When removing the CVVT assembly bolt, fix position A using a wrench to prevent the camshaft from rotating.
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
Continuous Variable Valve Timing (CVVT) 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.
[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
1.
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.
2.
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.
Be sure to install the thrust bearing cap bolts and the bearing cap bolts in the correct place.
Be cautious not to damage the right and left banks, and intake and exhaust sides when assembling.
A : L(LH),R(RH)
B : I(Intake), None(Exhaust)
C : Journal number
D : Front mark
Rotate the crankshaft until the pistons are located 10mm
(0.3937in.) below the top of cylinder block so that it doesn''t come
into contact with the valves.
Be sure to install the thrust bearing cap bolts and the bearing cap bolts in the correct place.
Be cautious not to damage the right and left banks, and intake and exhaust sides when assembling.
A : L(LH),R(RH)
B : I(Intake), None(Exhaust)
C : Journal number
D : Front mark
Rotate the crankshaft until the pistons are located 10mm
(0.3937in.) below the top of cylinder block so that it doesn''t come
into contact with the valves.
3.
Install the rest of the parts in the reverse order of removal.
Description
Continuous Variable Valve Timing (CVVT) system advances or
retards the valve timing of the intake and exhaust valve in accordance
with the ECM control signal which is calculated by ...