Operation Manual

PERIODIC MAINTENANCE
3-7
TIP
• Cover the timing chain opening with a rag to
prevent the valve pad from falling into the
crankcase.
• Make a note of the position of each valve
lifter “1” and valve pad “2” so that they can be
installed in the correct place.
b. Calculate the difference between the speci-
fied valve clearance and the measured
valve clearance.
Example:
Specified valve clearance = 0.15–0.22 mm
(0.0059–0.0087 in)
Measured valve clearance = 0.25 mm
(0.0098 in)
0.25 mm (0.0098 in) - 0.22 mm (0.0087 in)
= 0.03 mm (0.001 in)
c. Check the thickness of the current valve
pad.
TIP
The thickness “a” of each valve pad is marked
in hundredths of millimeters on the side that
touches the valve lifter.
Example:
If the valve pad is marked “155”, the pad
thickness is 1.55 mm (0.061 in).
d. Calculate the sum of the values obtained in
steps (b) and (c) to determine the required
valve pad thickness and the valve pad
number.
Example:
1.55 mm (0.061 in) + 0.03 mm (0.001 in) =
1.58 mm (0.062 in)
The valve pad number is 158.
e. Round off the valve pad number according
to the following table, and then select the
suitable valve pad.
TIP
Refer to the following table for the available
valve pads.
Example:
Valve pad number = 158
Rounded value = 160
New valve pad number = 160
f. Install the new valve pad “1” and the valve
lifter “2”.
TIP
• Lubricate the valve pad with molybdenum
disulfide oil.
• Lubricate the valve lifter (Top side) with
molybdenum disulfide oil.
• Lubricate the valve lifter (Outer side) with
engine oil.
Last digit Rounded value
0, 1, 2 0
3, 4, 5, 6 5
7, 8, 9 10
Valve pad range Nos. 120–240
Valve pad thickness
1.20–2.40 mm
(0.047–0.094 in)
Available valve pads
25 thicknesses in
0.05 mm (0.002 in)
increments