Vacuum Pump (2.7L Diesel)
| Item Number | Description |
|---|---|
| 1 | Vacuum connection (not used) |
| 2 | Vacuum connection for brake booster |
| 3 | Drive dog |
| 4 | Seal |
| 5 | Oil inlet port |
| 6 | Oil return/air vent |
A vacuum pump is installed on diesel models as the air inlet system does not produce sufficient vacuum for satisfactory operation of the brake booster.
The vacuum pump is a radial vane pump which is attached to the rear of the RH cylinder head and driven at half engine speed by the exhaust camshaft. The vacuum pipe from the brake booster connects to an elbow on the rim of the vacuum pump.
The vacuum pump is lubricated and cooled by engine oil supplied to a port in the front face of the vacuum pump from a gallery in the cylinder head. The oil return is through a vent in the front face of the pump into a drain cavity in the cylinder head. Air extracted from the brake booster is vented into the drain cavity with the returning engine oil.