Yamaha XJR1300(L) 99, Service Manual

Page: 122 / 338

4-10
ENG
CAMSHAFTS
NOTE:
EAS000204
CHECKING THE CAMSHAFTS
1. Check:
camshaft lobes
Blue discoloration / pitting / scratches
Re-
place the camshaft.
2. Measure:
camshaft lobe dimensions
a
and b
Out of specification Replace the cam-
shaft.
Camshaft lobe dimension limit
Intake / exhaust
a
Wear limit <28.15 mm>
b Wear limit <35.85 mm>
3. Measure:
camshaft runout
Out of specification
Replace.
Camshaft runout
Less than 0.03 mm
4. Measure:
camshaft-journal-to-camshaft-cap clear-
ance
Out of specification
Measure the camshaft
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.020 0.054 mm
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft caps).
b. Position a strip of Plastigauge

1 onto the
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
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
12 Nm (1.2 m kg)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge

2 .