Checking The Rocker Arm Bases; Checking The Push Rods; Checking The Valve Lifters And Valve Lifter Cases - Yamaha XV19SW Service Manual

4. Measure:
• Rocker arm shaft outside diameter "a"
Out of specification → Replace.
Rocker arm shaft outside diame-
ter
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)
EAS23920
CHECKING THE VALVE LIFTERS AND
VALVE LIFTER CASES
1. Check:
• Valve lifter
Blue discoloration/excessive wear/pitting/
scratches → Replace and check the lubrica-
tion system.
2. Check:
• Valve lifter case "1"
Damage/wear → Replace the valve lifter
case.
• O-rings "2"
Damage/wear → Replace the O-ring.
1
2
3. Measure:
• Valve lifter outside diameter "a"
Out of specification → Replace.
5-25
CAMSHAFTS