Yamaha Scorpio - Camshaft Inspection; Rocker Arms and Rocker Arm Shafts Inspection

4 - 18
ENG
CAMSHAFT AND ROCKER ARMS
YP402052
CAMSHAFT INSPECTION
1.Inspect:
●
Cam lobes
Pitting/Scratches/Blue discoloration
→
Replace.
2.Measure:
●
Cam lobes length
a
and
b
.
Out of specification
→
Replace.
Cam lobes length:
Intake:
a
36.52 ~ 36.62 mm
<Limit: 36.42 mm>
b
30.201 ~ 30.301 mm
<Limit: 30.1 mm>
Exhaust:
a
36.564 ~ 36.664 mm
<Limit: 36.46 mm>
b
30.216 ~ 30.316 mm
<Limit: 30.12 mm>
3.Inspect:
●
Camshaft oil passage
Stuffed
→
Blow out oil passage with com-
pressed the air.
YP402060
ROCKER ARMS AND ROCKER ARM
SHAFTS INSPECTION
1.Inspect:
●
Cam lobe contact surface
1
●
Adjuster surface
2
Wear/Pitting/Scratches/Blue discoloration
→
Replace.
***********************************************
Inspection steps:
●
Inspect the two contact areas on the rocker
arms for signs of unusual wear.
●
Rocker arm shaft hole.
●
Cam-lobe contact surface.
●
Excessive wear
→
Replace.