Checking The Camshafts - Yamaha 2008 Fazer FZ1-N Service Manual

EAS23850

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches →
Replace the camshaft.
2. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of specification → Replace the cam-
shaft.
Camshaft lobe dimension limit
Intake camshaft "a"
32.50–32.60 mm (1.280–1.284
in)
Limit
32.40 mm (1.276 in)
Intake camshaft "b"
24.95-25.05 mm (0.982-0.986
in)
Limit
24.85 mm (0.978 in)
Exhaust camshaft "a"
30.70-30.80 mm (1.209-1.213
in)
Limit
30.60 mm (1.205 in)
Exhaust camshaft "b"
22.95–23.05 mm (0.904–0.908
in)
Limit
22.85 mm (0.900 in)
3. Measure:
• Camshaft runout
Out of specification → Replace.
Camshaft runout limit
0.03 mm (0.0012 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clear-
ance
Out of specification → Measure the cam-
shaft journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062
0.0024 in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft
caps).
b. Position strip of Plastigauge® "1" onto the
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
NOTE:
• 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 clear-
ance with the Plastigauge®.
Camshaft cap bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "2".
5-12
CAMSHAFTS
mm (0.0011–