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Hyundai Tucson: Camshaft - Description

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Mechanical System / Cylinder Head Assembly / Camshaft - Description

CVVD (Continuous Variable Valve Duration) System is a device to control the optimum open and close timing according to the driving mode by changing the valve opening section.

It is composed of cam shaft, CVVD assembly, and CVVD acatuator.

The valve opening time operates in proportion to the rpm of control shaft.

Operation

Operation Principle

CVVD System Operating Mode

Optimum Valve Timing by Engine Load

Removal

Removal

Disconnect the battery negative terminal.
Remove the cylinder head cover.

(Refer to Cylinder Head Assembly - "Cylinder Head Cover")

Turn the crankshaft damper pulley so that No. 1 piston is at top dead center.

(1) Turn the crankshaft damper pulley and align its groove with the timing mark on the timing chain cover

(2) Check the timing chain, be sure that the timing mark (A) of each sprocket

(2) Check the timing chain, be sure that the timing mark (A) of each sprocket is matched with the timing mark (B) (color link) of the timing chain.

If not, turn the crankshaft damper pulley by one revolution (360º).

Intake CVVT

Exhaust CVVT

Exhaust CVVT

Remove the Intake variable force solenoid (VFS) valve (A).
Remove the cam to cam guide (A).

Reomve the front bearing cap (A) and intake camshaft bearing caps (B).

Remove the service hole bolt (A).

Remove the engine mounting support bracket.

(Refer to Engine and Transaxle Assembly - "Engine Mounting")

Lift the engine using the jack to obtain space.
Release the lock by putting down rachet plate (B) of timing chain tensioner with using back of tiny awl (A).

Remove the intake oil control valve (OCV) & center bolt (A).

WARNING

WARNING

To prevent impurities from entering intake oil control valve (OCV) & center bolt, wear rubber gloves.
Intake oil control valve (OCV) and center bolt, hold the hexagonal portion on the camshaft with a wrench to prevent the camshaft from rotating.

Remove the CVVD assembly.

WARNING

After removing the CVVD unit, make sure that the parts such as lifter, cam, etc are not separated.
Ensure that the CVVD components are not damaged.

When Using the CVVD fixture

(1) Install the CVVD fixture (A) over the CVVD assembly.

(2) Remove the CVVD assembly.

When not using the CVVD fixture

(3) Remove the CVVD assembly. Remove the Intake CVVT (A). Installation Install the Intake CVVT (A). Install the CVVD assembly (A). WARNING After installing the CVVD, check whether the swing arm is separated

When Using the CVVD fixture

When installing the CVVD assembly mounting bolts (M6), tighten sequence shown. Tightening torque : 1ST 4.9 - 6.9 N.m (0.5 - 0.7 kgf.m, 3.6 - 5.1 lb-ft) 2nd 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft) Remove the CVVD fixture

Intake/Exhaust CVVT Timing Mark

Intake CVVT Timing Mark Exhaust CVVT Timing Mark Install the cam to cam guide (A). Tightening torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft) Install the intake variable force solenoid (VFS) valve (A). Tightenin

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