Engine - INGENIUM I6 3.0L Petrol (G2341923): Description: Camshafts
| ITEM | DESCRIPTION |
|---|---|
| 1 | Ball bearing - Exhaust camshaft |
| 2 | Exhaust camshaft lobe (quantity 12) |
| 3 | Exhaust camshaft |
| 4 | Needle roller bearing - Exhaust camshaft (quantity 6) |
| 5 | Reluctor ring - CMP |
| 6 | Needle roller bearing - Intake camshaft (quantity 6) |
| 7 | Intake camshaft lobe (quantity 6) |
| 8 | Intake camshaft |
| 9 | HP fuel pump lobe |
| 10 | Ball bearing - Intake camshaft |
The engine is equipped with a Double Overhead Camshaft (DOHC) configuration, which uses 2 camshafts:
- There is 1 intake camshaft
- There is 1 exhaust camshaft.
The lobes on the exhaust camshaft control the opening and closing of the exhaust valves through the roller finger cam followers. There is a lobe that drives the HP fuel pump.
The lobes on the intake camshaft control the opening and closing of the intake valves through the 2 Continuous Variable Valve Lift (CVVL) assemblies.
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' and 'E' to denote inlet and exhaust. The camshaft caps are also numbered to support the install 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 VCT actuator. Each drive adapter is equipped with a timing pin. The timing pin helps to locate and time the rotor of the VCT actuator relative to the camshaft during assembly. Each camshaft has a pressed-on reluctor ring for use with the CMP s.
The VCT sprocket is driven by the crankshaft through the timing chain. The torque is transmitted from the VCT sprocket to the camshaft by hydraulic means. The VCT actuator adjusts the timing of both camshafts, increasing engine efficiency and performance as required. The reluctor wheels are pressed on to the opposite end of the exhaust camshafts which are monitored by the CMP . The CMP signal is used by the PCM and enables the PCM to determine the position of the camshafts. The camshafts can then be phased by the VCT actuators.