Checking The Rocker Arms And Rocker Arm Shafts - Yamaha XV19SX(C) Service Manual

a
a
5. Measure:
• Crankcase hole inside diameter "a"
Out of specification → Replace the crank-
case.
Crankcase hole inside diameter
25.000–25.021 mm (0.9843–
0.9851 in)
a
6. Measure:
• Camshaft cover hole inside diameter "a"
Out of specification → Replace the camshaft
cover.
Camshaft cover hole inside diam-
eter
28.000–28.021 mm (1.1024–
1.1032 in)
a
7. Calculate:
• Camshaft-to-crankcase clearance
Out of specification → Replace the defective
part(s).
a
a
NOTE:
Calculate the clearance by subtracting the cam-
shaft journal diameter (crankcase side) from the
crankcase hole inside diameter.
Camshaft to crankcase clearance
0.020–0.064 mm (0.0008–0.0025
in)
8. Calculate:
• Camshaft to camshaft cover clearance
Out of specification → Replace the defective
part(s).
NOTE:
Calculate the clearance by subtracting the cam-
shaft journal diameter (camshaft cover side)
from the camshaft cover hole inside diameter.
Camshaft to camshaft cover
clearance
0.020–0.064 mm (0.0008–0.0025
in)
9. Check:
• Camshaft drive gears
• Camshaft driven gears
• Front cylinder camshaft gears
• Rear cylinder camshaft gears
Chips/pitting/roughness/wear → Replace the
defective part(s).
EAS23890
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
Damage/wear → Replace.
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pitting/
scratches → Replace or check the lubrication
system.
3. Measure:
• Rocker arm inside diameter "a"
Out of specification → Replace.
Rocker arm inside diameter
18.000–18.018 mm (0.7087–
0.7094 in)
5-27
CAMSHAFTS