Removing The Rocker Arms; Checking The Rocker Arms - Yamaha 2004 Rhino 660 YXR660FAS Service Manual

ROCKER ARMS

REMOVING THE ROCKER ARMS

1. Remove:
• rocker arm shafts 1
• rocker arms 2
NOTE:
Use a slide hammer bolt 3 and weight 4 to
remove the rocker arm shafts.
Slide hammer set
P/N. YU-01083-A
Slide hammer bolt (M6)
P/N. 90890-01083
Weight
P/N. 90890-01084

CHECKING THE ROCKER ARMS

1. Check:
• rocker arm lobes 1
• valve adjusters 2
Blue discoloration/pitting/scratches →
Replace.
2. Check:
• rocker arms
• rocker arm shafts
Damage/wear → Replace.
M MMM M MMM M M MMM M
a. Check the two contact areas on the rocker
arms for signs of abnormal wear.
1) Rocker arm shaft hole
2) Camshaft lobe contact surface
Excessive wear → Replace.
b. Check the surface of the rocker arm shafts.
Blue discoloration/pitting/scratches →
Replace/check lubrication.
c. Measure the inside diameter a of the
rocker arm holes.
Out of specification → Replace.
Rocker arm inside diameter
12.000 ~ 12.018 mm
(0.4724 ~ 0.4731 in)
4 - 15
ENG
M MMM M M MMM M M MMM M MMM