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

EAS31655
REMOVING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
1. Remove:
• Rocker arm shaft bolt "1"
• Straight plug "2"
• Rocker arm shaft "3"
• Rocker arm
3
2 3
EAS30257

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches  Re-
place the camshaft.
2. Measure:
• Camshaft lobe dimensions "a"
Out of specification  Replace the camshaft.
Camshaft lobe dimensions
Lobe height (Intake)
33.902–34.002 mm (1.3347–
1.3387 in)
Limit
33.802 mm (1.3308 in)
Lobe height (Exhaust)
33.637–33.737 mm (1.3243–
1.3282 in)
Limit
33.537 mm (1.3204 in)
3
1 3 2
1 3 2
3. Measure:
• Camshaft runout
Out of specification  Replace.
Camshaft runout limit
0.030 mm (0.0012 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification  Measure the camshaft
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062 mm (0.0011–0.0024
in)
Limit
0.080 mm (0.0032 in)
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a. Install the camshaft into the cylinder head
(without the camshaft caps).
b. Position strip of Plastigauge® "1" onto the
camshaft journal as shown.
5-14
CAMSHAFTS