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1.Remove the engine cover.
2. Remove air cleaner assembly.
3. Remove the surge tank.
4. Remove the cylinder head cover.
(1) Disconnect the ignition coil connector and remove the ignition coil.
(2) Remove the cylinder head cover.
5.Set the piston of the No.1 cylinder to TDC(Top Dead Center) position.
(1) Turn the crankshaft pulley clockwise and align its groove with the timing mark "T" of the timing chain cover.
(2) Check that the timing marks of the camshaft sprocket are in straight line on that of the cylinder head cover
surface as shwn in the illustration. It makes the piston of the No.1 cylinder position at TDC.
If not, turn the crankshaft one revolution clockwise.
6. Inspect the intake and the exhaust valve clearance.
(1) With the piston of the No.1 cylinder positioning at TDC, the valves which can be measured its clearance are as
shown below.
Measurement method.
a. Using a thickness gauge, measure the clearance between the tappet and the base circle of camshaft.
b. Record the out - of- specification valve clearance measurements. They will be used later to determine the
required adjusting tappet for replacement.
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Specification
Limit (Engine coolant temperature : 20°C [68°F])
Intake : 0.10 ~ 0.30mm (0.0039 ~ 0.0118in.)
Exhaust : 0.20 ~ 0.40mm (0.0079 ~ 0.0157in.)
(2) Turn the crankshaft pulley one revolution (360°) clockwise and align the groove with the timing mark "T" of the
timing chain cover.
(3) With the piston of the No.4 cylinder positioning at TDC, the valves which can be measured its clearance are as
shown below.
7.Adjust the intake and the exhaust valve clearances.
(1) Set the piston of the No.1 cylinder to the TDC/position.
(2) Remove the timing belt.
(3) Remove the camshaft bearing caps(A, B).
(4)Remove the camshaft assembly.
(5) Remove MLA(Mechanical Lash Adjuster)s.
(6) Measure the thickness of the removed tappet using a micrometer.
(7)Calculate the thickness of a new tappet so that the valve clearance comes within the specified value.
T : Thickness of removed tappet
A : Measured valve clearance
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N : Thickness of new tappet
Intake : N = T + [A - 0.20mm(0.0079in.)]
Exhaust : N = T + [A - 0.30mm (0.0118in.)]
(8) Select a new tappet with a thickness as close as possible to the calculated value.
Tappets are available with 41different size increments of 0.015mm (0.0006in.) from 3.00mm (0.118in.) to
3.600mm (0.1417in.)
(9) Place a new tappet on the cylinder head.
Apply engine oil on the periphery surface of the selected tappet.
(10) Install the intake and exhaust camshafts.
(11) Install the bearing caps.
(12) Install the timing belt.
(13) Turn the crankshaft two revolutions in the operating direction(clockwise) and realign crankshaft sprocket and
camshaft sprocket timing marks(A).
(14) Recheck the valve clearance.
Specification (Engine coolant temperature: 20°C[68°F])
Intake : 0.17 ~ 0.23mm (0.0067 ~ 0.0090in.)
Exhaust : 0.27 ~ 0.33mm (0.0106 ~ 0.0129in.)
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2007 > 2.7L V6 GASOLINE >
REMOVAL
1.Remove the engine cover.
2. Remove the front right wheel and tire.
3. Remove the right side cover.
4. Remove the drive belt(A), the idler(B) and the tensioner(C).
In removing the drive belt, fix a tool in the auto tensioner pulley bolt and turn the bolt counter clockwise.
5. Remove the timing belt upper cover(A).
6.Align the groove of the pulley with the timing mark of the timing belt cover by turning the crankshaft pulley
clockwise. Check if the timing mark of the camshaft sprocket is aligned with that of the cylinder head cover at the
moment.
(No.1 cylinder piston at TDC)
7.Remove the engine mounting bracket(A).
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6.Remove the auto tensioner set- pin.
7. Check the tension of the timing belt.
(1) Turn the crankshaft 2 rev. clockwise which makes the No.1 cylinder piston position at TDC.
After 5minutes, measure the length of the projected rod.
Specification
5 ~ 7mm(0.1969 ~ 0.2756in.)
(2)Ensure the locations of the timing marks for each sprocket.
8. Install the engine support bracket(A).
Tightening torque
58.8 ~ 68.6Nm(6.0 ~ 7.0kgf.m, 43.4 ~ 50.6lb- ft)
9.Install the timing belt lower cover(A).
Tightening torque
9.8 ~ 11.8Nm(1.0 ~ 1.2kgf.m, 7.8 ~ 8.7lb - ft)
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camshaft. Ensure that the pin will not be installed in the hole for oil feeding.
Tightening torque
66.7~78.5Nm(6.8~8.0kgf.m, 49.2~57.9lb - ft)
After tightening the CVVT bolts, rotate the CVVT assembly housing counterclockwise by hand to seat the lock
pin in the CVVT assembly in good position.
Fix the hexagonal part of the camshaft in a vice when tightening the CVVT bolts. Do not fix the CVVT housing
or sprocket in a vice.
4. Install the camshaft in the cylinder head assembly.
(1) Align the timing mark of the camshaft timinig chain.
LH camshaft chain timing mark
RH camshaft chain timing mark
Both timing marks should face upward in reassemby.
5. Install the timing chain tensioner.
(1) Insert the set pin by pressing the timing chain tensioner.
(2) Install the chain tensioner(A) in the cylinder head assembly.
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fluctuated even though turns on or off the input signal. The electrical ‘time constant’ is much more fast than one of
mechanical so the frequency of VFS is extremely higher than the conventional PWM type.
Characteristics of Bosch VFS:
Supply pressure : 700~1600kPa
Control pressure: typically 600~0 kPa
Current range: typically 0~1,000 mA
Dither frequency: Up to 600 Hz
Dimension: 32 mm protrusion reach 42 mm
The reducing pressure will be supplied to the ‘Supply’ port of the VFS valve on the above illustration to control the line
pressure.
Reducing pressure
Function
As same as one of Alpha or Beta automatic transaxle system, this reducing valve length can be adjusted by rotating
the screw on the picture. As you rotate the screw toward clockwise by 90°, the reducing pressure will increase about
1.0bar. However, the reducing pressure is used just as a ‘supply pressure’ for the solenoid valves (except
Low&Reverse, Reduction and Damper Clutch control solen), so this may not be handled to rotate in the field service
shop. VFS is operated based on the ‘supply pressure’ and it outputs the ‘control pressure’ to control the regulator
valve indirectly. While developing the VFS system, the line pressure was used as a ‘supply pressure’ for VFS and
other solenoid valves but it has been changed into additional ‘reducing pressure’ because the line pressure is variably
changed by VFS so the control pressure becomes unstable and some hydraulic pressure oscillation occurred. That is
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[REAR]
Standard value :
Toe- in (B- A) mm (in) : 2.6 ± 2 (0.1024 ± 0.0787)
Adjust the toe - in by turning the cambolt of the assist arm.
Left cambolt : Clockwise → toe - in
Right cambolt : Clockwise → toe - out
The variation of toe by a rotation of the cambolt :
About 3.2 mm (0.126 in)
a. Each toe should be within ±1 mm (± 0.039 in).
If the difference between right and left is not within +2mm (0.079 in), repeat adjustment.
b. After adjusting the cambolt, tighten the nut to the specified torque.
Specified torque
90 ~ 120 Nm (9 ~ 12 kgf.m, 65.1 ~ 86.8 lb - ft)
CAMBER
[FRONT]
Camber is the inward or outward tilting of the wheels at the top.