Continuously Variable Valve Timing (CVVT) Assembly

WARNING: This page is about a different variant/trim than selected.

Inspect the CVVT for smooth rotation.

Clamp the camshaft using a vise. Be careful not to damage the cam lobes and journals in the vise.
Check that the CVVT is locked by turning it clockwise or counterclockwise. It must not rotate.

Intake CVVT: Seal one of the two advance holes in the camshaft journal with tape.

Exhaust CVVT: Seal one of the two retard holes in the camshaft journal with tape.

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Intake CVVT:

Press the center of the valve bolt (A).
Apply approx. 50 kPa (0.5 kgf/cm² , 7 psi) of compressed air into the lock pin release hole to release the lock.

Courtesy of KIA MOTORS AMERICA, INC.

Exhaust CVVT: Apply approx. 150 kPa (1.5 kgf/cm² , 21 psi) of compressed air into the unsealed retard hole to release the lock.

Information

Cover the oil paths with a piece of cloth when applying compressed air to prevent oil from spraying.

Intake CVVT: With compressed air applied, rotate the CVVT into the advance direction (counterclockwise) within its phasing range and check that the CVVT turns smoothly.

Exhaust CVVT: With compressed air applied, rotate the CVVT into the retard direction (clockwise) and check that the CVVT turns smoothly.

CVVT phasing range

Intake: 40° (20° advanced and 20° retard from the initial position)

Exhaust: 20°±1° (from the most advanced position to the most retarded position)

Courtesy of KIA MOTORS AMERICA, INC.

Intake CVVT:

Move to the center to check that lock pin closes well.
Rotate the CVVT into the most advance position (counterclockwise) and then check that the CVVT is locked.

Courtesy of KIA MOTORS AMERICA, INC.

Exhaust CVVT: Rotate the CVVT into the most advanced position (counterclockwise) and then check that the CVVT is locked.