S-Type (X200) V8-4.2L (2005)
Camshaft: Description and Operation
Variable Camshaft Timing (VCT)
Oil is supplied to the front of each VCT actuator via the spider bracket assembly which contains the VCT actuator solenoid, supply oil galleries and
timing chain guide. Oil pressure advances and retards the camshaft timing which is controlled by the engine management system via a solenoid valve
mounted on top of the oil feed spider assembly. Camshaft timing, dependent on engine speed, load and oil temperature can be optimised over the
adjustment range of 30 degrees.