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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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