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Measure the valve clearance as
illustrated.
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1.Set special tool
crankshaft adapter (MB992000) to the crankshaft, and install
the crankshaft
pulley centre bolt and washer.
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2.
| caution |
The crankshaft should always
be rotated clockwise.
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Rotate the crankshaft clockwise until the mark on
the camshaft sprocket exhaust is aligned
with the mark on the upper surface of cylinder head. (Set
the No. 1 cylinder to TDC on the compression
stroke.)
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3.Make paint marks on 3
places at the camshaft sprocket exhaust by means of the
following
procedure as shown in Figure.
(1)
Make a paint mark on the place of 65 degree angle (6.5th
tooth) in the anti-clockwise
direction of the timing mark.
(2)
Moreover, make a paint mark on the place of 120 degree angle
(12th tooth).
(3)
Also, make a paint mark on the place of 120 degree angle
(12th tooth).
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| note |
The space between
the teeth of the camshaft sprocket
exhaust is 10 degree angle.
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4.Turn the crankshaft
clockwise and locate the paint mark of the camshaft sprocket
exhaust
on the upper surface of the cylinder head as shown in
Figure.
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5.The valve clearances
(arrows) shown in figure are measured.
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6.Using a thickness gauge,
measure the clearance between the cam base circle and the
valve
tappet.
If the measured value does not conform to the
standard value, record the measured
value.
Standard value (cold
engine):
Inlet valve 0.22 ± 0.04
mm
Exhaust valve 0.30 ± 0.04
mm
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7.Turn the crankshaft
clockwise and locate the paint mark of the camshaft sprocket
exhaust
on the upper surface of the cylinder head as shown in
Figure.
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8.Measure the valve
clearance at the location shown with an arrow.
If the
measured value does not conform to the standard value,
record the measured value.
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9.Turn the crankshaft
clockwise and locate the paint mark of the camshaft sprocket
exhaust
on the upper surface of the cylinder head as shown in
Figure.
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10.Measure the valve
clearance at the location shown with an
arrow.
11.If the measured value does not conform
to the standard value, record the measured
value.
12.Replace the valve tappet for the valve
whose clearance is out of the standard value.
| note |
Valve tappets are available in
31 sizes, at 0.02 mm intervals in the 5.10
- 5.70
mm range.
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13.Valve tappets should be
selected in the following manner.
(1)
Remove the valve tappet and measure its thickness.
(2)
Calculate the correct thickness for a new valve tappet as
follows that achieves the
standard valve clearance.
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)
For
removal and installation procedures for the valve tappet,
refer to  .
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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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3.
| caution |
Fix the camshaft on a vise not
to damage it.
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Fixing the hexagonal area of the inlet camshaft on a
vise, install the V.V.T. sprocket.
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4.
| caution |
When applying air pressure,
keep in mind that oil could splash.
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By applying air pressure slowly to the holed port
for the advanced angle, remove the stopper
pin.
5.Turn the V.V.T. sprocket housing in the
right and left directions. Check it smoothly
moves in the range of A (approximately 25°)
| note |
The stopper pin is locked in
the most retarded angle position.
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6..After the check, remove the 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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