Variable Flow Oil Pump With Integral Vacuum Pump
| ITEM | DESCRIPTION |
|---|---|
| 1 | Vacuum exhaust valve |
| 2 | Engine oil outlet to cylinder block |
| 3 | Center plate |
| 4 | Oil pressure control solenoid |
| 5 | Control ring |
| 6 | Vanes and rotor assembly |
| 7 | Oil pump cover |
| 8 | Oil pump inlet pipe |
| 9 | Control spring |
| 10 | Oil pump housing |
| 11 | Vacuum port connection to cylinder block |
| 12 | Vacuum pump vanes |
| 13 | Vacuum pump housing |
| 14 | Oil pump drive sprocket |
| 15 | Bolt |
| 16 | Control ring oil pressure surface |
| 17 | Oil pump rotor |
| 18 | Oil pump vane (quantity 7) |
The variable flow oil pump with integral vacuum pump is attached to the cylinder block with 4 bolts. The input shaft of the variable flow oil pump with integral vacuum pump is equipped with a sprocket and is driven from the front of the crankshaft. The sprocket is driven by an auxiliary chain, at 0.84 times engine speed.
Variable Flow Oil Pump
The variable flow oil pump draws oil from the oil pan through a centrally mounted inlet pipe. The oil is pressurized and pumped through a bore in the cylinder block. After passing through an anti drain valve and an oil cooler, the oil is filtered by a replaceable oil filter element. The oil filter element is installed in the oil filter housing.
The variable flow oil pump is a vane cell pump with an eccentrically mounted control ring. The variable flow oil pump has a volumetric flow control mechanism to reduce the required drive output. The flow delivery can be adjusted using the control ring. Applying oil pressure to the control ring allows it to be adjusted against the force of an opposing control spring.
The engine oil pressure is fed back to the variable flow oil pump through a drilling in the cylinder block. The variable flow oil pump uses this pressure signal to regulate the oil flow and pressure. The PCM can control the variable flow oil pump electrically, requesting a pressure held in the engine oil pressure map.
The eccentricity of the control ring can be decreased or increased, with increasing eccentricity increasing the output flow. The output of the variable flow oil pump is adjusted appropriate to engine load and speed to reduce load on the engine. An oil pressure control solenoid adjusts the oil pressure to the control ring to adjust the output flow. The oil pressure control solenoid is operated with a PWM signal from the PCM .
Vacuum Pump
The vacuum pump is tandem to the oil pump, connected to the vacuum harness through a drilling in the cylinder block and a vacuum connector. The vacuum produced by the vacuum pump is used to provide a vacuum for the active engine mounts.
The vacuum pump extracts air through a vacuum pipe from the active engine mounts and a port in the cylinder block. The extracted air flows through the vacuum pipe connector which is equipped with a 1-way valve. The 1-way valve prevents oil ingress into the active engine mount system. The air is vented into the cylinder block through a vacuum exhaust valve.