13521795

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/㎠, 21 psi ) of compressed air into the unsealed advance hole to release the lock.

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

caution

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.

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.

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)

caution

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.