Yamaha YZF-R1 2020, Руководство по обслуживанию

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CAMSHAFTS
5-25
EAS30259
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to all of the
rocker arms and rocker arm shafts.
1. Check:
• Rocker arm
Damage/wear
→
Replace.
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pitting/
scratches
→
Replace or check the lubrication
system.
3. Measure:
• Rocker arm inside diameter “a”
Out of specification
→
Replace.
4. Measure:
• Rocker arm shaft outside diameter “a”
Out of specification
→
Replace.
EAS30258
CHECKING THE TIMING CHAIN AND
CAMSHAFT SPROCKET
1. Check:
• Timing chain
Damage/stiffness
→
Replace the timing
chain and camshaft and camshaft sprocket
as a set.
2. Check:
• Camshaft sprocket
More than 1/4 tooth wear “a”
→
Replace the
camshaft sprockets and the timing chain as a
set.
EAS30265
CHECKING THE TIMING CHAIN GUIDES
The following procedure applies to all of the
camshaft sprockets and timing chain guides.
1. Check:
• Timing chain guide (exhaust side)
• Timing chain guide (intake side)
Camshaft journal diameter
25.459–25.472 mm (1.0023–
1.0028 in)
Rocker arm inside diameter
7.987–8.002 mm (0.3144–0.3150
in)
Limit
8.017 mm (0.3156 in)
G0 88 949
a
Rocker arm shaft outside diame-
ter
7.967–7.979 mm (0.3137–0.3141
in)
Limit
7.936 mm (0.3124 in)
a. 1/4 tooth
b. Correct
1. Timing chain
2. Camshaft sprocket
a
G0 88 952
a
1
2
b
G0 88 950