Yamaha MT-01 T 2005 - Checking the Rocker Arms and Rocker Arm Shafts; Checking the Rocker Arm Bases; Checking the Push Rods

CAMSHAFTS
5-24
NOTE:
Calculate the clearance by subtracting the cam-
shaft journal diameter (camshaft cover side)
from the camshaft cover hole inside diameter.
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.
4. Measure:
• Rocker arm shaft outside diameter “a”
Out of specification → Replace.
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).
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.
Camshaft to camshaft cover
clearance
0.020–0.054 mm (0.0008–0.0021
in)
Rocker arm inside diameter
18.000–18.018 mm (0.7087–
0.7094 in)
Limit
18.036 mm (0.7101 in)
Rocker arm shaft outside
diameter
17.976–17.991 mm (0.7077–
0.7083 in)
Rocker-arm-to-rocker-arm-shaft
clearance
0.009–0.042 mm (0.0004–0.0017
in)
Valve push rod runout
0.3 mm (0.012 in)