Yamaha RS90K, Service Manual

Page: 454 / 841

5-18
ENG
CAMSHAFTS
3. Measure:
• Camshaft runout
Out of specification
→
Replace.
Camshaft runout:
0.03 mm (0.0012 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification
→
Measure the camshaft
journal diameter.
Measurement steps:
• Install the camshaft into the cylinder head (with-
out the dowel pins and camshaft caps).
• Position a strip of Plastigauge
®
1
onto the
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
®
.
• Remove the camshaft caps and then measure
the width of the Plastigauge
®
1
.
Camshaft-journal-to-camshaft-cap
clearance:
0.028 ~ 0.062 mm
(0.0011 ~ 0.0024 in)
Camshaft cap bolt:
10 Nm (1.0 m · kg, 7.2 ft · lb)
1
1
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:
24.459 ~ 24.472 mm
(0.9630 ~ 0.9635 in)