Sierra Denali AWD V8-6.2L (2008)
The 6.0L LY6 CMP actuator has a 52 degree range of authority. With the engine not running and no engine oil pressure to the CMP actuator, the high
tension spring positions camshaft timing at the 7 degree advanced park position. During normal engine operation, and based on performance
requirements, the ECM may adjust camshaft timing, as required, within a range from 7 degrees advanced to 45 degrees retard.
CMP System Lubrication Flow and Actuator Operation
1. Oil enters the camshaft at the second main bearing journal (1).
2. Oil travels through the camshaft into the CMP actuator valve check ball (2) and filter (3).
3. Oil exits the valve and travels through the internal passages of the camshaft (4).
4. Oil exits the camshaft and enters the actuator oil entry ports.
5. Oil travels through the actuator and is directed back into the valve (5).
6. Valve spool position directs oil to the advance or retard passages of the actuator.
The valve may also, under certain conditions, be positioned in a neutral position with no flow to either the advance or retard passages of the actuator.
