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1.Seal with a tape all the inlet camshaft ports for the advanced angle and the retarded
angle.
2.Make a hole on the port for the advanced angle.
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| caution |
Fix the camshaft on a vise not to damage it.
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3.Fixing the hexagonal area of the inlet camshaft on a vise, install the inlet V.V.T.
sprocket.
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| caution |
When applying air pressure, keep in mind that oil could splash.
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4.By applying air pressure slowly to the holed port for the advanced angle, remove the
stopper pin.
5.Turn the inlet V.V.T. sprocket housing in the right and left directions. Check it
smoothly moves in the range of A (approximately 12.5°<4B11>,approximately 20°<4B12>)
| note |
The stopper pin is locked in the most retarded angle position.
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6..After the check, remove the inlet V.V.T. sprocket from the inlet camshaft
7.Completely remove the tape sealing the inlet camshaft ports for the advanced angle
and for the retarded angle.
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Measure valve clearance in the following procedure.
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Check and adjust the valve clearance with the timing chain installed.
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1.Rotate the crankshaft clockwise to align the timing mark of the inlet V.V.T. sprocket
and the exhaust camshaft sprocket with the top surface of the cylinder head as illustrated.
(Set the No. 1 piston at top dead centre on the compression stroke.)
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2.Valve clearance can be measured at the illustrated location in this condition.
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3.Use a thickness gauge to measure clearance between the camshaft and valve tappet.
Standard value (cold engine)
Inlet side: 0.20 ± 0.03 mm
Exhaust side: 0.30 ± 0.03 mm
4.If measured values are out of the standard value, record measured values.
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5.Rotate the crankshaft by one turn clockwise to set the No. 4 piston at top dead centre
on the compression stroke.
| note |
The timing mark of the exhaust camshaft sprocket must be at the illustrated position.
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6.Valve clearance can be measured at the illustrated location in this condition.
7.If measured values are out of the standard value, record measured values.
8.If the measured value is out of the standard value, replace the valve tappet.
| note |
There are 47 kinds of valve tappets at intervals of 0.015 mm in the range between 3.000
and 3.690 mm.
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9.Select a valve tappet in the following procedure.
(1)
Measure thickness of a removed valve tappet.
(2)
Calculate thickness of a valve tappet so that valve clearance meets the standard value.
A: Thickness of valve tappet to be selected
B: Thickness of removed valve tappet
C: Measured valve clearance
Formula
Inlet side: A = B + (C - 0.20 mm)
Exhaust side: A = B + (C - 0.30 mm)
Refer to "Removal and installation of camshaft" for removal, installation and inspection
procedure of valve tappets.
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