Checking The Camshafts - Yamaha Tracer MT09TRAH 2017 Service Manual

Camshaft wrench
90890-04162
Camshaft wrench
YM-04162
EAS30257

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches  Re-
place the camshaft.
2. Measure:
• Camshaft lobe dimensions "a"
Out of specification  Replace the camshaft.
Camshaft lobe dimensions
Lobe height (Intake)
36.290–36.390 mm (1.4287–
1.4327 in)
Limit
36.190 mm (1.4248 in)
Lobe height (Exhaust)
35.720–35.820 mm (1.4063–
1.4102 in)
Limit
35.620 mm (1.4024 in)
3. Measure:
• Camshaft runout
Out of specification  Replace.
Camshaft runout limit
0.030 mm (0.0012 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification  Measure the camshaft
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062 mm (0.0011–0.0024
in)
Limit
0.080 mm (0.0032 in)
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a. Install the camshaft into the cylinder head
(without the camshaft caps).
b. Position strip of Plastigauge® "1" onto the
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
TIP
• 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
10 N·m (1.0 kgf·m, 7.2 lb·ft)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "2".
5-12
CAMSHAFTS