Camshaft - Yamaha Libero Workshop Manual

R-91
ENGINE INSPECTION AND REPAIR
Out of specification Ÿ Replace the Cylinder
Head
CAMSHAFT INSPECTION
4-19
6. Calculate :
Stem Guide Clearance
Stem-to-guide clearance =
Valve guide inside diameter –
Valve stem diameter
Stem-to-guide clearance limit :
Intake :
0.005 ~ 0.0325 mm
<limit : 0.075 mm>
Exhaust :
0.0125 ~ 0.026 mm
<limit : 0.075 mm>
7. Measure :
• Runout (valve stem)
Out of specification Ÿ Replace
Runout Limit :
0.01 mm
1. Inspect :
• Cam lobes
Pitting/scratches/blue discoloration Ÿ
Replace
2. Measure :
• Cam lobes dimension ç and è
Out of specification Ÿ Replace.
Cam lobes dimension :
Intake :
ç 25.356 ~ 25.456 mm
<limit 25.326 mm>
è 20.989 ~ 21.089 mm
<limit 20.959 mm>
Exhaust :
ç 21.360 ~ 21.460 mm
<limit 21.330 mm>
è 21.001 ~ 21.101 mm
<limit 20.971 mm>
3. Inspect :
• Camshaft oil passage
Chocked Ÿ Blow out oil passage with
compressed air.
ENG