Yamaha PZ50W Service Manual page 191

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5-22
CAMSHAFTS
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)
Measurement steps:
• Install the camshaft into the cylinder head (with-
out the dowel pins and camshaft caps).
• Position a strip of Plastigauge
camshaft journal as shown.
• 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 clearance with
®
the Plastigauge .
Camshaft cap bolt:
9 Nm (0.9 m · kg, 6.5 ft · lb)
• Remove the camshaft caps and then measure
the width of the Plastigauge
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:
21.959 ~ 21.972 mm
(0.8645 ~ 0.8650 in)
6. Inspect:
• Camshaft sprocket
More than 1/4 tooth a wear → Replace the
camshaft sprockets and the timing chain as a
set.
a 1/4 tooth
b Correct
1 Timing chain roller
2 Camshaft sprocket
ENG
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1 onto the
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1.