Engine - INGENIUM I4 2.0L Petrol (G2313267): Description: Camshafts
| ITEM | DESCRIPTION |
|---|---|
| 1 | Intake camshaft lobe (quantity 4) |
| 2 | Reluctor ring - Camshaft Position (CMP) sensor (quantity 2) |
| 3 | Exhaust camshaft lobe (quantity 8) |
| 4 | Lobe - High Pressure (HP) fuel pump |
| 5 | Needle roller bearings |
| 6 | Exhaust camshaft |
| 7 | Intake camshaft |
The engine is installed with a Double Over Head Camshaft (DOHC) configuration which uses 2 camshafts:
- Intake camshaft
- Exhaust camshaft.
The exhaust camshaft lobes control the opening and closing of the exhaust valves through the roller finger cam followers. The exhaust camshaft has a camshaft lobe that drives the High Pressure (HP) fuel pump.
The intake camshaft lobes control the opening and closing angles with the Continuously Variable Valve Lift (CVVL) assembly.
The camshafts run on needle roller bearings to reduce friction and minimize the breakaway torque on engine startup. The needle roller bearings are housed in the camshaft carrier and the camshaft caps are marked with 'I' for intake and 'E' for exhaust. The camshaft caps are also numbered to make sure assembly in the correct position in the camshaft carrier. For example, 'I4' or 'E1'.
The camshafts are of a hollow steel tube construction, with pressed on forged lobes and needle roller bearings. The hollow tube design provides reduced weight for increased engine performance. Each camshaft has a pressed on drive adapter which locates a drive sprocket and the Variable Camshaft Timing (VCT) actuator. Each drive adapter is equipped with a timing pin. The timing pin locates the drive sprocket and the VCT actuator on the camshaft relative to the lobe positions.
Each camshaft has a pressed on reluctor ring for use with the Camshaft Position (CMP) sensors. The 2 camshafts have a VCT actuator for the each of the camshafts. The VCT actuators contain a sprocket which drives the camshaft through a timing chain, driven from the crankshaft. The VCT actuators adjust the timing of 2 camshafts independently, increasing engine efficiency and performance as required.
There is a reluctor wheel pressed on to the opposite end of the both camshafts which are monitored by the 2 CMP sensors. The 2 CMP sensor signals are used by the Powertrain Control Module (PCM) and enables the PCM to determine the position of the camshafts. The camshafts can then be phased by the VCT actuators to provide increased performance and efficiency.