Yamaha YFM400FWA 2000 5GH3-AE1, Руководство по обслуживанию

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ENG
CAMSHAFT, ROCKER ARMS AND VALVES
●
Inspect the surface of the rocker arm shafts.
Blue discoloration/pitting/scratches
→
Replace/check lubrication.
●
Measure the inside diameter
a
of the
rocker arm holes.
Out of specification
→
Replace.
●
Measure the outside diameter
b
of the
rocker arm shafts.
Out of specification
→
Replace.
●
Calculate the clearance by subtracting the
rocker arm shaft outside diameter from
the rocker arm inside diameter.
Clearance greater than 0.08 mm (0.003 in)
→
Replace the defective part(s).
*********************************
Rocker arm inside diameter:
12.000 ~ 12.018 mm
(0.4724 ~ 0.4731 in)
Rocker arm outside diameter:
11.981 ~ 11.991 mm
(0.4717 ~ 0.4721 in)
Rocker arm to shaft standard
clearance:
0.009 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
VALVE AND VALVE SPRING INSPECTION
1.Measure:
●
Stem-to-guide clearance
Out of specification
→
Replace the valve
guide.
Stem-to-guide clearance =
valve guide inside diameter
a
–
valve stem diameter
b
Clearance (stem to guide):
Intake:
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
<Limit>: 0.08 mm (0.003 in)
Exhaust:
0.030 ~ 0.057 mm
(0.0012 ~ 0.0022 in)
<Limit>: 0.10 mm (0.004 in)