Yamaha RS90K Manuel D'atelier page 454

3. Measure:
4. Measure:
Measurement steps:
• Install the camshaft into the cylinder head (with-
• Position a strip of Plastigauge
• Install the dowel pins and camshaft caps.
1
NOTE:
• Tighten the camshaft cap bolts in stages and in a
• Do not turn the camshaft when measuring the
1
• Remove the camshaft caps and then measure
5. Measure:
5-18
CAMSHAFTS
• Camshaft runout
Out of specification → Replace.
Camshaft runout:
0.03 mm (0.0012 in)
• 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)
out the dowel pins and camshaft caps).
camshaft journal as shown.
crisscross pattern, working from the inner caps
out.
camshaft journal-to-camshaft cap clearance with
®
the Plastigauge .
Camshaft cap bolt:
10 Nm (1.0 m · kg, 7.2 ft · lb)
the width of the Plastigauge
• 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)
ENG
®
1 onto the
®
1.