rpm, 392 kPa at 4,000 rpm), oil pump unit clearances (rotor tip, outer rotor to body, and rotor to straight edge, all less than 0.2–0.25 mm), and tightening torques for the oil pump securing bolt, oil pump cover bolt (M6), oil pump gear spring securing bolt, oil strainer nut, and oil pressure switch in N·m, kg-m, and ft-lb. The cooling section gives radiator cap relief pressure (88 kPa / 13 psi), leakage test pressure (157 kPa / 23 psi), thermostat valve opening temperature (88°C / 190°F), maximum valve lift (8 mm/100°C), water temperature switch operating temperature (90°C / 194°F), and tightening torques for the water pump securing bolt, water outlet securing bolt, radiator securing bolt, and water temperature switch. The page is marked LC-9 at the bottom, indicating the Lubrication & Cooling section of the manual.

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Frequently asked questions

What should the oil pressure be at various engine speeds?: 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.
At what temperature does the thermostat open?: The thermostat valve opening temperature is 88°C (190°F), with a maximum valve lift of 8 mm at 100°C (0.31 in at 212°F).
What is the radiator cap relief pressure?: The cap relief pressure is 88 kPa (0.9 kg/cm², 13 psi), and the leakage test pressure is 157 kPa (1.6, 23 psi).
What is the torque spec for the oil pump securing bolt?: 16 - 22 N·m (1.6 - 2.2 kg-m, 12 - 16 ft-lb).
When does the water temperature switch operate?: The water temperature switch operates (OFF → ON) at 90°C (194°F).