OIL PUMP [SKYACTIV-G 1.3]SM2759827
OIL PUMP [SKYACTIV-G 1.3]

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Purpose, Function

• The oil pump suctions the engine oil in the oil pan through the oil strainer and pumps engine oil into the engine.

Construction

• The oil pump is located under the cylinder block (inside the oil pan).
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• With the adoption of the chain drive type oil pump, the diameter of the rotor is reduced. As a result, the oil pump drive resistance has been reduced.
• The oil pump consists of the following parts:
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• The oil pump has a relief valve which suppresses oil pressure increase of more than the set pressure and reduces oil pump drive resistance.
• When the relief valve is pushed and opened, engine oil flows. As a result, the oil pressure decreases and the oil pump drive resistance is reduced.
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Operation

• The oil pump adjusts oil pressure in two steps (low oil pressure setting, high oil pressure setting) by switching the oil passage with the operation of the engine oil solenoid valve. For the operation condition of the engine oil solenoid valve, refer to CONTROL SYSTEM. (See ENGINE OIL CONTROL [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
Engine oil flow when setting low oil pressure (engine oil solenoid valve ON)
a. When the engine oil solenoid valve is turned ON, oil pressure is also applied to the upper part of the pilot valve. Because the oil pressure applied to the upper and lower parts of the pilot valve is almost the same, the pilot valve is pressed up by the spring force.
b. Oil pressure is applied to the upper part of the relief valve.
c. When the oil pressure exceeds the relief valve opening pressure, the relief valve is pressed down and engine oil flows (oil pressure decrease).
d. When the oil pressure is less than the relief valve opening pressure, the relief valve closes. As a result, engine oil flow stops (oil pressure increase).
e. Oil pressure is adjusted by repeating Step (c) to (d).
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Engine oil flow when setting high oil pressure (engine oil solenoid valve OFF)
a. When oil pressure exceeds the pilot valve opening pressure, the pilot valve is pressed up and oil pressure is applied to the upper part of the relief valve.
b. Because the relief valve opening pressure is exceeded by applying oil pressure to the upper part of the relief valve, the relief valve is pressed down and engine oil flows (oil pressure decrease).
c. When the oil pressure is less than the pilot valve opening pressure, the pilot valve closes. As a result, the relief valve closes and engine oil flow stops (oil pressure increase).
d. Oil pressure is adjusted by repeating Step (b) to (c).
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