Checking The Camshaft Sprockets - Yamaha 2012 TMAX XP500A Service Manual

4. Measure:
• Camshaft-journal-to-camshaft-cap clear-
ance
Out of specification → Measure the cam-
shaft journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062
0.0024 in)
Limit
0.08 mm (0.0031 in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft
caps).
b. Position a strip of Plastigauge® "1" onto the
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
TIP
• When tightening the camshaft cap, tighten
the four bolts on the both ends of the cap
temporarily to lower the entire cap, while pay-
ing attention not to twist the dowel pins and
camshaft journal. After the camshaft cap
touches the cylinder head, tighten the two
bolts in the middle to the specified torque
and then the remaining four bolts to the
specified torque.
• To prevent the camshaft cap from cracking,
tighten the camshaft cap carefully by tapping
mm (0.0011–
5-13
the camshaft using a soft-face hammer (both
for temporary and final tightening).
• Do not turn the camshaft when measuring
the camshaft journal-to-camshaft cap clear-
ance with the Plastigauge®.
Camshaft cap bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "1".
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
5. Measure:
• Camshaft journal diameter "a"
Out of specification → Replace the cam-
shaft.
Within specification → Replace the cylin-
der head and the camshaft caps as a set.
Camshaft journal diameter
22.959–22.972 mm (0.9039–
0.9044 in)
EAS4B51035

CHECKING THE CAMSHAFT SPROCKETS

The following procedure applies to both of the
camshaft sprockets.
1. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a"→ Replace
the camshafts and the timing chain as a
set.
CAMSHAFTS