Rocker Arm
The exhaust roller rocker arms (2) are stamped steel with an integral roller bearing. The exhaust rocker arms are attached to the hydraulic lifters (3) with a retaining clip (1).
NOTE:
The exhaust rocker arm and exhaust hydraulic lifter should not be unclipped during diagnosis and handling.
The intake two-step roller rocker arms (1) use oil pressure to control high or low intake valve lift depending on configuration.
Configuration is controlled by the Powertrain Control Module (PCM).
- Low lift position (1) - Pin Retracted
- High lift position (2) - Pin Extended
- Oil Pressure from the two-stop solenoid (3)