Yamaha R1 Series 2015 Service Manual page 356

4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062 mm (0.0011–0.0024
in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Install the camshaft into the cylinder head
(without the camshaft caps).
b. Position strip of Plastigauge® "1" onto the
camshaft journal as shown.
1
c. Install the dowel pins and camshaft caps.
ECA23010
NOTICE
There are two kinds of camshaft cap bolts
with different lengths. Be sure to install each
bolt onto the correct position.
Measure the camshaft
a b
a. Camshaft cap bolt (black): 40 mm (1.57 in)
b. Camshaft cap bolt (silver): 35 mm (1.38 in)
A. Intake side
B. Exhaust side
TIP
• If the camshaft cap bolt is a new one, it is not
necessary to apply engine oil onto the mating
surface and threads of the bolt.
• If the camshaft cap bolt is a new one, tighten it
to 10 Nm (1.0 m·kgf, 7.2 ft·lbf).
• Tighten the camshaft cap bolts in stages and in
a crisscross pattern, working from the inner
caps out.
• Do not turn the camshaft when measuring the
camshaft journal-to-camshaft-cap clearance
with the Plastigauge®.
Camshaft cap bolt
8 Nm (0.8 m·kgf, 5.8 ft·lbf)
Camshaft cap bolt (new)
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "2".
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
5. Measure:
• Camshaft journal diameter "a"
Out of specification
Within specification
head and the camshaft caps as a set.
5-15
CAMSHAFTS
a
2
Replace the camshaft.
Replace the cylinder
b