Yamaha FJR13AY 2009, Service Manual

Page: 321 / 744

CAMSHAFTS
5-16
EAS23850
CHECKING THE CAMSHAFTS
1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches
→
Re-
place the camshaft.
2. Measure:
• Camshaft lobe dimensions “a” and “b”
Out of specification
→
Replace the camshaft.
3. Measure:
• Camshaft runout
Out of specification
→
Replace.
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification
→
Measure the camshaft
journal diameter.
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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.
Camshaft lobe dimensions
Intake A
33.050–33.150 mm (1.3012–
1.3051 in)
Limit
32.050 mm (1.2618 in)
Intake B
24.997–25.097 mm (0.9841–
0.9881 in)
Limit
23.997 mm (0.9448 in)
Exhaust A
33.050–33.150 mm (1.3012–
1.3051 in)
Limit
32.950 mm (1.2972 in)
Exhaust B
24.997–25.097 mm (0.9841–
0.9881 in)
Limit
24.897 mm (0.9802 in)
Camshaft runout limit
0.030 mm (0.0012 in)
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062 mm (0.0011–0.0024
in)