Lubrication Description

Lubrication Description




200 - Camshaft
209 - Valve Lifter - Non-Active Fuel Management
219 - Valve Lifter - Active Fuel Management
234 - Camshaft Position (CMP) Actuator Solenoid Valve
235 - CMP Actuator
407 - Oil Pump Screen
413 - Oil Pump
437 - Oil Filter
451 - Valve Lifter Oil Manifold
452 - Valve Lifter Oil Filter
455 - Active Fuel Management Oil Pressure Relief Valve
706 - Oil Pressure Sensor
752 - CMP Magnet

Pressurized oil is directed through the engine block lower oil gallery to the full flow oil filter where harmful contaminants are removed. A bypass valve is incorporated into the oil filter, which permits oil flow in the event the filter becomes restricted.


Oil is then directed from the filter to the upper main oil galleries and the valve lifter oil manifold assembly. Oil from the left upper oil gallery is directed to the crankshaft and camshaft bearings. Oil that has entered both the upper main oil galleries also pressurizes the valve lifter assemblies and is then pumped through the pushrods to lubricate the valve rocker arms and valve stems. Oil returning to the pan is directed by the crankshaft oil deflector. The oil pressure sensor is located at the top rear of the engine.


An oil passage at camshaft bearing location 2 permits oil flow into the center of the camshaft. Oil enters the camshaft exiting at the front and into the camshaft position (CMP) actuator solenoid valve. The CMP valve spool position is controlled by the engine control module (ECM) and CMP magnet. When commanded by the ECM, the CMP magnet repositions the CMP actuator solenoid valve spool directing pressurized oil into the CMP actuator to control valve timing. Refer to Camshaft Actuator System Description .


With active fuel management activated, the ECM commands the 4 solenoids to open, directing oil through the engine block oil galleries to the intake and exhaust valve lifters for cylinders 1, 4, 6, and 7.