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 (7 off) |
The variable flow oil pump with integral vacuum pump is attached to the cylinder block with four bolts. The input shaft of the variable flow oil pump with integral vacuum pump is fitted 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 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 by a Pulse Width Modulation (PWM) signal from the Powertrain Control Module (PCM).
Vacuum Pump
The vacuum pump is tandem to the oil pump, connected to the vacuum harness via a drilling in the engine block and a vacuum connector. The vacuum produced by the vacuum pump is used to provide a vacuum for the brake booster on the braking system.
The vacuum pump extracts air from the brake booster through a vacuum pipe from the brake booster and a port in the cylinder block. The air extracted from the brake booster flows through the vacuum pipe connector which is equipped with a one way valve. The one way valve prevents oil ingress into the brake system. The air is vented into the cylinder block via a vacuum exhaust valve.