Yamaha Tenere 700 2020, Service Manual

Page: 73 / 472

PERIODIC MAINTENANCE
3-8
7. Adjust:
• Valve clearance
a. Remove the valve lifter and the valve pad
with a valve lapper.
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
and valve pad so that they can be installed in
the correct place.
b. Calculate the difference between the
specified valve clearance and the mea-
sured valve clearance.
Example:
Specified valve clearance = 0.11–0.20
mm (0.0043–0.0079 in)
Measured valve clearance = 0.25 mm
(0.0098 in)
0.25 mm (0.0098 in)–0.20 mm (0.0079 in)
= 0.05 mm (0.0020 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 touch-
es the valve lifter.
Example:
If the valve pad is marked “158”, the pad
thickness is 1.58 mm (0.0622 in).
d. Calculate the sum of the values obtained
in steps (b) and (c) to determine the re-
quired valve pad thickness and the valve
pad number.
Example:
1.58 mm (0.0622 in) + 0.05 mm (0.0020
in) = 1.63 mm (0.0641 in)
The valve pad number is 163.
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 = 163
Rounded value = 165
New valve pad number = 165
f. Install the new valve pad and the valve lift-
er.
TIP
• Lubricate the valve pad with molybdenum di-
sulfide oil.
• Lubricate the valve lifter with engine oil.
• Install the valve lifter and the valve pad in the
correct place.
• The valve lifter must turn smoothly when rotat-
ed by hand.
g. Install the exhaust and intake camshafts,
timing chain and camshaft caps.
TIP
• Refer to “CAMSHAFTS” on page 5-10.
• Lubricate the camshaft lobes and camshaft
journals with molybdenum disulfide oil.
• First, install the exhaust camshaft.
• Align the camshafts sprocket marks with the
cylinder head edge.
Valve lapper (ø14)
90890-04101
Valve lapping tool (14mm)
YM-A8998
a
G088885
Last digit Rounded value
0, 1, 2 0
3, 4, 5, 6 5
7, 8, 9 10
Valve pad range No. 150–240
Valve pad thickness
1.50–2.40 mm
(0.0590–0.0944 in)
Available valve pads
25 thicknesses in 0.05
mm (0.0020 in) incre-
ments
T
R
.
.
Exhaust camshaft cap bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Intake camshaft cap bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)