Kia Sorento: CVVT & Camshaft Inspection
Continuously variable valve timing (CVVT) Assembly
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1. |
Inspect the CVVT for smooth rotation.
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(1) |
Clamp the camshaft using a vise. Be careful not to damage the
cam lobes and journals in the vise.
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(2) |
Check that the CVVT is locked by turning it clockwise or counterclockwise.
It must not rotate.
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(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]
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(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.
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Cover the oil paths with a piece of cloth when applying
compressed air to prevent oil from spraying.
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(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 : 22.5°±1° (from the most retarded position to
the most advanced position)
Exhaust : 20°±1° (from the most advanced position to
the most retarded position)
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(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.
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Camshaft
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1. |
Inspect the cam lobes.
Using a micrometer, measure the cam lobe height.
Cam height
[Standard value]
Intake : 44.10 ~ 44.30 mm (1.7362 ~ 1.7440 in.)
Exhaust : 44.90 ~ 45.10 mm (1.7677 ~ 1.7756 in.)
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If the cam lobe height is less than standard, replace the camshaft.
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2. |
Inspect the camshaft journal clearance.
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(1) |
Clean the bearing caps and camshaft journals.
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(2) |
Place the camshafts on the cylinder head.
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(3) |
Lay a strip of plastigage across each of the camshaft journal.
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(4) |
Install the bearing caps.
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Do not turn the camshaft.
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(5) |
Remove the bearing caps.
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(6) |
Measure the plastigage at its widest point.
Bearing oil clearance
[Standard value]
Intake :
No.1 : 0.022 ~ 0.057 mm (0.00087 ~ 0.00224 in.)
No.2, 3, 4, 5 : 0.045 ~ 0.082 mm (0.00177 ~ 0.00323
in.)
Exhaust:
No.1 : 0 ~ 0.032 mm (0 ~ 0.00126 in.)
No.2, 3, 4, 5 : 0.045 ~ 0.082 mm (0.00177 ~ 0.00323
in.)
[Limit]
Intake:
No.1 : 0.090 mm (0.00354 in.)
No.2, 3, 4, 5 : 0.120 mm (0.00472 in.)
Exhaust :
No.1 : 0.090 mm (0.00354 in.)
No.2, 3, 4, 5 : 0.120 mm (0.00472 in.)
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If the oil clearance is greater than maximum, replace the camshaft.
If necessary, replace cylinder head.
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(7) |
Completely remove the plastigage.
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(8) |
Remove the camshafts.
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3. |
Inspect the camshaft end play.
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(1) |
Install the camshafts.
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(2) |
Using a dial indicator, measure the end play while moving the
camshaft back and forth.
Camshaft end play
[Standard value] : 0.04 ~ 0.16 mm (0.0016 ~ 0.0063 in.)
[Limit] : 0.20 mm (0.0078 in.)
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If the end play is greater than maximum, replace the camshaft.
If necessary, replace cylinder head.
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(3) |
Remove the camshafts.
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Exhaust Camshaft Bearing
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1. |
Check the cylinder head bore mark.
Cylinder Head Bore Identification Mark
Cylinder Head Specifications
Class
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Mark
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Exhaust No.1 Inside Diameter Of Cylinder
Head Bore
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a
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A
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40.000 ~ 40.008 mm
(1.57480 ~ 1.5751in.)
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b
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B
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40.008 ~ 40.016 mm
(1.57511 ~ 1.57543 in.)
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c
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C
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40.016 ~ 40.021 mm
(1.57543 ~ 1.57563 in.)
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2. |
Select class of camshaft bearing same as class of cylinder head as shown
on the table below.
Exhaust Camshaft Bearing Identification Mark
Exhaust Camshaft Bearing Specifications
Cylinder
Head Bore
Class
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Bearing Class For Installing (Color)
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Thickness Of Bearing
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a (A)
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C (Green)
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1.996~2.000 mm
(0.07858~0.07874 in.)
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b (B)
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B (None color)
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2.000~2.004 mm
(0.07874~0.07890 in.)
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c (C)
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A (Black)
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2.004~2.008 mm
(0.07890~0.07905 in.)
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Oil clearance : 0 ~ 0.032 mm
(0 ~ 0.00126 in.)
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1.
Remove the cylinder head cover.
(Refer to Cylinder Head Assembly - "Cylinder Head Cover")
2.
Set No.1 cylinder to TDC/comp ...
1.
Install the intakeCVVT assembly(A), exhaust CVVT assembly(B) and camshaft(C).
Tightening torque :
53.9 ~ 63.7 N.m (5.5 ~ 6.5 kgf.m, 39 ...
See also:
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Engine power can be delivered to all front and rear wheels for maximum traction.
AWD is useful when extra traction is required on roads, such as, when driving on
slippery, muddy, wet, or snow-cove ...
Drive Belt Inspection
1.
Visually check the belt for excessive wear, frayed cords etc.
If any defect has been found, replace the drive belt.
...
Cylinder Head Inspection
Cylinder Head
1.
Inspect for flatness.
Using a precision straight edge and feeler gauge, measure the surface
the contacting the cylinder block and the manifolds fo ...
CVVT & Camshaft Removal
CVVT & Camshaft Installation