Variable Valve Timing: Notes

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Exhaust Phaser 

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Intake Phaser 

The engine is equipped with Variable Valve Timing (VVT). This system adjusts the timing of all four camshafts independently using solenoids and oil control valves to direct oil pressure into the camshaft phaser assemblies. The four phasers are located on the front of the camshafts, behind the VVT solenoids, inside of the engine timing cover.

• The camshaft phaser assembly advances and/or retards camshaft timing to improve engine performance, mid-range torque, idle quality, fuel economy, and reduce emissions.
• The exhaust phasers are identified with EXH and the intake phasers are identified with INT.
• The exhaust phaser has a clockspring, the intake phaser does not.
• The camshaft sprockets are integrated with the camshaft phaser and are serviced as an assembly. Do not attempt to disassemble the phasers, they are not serviceable.
• Phasers are interchangeable between the right and left cylinder heads, but should be installed in the same location as removed.

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The engine has an Oil Control Valve (OCV) (1) for each phaser. The OCV also acts as a bolt for mounting the Phaser to the camshaft. The OCVs spool valve is spring loaded and should move freely within the OCV body.