Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Lubrication System
Continuous Variable Displacement Oil Pump
The variable displacement oil pump is designed to have the ability to change its running displacement upon command. Working together with a pressure regulation proportional solenoid valve, it can vary its displacement to produce the required oil pressure without wasting energy through bypassed oil flow or excessively high oil pressure. Therefore, its power consumption is reduced for a better fuel economy, comparing to a fixed displacement oil pump.
The oil pressure in the control chamber is balanced by the force from the pump spring in a running pump. When a given duty cycle control signal is sent to the solenoid valve, it will command a given oil pressure. If the actual oil pressure is higher than the commanded oil pressure, the solenoid valve will supply more oil to the control chamber, produce more pressure in the chamber, push the spring and the eccentric ring down, and reduce its running displacement and the oil pressure till the pressure is at the commanded level. Or vice versa, if the actual oil pressure is lower than the commanded oil pressure, the solenoid valve will supply less oil to the control chamber or even vent the chamber, produce less pressure in the chamber, bring the spring and the eccentric ring up, and increase its running displacement and the oil pressure till the pressure is at the commanded level.
The required oil pressure, i.e. the commanded oil pressure, depends on the operation conditions of the engine. Therefore, the engine runs with oil pressure at its required level without waste in such a system in order to minimize its parasitic energy loss
Continuous Variable Displacement Oil Pump
| Item | Description |
|---|---|
| 1 | Pump control chamber |
| 2 | Pump-Out |
| 3 | Oil filter and cooler adapter flow resistance |
| 4 | Oil gallery |
| 5 | Engine oil flow resistance |
| 6 | Solenoid valve |
| 7 | A port - connect to pump control chamber |
| 8 | T port - tank/vent port, vent to crankcase |
| 9 | P port - control pressure, connect to main oil gallery |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.