Yamaha XVS13AW(C), Service Manual

Page: 223 / 422

CAMSHAFTS
5-17
EAS23840
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. Check:
• Camshaft oil passage
Obstruction
→
Blow out with compressed air.
EAS23870
CHECKING THE CAMSHAFT SPROCKETS
1. Check:
• Camshaft sprockets
More than 1/4 tooth wear “a”
→
Replace the
camshaft sprocket and the timing chain as a
set.
EAS23880
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to all of the
rocker arms and rocker arm shafts.
1. Check:
• Rocker arm
• Rocker arm roller
Damage/wear
→
Replace.
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pit-
ting/scratches
→
Replace or check the lubri-
cation system.
3. Measure:
• Rocker arm inside diameter
Out of specification
→
Replace.
Camshaft lobe dimensions
Intake A
42.988–43.088 mm (1.6924–
1.6964 in)
Limit
42.888 mm (1.6885 in)
Intake B
37.045–37.145 mm (1.4585–
1.4624 in)
Limit
36.945 mm (1.4545 in)
Exhaust A
43.156–43.256 mm (1.6991–
1.7030 in)
Limit
43.056 mm (1.6951 in)
Exhaust B
37.118–37.218 mm (1.4613–
1.4653 in)
Limit
37.018 mm (1.4574 in)
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
Rocker arm inside diameter
12.000–12.018 mm (0.4724–
0.4731 in)