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1.Remove the cylinder head
cover assembly (Refer to  ).
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2.
| caution |
Turn the crankshaft always
clockwise.
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Turn the crankshaft clockwise, and align the timing
mark on the exhaust camshaft sprocket
against the upper face of the cylinder head as shown in
Figure. Therefore No.1 cylinder goes
to the compression top dead centre.
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3.Apply the paint mark to
the 6.5th tooth (65 degrees) anti-clockwise from the timing
mark
on the exhaust camshaft sprocket.
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4.Turn the crankshaft
clockwise 130 degrees, and align the paint mark against the
upper
face of the cylinder head as shown in Figure.
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5.Using a thickness gauge,
measure the valve clearance with the arrow shown in Figure.
If
deviated from the standard value, make note for the valve
clearance.
Standard value (cold
engine):
Inlet valve 0.22 ± 0.04
mm
Exhaust valve 0.30 ± 0.04 mm
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6.Apply the paint mark to
the 12th tooth (120 degrees) anti-clockwise from the paint
mark.
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7.Turn the crankshaft
clockwise 240 degrees, and align the paint mark against the
upper
face of the cylinder head as shown in Figure.
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8.Check the valve clearance
with the arrow shown in Figure. In the same procedure as
5.
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9.Apply the paint mark to
the 5.5th tooth (55 degrees) clockwise from the timing mark
on
the exhaust camshaft sprocket.
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10.Turn the crankshaft
clockwise 240 degrees, and align the paint mark against the
upper
face of the cylinder head as shown in Figure.
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11.Check the valve clearance
with the arrow shown in Figure. In the same procedure as
5.
12.If the valve clearance is deviated from the
standard value, remove the camshaft and
the valve tappet (Refer to ).
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13.Using a micrometer,
measure the thickness of the removed valve tappet.
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14.Calculate the thickness
of the newly installed valve tappet through the following
equation.
A: Thickness of new valve
tappet
B: Thickness of old valve tappet
C:
Measured valve
clearance
Equation
Inlet
valve: A = B + (C - 0.22
mm)
Exhaust valve: A = B + (C -
0.30 mm)
| note |
The valve tappet ranges 5.10
- 5.70 mm and has 31 types per 0.02 mm.
The thickness
below a decimal point is stamped on the reverse
side of the valve tappet.
Example: In case
of 5.40 mm, "40" is stamped.
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15.Install the valve tappet selected through
the procedure 14.
16.Install the camshaft (Refer
to ).
17.Install
the cylinder head cover assembly (Refer to ).
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