Kia Forte: CVVT & Camshaft Inspection
Camshaft
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1. |
Inspect the cam lobes.
Using a micrometer, measure the cam lobe height.
If the cam lobe height is less than specification, replace the
camshaft.
Cam height
Intake: 39.0 mm (1.5354 in.)
Exhaust: 38.7 mm (1.5236 in.)
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2. |
Check the surface of the camshaft journal for wear.
If the journal is worn excessively, replace the camshaft.
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3. |
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 and tighten the bolts with specified
torque.
Tightening torque
M6 bolts:
11.8 ~ 13.7 N.m (1.2 ~ 1.4 kgf.m, 8.7 ~ 10.1 lb-ft)
M8 bolts:
18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6
lb-ft)
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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.
If the oil clearance is greater than specification, replace
the camshaft. If necessary, replace the bearing caps and cylinder
head as a set.
Bearing oil clearance
Standard:
0.032 ~ 0.062 mm (0.00126 ~ 0.00244 in.)
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4. |
Inspect the camshaft end play.
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(1) |
Install the camshaft bearing caps.
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(2) |
Using a dial indicator, measure the end play while moving
the camshaft back and forth.
If the end play is greater than specification, replace
the camshaft.
If necessary, replace the bearing caps and cylinder head
as a set
Camshaft end play
Standard:
0.10 ~ 0.19 mm (0.0039 ~ 0.0075 in.)
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(3) |
Remove the camshafts.
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CVVT (Continuously Variable Valve Timing) 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.
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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 : 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)
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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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Use fender covers to avoid damaging painted surfaces.
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1.
Install the CVVT assembly (A) to the camshaft.
Tightening torque :
64.7 ~ 76.5 N.m (6.6 ~ 7.8 kgf.m, 47.7 ~ 56.4 lb-ft)
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CVVT & Camshaft Removal
CVVT & Camshaft Installation