Kia Cadenza: Cylinder Head Assembly / CVVT & Camshaft Repair procedures

Kia Cadenza YG 2016-2025 Service Manual / Engine Mechanical System / Cylinder Head Assembly / CVVT & Camshaft Repair procedures

Removal

Continuous Variable Valve Timing (CVVT)

1.	Remove the timing chain. (Refer to Timing System - "Timing Chain")

Remove the CVVT assembly.

•	A: LH exhaust CVVT

•	B: LH intake CVVT

•	C: RH intake CVVT

•	D: RH exhaust CVVT

When removing the CVVT assembly bolt, prevent the camshaft from rotating by using a wrench at position A.

Camshaft

LH Intake and Exhaust camshaft

1.	Remove the timing chain. (Refer to Timing System - "Timing Chain")

2.	Remove the LH exhaust camshaft oil control valve (OCV). (Refer to Engine Control/Fuel System - "CVVT Oil Control Valve (OCV)")

3.	Remove the fuel pump bracket (A)

4.	Remove the LH camshaft bearing cap (A) and thrust bearing cap (B).

5.	Remove the LH camshaft assembly (A).

RH Intake and Exhaust camshaft

1.	Remove the timing chain. (Refer to Timing System - "Timing Chain")

2.	Remove the RH exhaust camshaft oil control valve (OCV). (Refer to Engine Control/Fuel System - "CVVT Oil Control Valve (OCV)")

3.	Remove the RH camshaft bearing cap (A) and thrust bearing cap (B).

4.	Remove the RH camshaft assembly (A).

Inspection

Continuously variable valve timing (CVVT) Assembly

Inspect the CVVT for smooth rotation.

(1)	Clamp the camshaft using a vise. Be careful not to damage the cam lobes and journals in the vise.

(2)	Check that the CVVT is locked by turning it clockwise or counterclockwise. It must not rotate.

(3)	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. [Intake] [Exhaust]

(4)

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

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

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

(5)

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 : 25°±0°30’ (from the most retarded position to the most advanced position)

Exhaust : 25°±0°30’ (from the most advanced position to the most retarded position)

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

Camshaft

Inspect cam lobes.

Using a micrometer, measure the cam lobe height.

Cam height

[Standard value]

Intake : 46.6 mm (1.835 in.)

Exhaust : 45.8 mm (1.8031 in.)

If the cam lobe height is less than standard, replace the camshaft.

Inspect the camshaft journal clearance.

(1)	Clean the bearing caps and camshaft journals.

(2)	Place the camshafts on the cylinder head.

(3)	Lay a strip of plastigage across each of the camshaft journals.

(4)

Install the bearing cap (A) and thrust bearing cap (B) with specified torque. (Refer to Cylinder head in this group)

Tightening torque :

1st step : 5.8 N.m (0.6 kgf.m, 4.3 lb-ft)

2nd step : 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

Do not turn the camshaft.

(5)	Remove the bearing caps.

(6)

Measure the plastigage at its widest point.

Bearing oil clearance

[Standard value]

Intake

No.1 journal : 0.020 ~ 0.057 mm (0.0008 ~ 0.0022 in.)

No.2,3,4 journal : 0.030 ~ 0.067 mm (0.0012 ~ 0.0026 in.)

Exhaust

No.1 journal : 0.027 ~ 0.057 mm (0.0010 ~ 0.0022 in.)

No.2,3,4 journal : 0.030 ~ 0.067 mm (0.0012 ~ 0.0026 in.)

•	If the oil clearance is greater than specification, replace the camshaft.

•	If the oil clearance is still greater than specification after camshaft replacement, replace the bearing caps and cylinder head as a set.

(7)	Completely remove the plastigage.

(8)	Remove the camshafts.

Inspect the camshaft end play.

(1)	Install the camshafts.

(2)

Install the bearing cap (A) and thrust bearing cap (B) with specified torque.

Tightening torque :

1st step : 5.8 N.m (0.6 kgf.m, 4.31 lb-ft)

2st step : 9.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

(3)

Using a dial indicator, measure the end play while moving the camshaft back and forth.

