Kia Rio: Inspection - CVVT & Camshaft - Cylinder Head Assembly - Engine Mechanical System - Kia Rio UB 2012-2019 Service ManualKia Rio: Inspection

Camshaft Assembly
1.
Inspect the cam height.
Using a micrometer, measure the cam height.

Cam height
Intake : 44.15mm (1.7382in)
Exhaust : 43.55mm (1.7146in)


If the cam lobe height is less than specified, replace the camshaft.
2.
Check the cranshaft journal for wear.
If the journal is worn excessively, replace the camshaft.
3.
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 journal.


(4)
Install the bearing caps and tighten the bolts with specified torque.

Tightening torque
1st step
M6 bolt : 5.9 N.m (0.6 kgf.m, 4.3 lb-ft)
M8 bolt : 9.8 N.m (1.0 kgf.m, 7.2 lb-ft)
2nd step
M6 bolts : 11.8 ~ 13.7N.m (1.2 ~ 1.4kgf.m, 8.7 ~ 10.1lb-ft)
M8 bolts : 18.6 ~ 22.6N.m (1.9 ~ 2.3kgf.m, 13.7 ~ 16.6lb-ft)


     
Do not turn the camshaft.
(5)
Remove the bearing caps.
(6)
Measure the plastigage at its widest point.

Bearing oil clearance
Standard :
0.027 ~ 0.058 mm (0.0011 ~ 0.0023 in)
Limit : 0.1 mm ( 0.0039 in)


A.
If the oil clearance is greater than specified, replace the camshaft.
B.
If necessary, replace the bearing caps and cylinder head as a set.
4.
Inspect the camshaft end play.
(1)
Install the camshafts.
(2)
Using a dial indicator, measure the end play while moving the camshaft back and forth.

Camshaft end play
Standard : 0.1 ~ 0.2 mm (0.0039 ~ 0.0079 in)


A.
If the end play is greater than specified, replace the camshaft.
B.
If the end play is still greater than specification after camshaft replacment, replace the bearing caps and cylinder head as a set.
(3)
Remove the camshafts.
CVVT (Continuously Variable Valve Timing) Assembly
1.
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.


(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∞±1∞ (from the most retarded position to the most advanced position)
Exhaust : 20∞±1∞ (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.
Removal
1. Remove the cyliner head cover. (Refer to Timing System) 2. Remove the timing chain cover. (Refer to Timing System) ...

Installation
1. Install the intake CVVT (A) and exhaust CVVT (B). Tightening torque : 63.7 ~ 73.5 N.m (6.5 ~ 7.5 kgf.m, 47.0 ~ 54.2 lb-ft) ...

See also:

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