Checking The Rocker Arms And Rocker Arm Shafts; Checking The Rocker Arm Bases; Checking The Push Rods - Yamaha MT-01 T 2005 Service Manual

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
0.020–0.054 mm (0.0008–0.0021
in)
9. Check:
• Camshaft drive gears
• Camshaft driven 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)
Limit
18.036 mm (0.7101 in)
4. Measure:
• Rocker arm shaft outside diameter "a"
Out of specification → Replace.
Rocker arm shaft outside
diameter
17.976–17.991 mm (0.7077–
0.7083 in)
5. Calculate:
• Rocker arm to rocker arm shaft clearance
NOTE:
Calculate the clearance by subtracting the rock-
er arm shaft outside diameter from the rocker
arm inside diameter.
Above 0.08 mm (0.003 in) → Replace the de-
fective part(s).
Rocker-arm-to-rocker-arm-shaft
clearance
0.009–0.042 mm (0.0004–0.0017
in)
EAS23900

CHECKING THE ROCKER ARM BASES

1. Check:
• Rocker arm base
Cracks/damage → Replace.
EAS23910

CHECKING THE PUSH RODS

1. Check:
• Push rod
• Push rod end
Bends/damage → Replace.
2. Measure:
• Push rod runout
Out of specification → Replace.
Valve push rod runout
0.3 mm (0.012 in)
5-24
CAMSHAFTS