Checking The Rocker Arms And Rocker Arm Shafts - Yamaha MTN1000 2016 Service Manual

1
c. Install the dowel pins and camshaft caps.
ECA23010
NOTICE
There are two kinds of camshaft cap bolts
with different lengths. Be sure to install each
bolt onto the correct position.
a b
a. Camshaft cap bolt (black): 40 mm (1.57 in)
b. Camshaft cap bolt (silver): 35 mm (1.38 in)
A. Intake side
B. Exhaust side
TIP
• If the camshaft cap bolt is a new one, it is not
necessary to apply engine oil onto the mating
surface and threads of the bolt.
• If the camshaft cap bolt is a new one, tighten it
to 10 N·m (1.0 kgf·m, 7.2 lb·ft).
• Tighten the camshaft cap bolts in stages and in
a crisscross pattern, working from the inner
caps out.
• Do not turn the camshaft when measuring the
camshaft journal-to-camshaft-cap clearance
with the Plastigauge®.
Camshaft cap bolt
8 N·m (0.8 kgf·m, 5.8 lb·ft)
Camshaft cap bolt (new)
10 N·m (1.0 kgf·m, 7.2 lb·ft)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "2".
a b
5-15
2
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5. Measure:
• Camshaft journal diameter "a"
Out of specification  Replace the camshaft.
Within specification  Replace the cylinder
head and the camshaft caps as a set.
Camshaft journal diameter
25.459–25.472 mm (1.0023–
1.0028 in)
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
CAMSHAFTS
wear/pit-