Camshaft end play

[Standard value] :

0.02 ~ 0.18 mm (0.0008 ~ 0.0071 in.)

•	If the end play is greater than specification, replace the camshaft.

•	If the end play is still greater than specification after camshaft replacement, replace the bearing caps and cylinder head as a set.

(4)	Remove the camshafts.

Installation

Continuous Variable Valve Timing (CVVT)

Install the CVVT assembly.

Tightening torque :

64.7 ~ 76.5 N.m (6.6 ~ 7.8 kgf.m, 47.7 ~ 56.4 lb-ft)

•	Install camshaft-inlet to dowel pin of CVVT assembly. At this time, attend not to be installed to oil hole of camshaft-inlet.

•	Hold the hexagonal head wrench portion of the camshaft with a vise, and install the bolt and CVVT assembly.

•	Do not rotate CVVT assembly when camshaft is installed to dowel pin of CVVT assembly.

•	A: LH exhaust CVVT

•	B: LH intake CVVT

•	C: RH intake CVVT

•	D: RH exhaust CVVT

When installing the CVVT assembly bolt, prevent the camshaft from rotating by using a wrench at position A.

2.	Install the timing chain. (Refer to Timing System - "Timing Chain")

Camshaft

•	Apply a light coat of engine oil on camshaft journals.

•	Assemble the key groove of camshaft rear side to the same level of head top surface.

•	Be careful the right, left bank, intake, exhaust side before assembling.

LH Intake and Exhaust camshaft

Install the LH intake camshaft (A) and exhaust camshaft (B).

LH Intake camshaft

As for camshaft identification, refer to the table below.

Outer diameter
A	-
B	-
C	-
D	-
E	-

The LH intake camshaft dosen''t have identification ring.

LH Exhaust camshaft

As for camshaft identification, refer to the table below.

Outer diameter
A	27mm (1.0630in.)
B	27mm (1.0630in.)
C	30mm (1.1811in.)
D	27mm (1.0630in.)

Install the bearing cap (A) and thrust bearing cap (B) with specified torque.

Tightening torque :

1st step : 5.8 N.m (0.6 kgf.m, 4.3 lb-ft)

2nd step : 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

Be sure to install the thrust bearing cap bolts and the bearing cap bolts in the correct place.

Be careful the right, left bank, intake, exhaust side before assembling.

A : L(LH),R(RH)

B : I(Intake), None(Exhaust)

C : Journal number

D : Front mark

Rotate the crankshaft not to contact the valves to the pistons by making the pistons below 10mm(0.3937in.) from the top of cylinder block.

Install the fuel pump bracket (A)

Tightening torque :

18.6 ~ 23.5 N.m (1.9 ~ 2.4 kgf.m, 13.7 ~ 17.4 lb-ft)

4.	Install the other parts reverse order of removal.

RH Intake and Exhaust camshaft

Install the RH intake camshaft (A) and exhaust camshaft (B)

RH Inkate camshaft

As for camshaft identification, refer to the table below.

Outer diameter
A	30mm (1.1811in.)
B	27mm (1.0630in.)
C	30mm (1.1811in.)
D	30mm (1.1811in.)
E	30mm (1.1811in.)

RH Exhaust camshaft

As for camshaft identification, refer to the table below.

Outer diameter
A	27mm (1.0630in.)
B	27mm (1.0630in.)
C	30mm (1.1811in.)
D	30mm (1.1811in.)

Install the bearing cap (A) and thrust bearing cap (B) with specified torque.

Tightening torque

1st step : 5.8 N.m (0.6 kgf.m, 4.3 lb-ft)

2nd step : 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

Be sure to install the thrust bearing cap bolts and the bearing cap bolts in the correct place.

Be careful the right, left bank, intake, exhaust side before assembling.

A : L(LH),R(RH)

B : I(Intake), None(Exhaust)

C : Journal number

D : Front mark

Rotate the crankshaft not to contact the valves to the pistons by making the pistons below 10mm(0.3937in.) from the top of cylinder block.

3.	Install the other parts reverse order of removal.

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