Electric Variable Oil Pump
| ITEM | DESCRIPTION |
|---|---|
| 1 | Pressurized oil outlet to cylinder block |
| 2 | Pump pressure outlet |
| 3 | Pump inlet |
| 4 | Electric variable oil pump |
| 5 | Oil pump electrical connection |
| 6 | Oil pump drive sprocket |
| 7 | Oil pick-up pipe |
The electric variable oil pump is attached to the underside of the windage tray with 3 bolts. A solenoid valve in the pump switches to reduce the oil gallery control pressure at lower engine speeds, thus saving power consumption of the pump and reducing overall fuel consumption. The pump is controlled by the Powertrain Contol Module (PCM).
For additional information, refer to: Electronic Engine Controls - DESCRIPTION AND OPERATION .
The input shaft of the oil pump is driven from the front of the crankshaft, by the auxiliary chain, at 0.87 engine speed. The oil pump draws oil from the oil pan through a centrally mounted pick-up pipe. The oil is pressurized and pumped through an output tube to the cylinder block. After passing through an anti-drain valve and a plate type oil cooler, the oil is filtered by a replaceable cartridge installed on the front of the right (Bank 1) cylinder head.
The output from the oil filter is distributed through oil galleries in the cylinder heads and the cylinder block. All moving parts are lubricated by pressure or splash oil. Pressurized oil is also provided for the VCT system, the piston cooling jets and the timing chain lubrication jets.
The oil returns to the oil pan under gravity. Large drain holes through the cylinder heads and cylinder block ensure the rapid return of the oil to the oil pan. System replenishment is through the oil filler cap on the left cylinder head cover.
An oil evacuation tube is installed to allow oil to be drawn from the oil pan. The upper end of the oil evacuation tube is located under the oil filler cap. An oil drain plug is installed in the right side of the oil pan.