Checking the pressure reducing valve
1. At high speeds, the amount of oil supplied by the oil pump is excessive compared to the amount needed to lubricate the rubbing pairs. The pressure reducing valve prevents excess oil supply. At low speeds, the pressure reducing valve closes the bypass channel under the action of a spring. At high speeds, oil pressure increases, the oil pressure force overcomes the spring force, the pressure reducing valve opens, and excess oil returns to the sump through the bypass channel.
2. Use a wooden rod to press the valve plug and check that the plug moves to its original position without binding. If a sticky valve plug is found, replace the valve.
Checking the engine oil emergency pressure sensor
1. Check engine oil level.
2. Disconnect the engine oil emergency pressure sensor connector.
Engine 4G15.
Engine 4G93.
3. Using a special key, remove the sensor.
Attention: sealant is applied to the threads of the engine oil emergency pressure sensor, be careful not to damage the sensor when removing it.
4. Connect the measuring device through the adapter (manometer).
5. Start the engine and let it idle (warming up).
6. After warming up the engine, check that the oil pressure is at the nominal value.
Rated value:
- Idling - 29 kPa or more
- 3500 rpm - 294 - 686 kPa
7. Disconnect the meter (manometer).
8. Apply sealant to the threads of the emergency engine oil pressure switch.
Sealant Three Bond 1215 or equivalent
Caution: Be careful when applying sealant so that it does not block the oil passage.
b) Install and tighten the sensor to the specified torque.
Torque:
- Engine 4G15 - 16 - 22 N.m
- Engine 4G93 - 8-12 N.m
Attention: after installing the emergency oil pressure switch, wait at least an hour before starting the engine.
9. Connect a socket of the gauge of emergency pressure of engine oil.