Yamaha XV19SX(C), Service Manual

Page: 279 / 494

CAMSHAFTS
5-30
2. Measure:
• Compressed decompression cam spring
force “a”
Out of specification
→
Replace the decom-
pression cam spring.
EAS23990
CHECKING THE OIL DELIVERY PIPE
1. Check:
• Oil delivery pipe 1
Damage
→
Replace.
Obstruction
→
Wash and blow out with com-
pressed air.
• O-rings
Damage/wear
→
Replace.
EAS24030
INSTALLING THE CAMSHAFTS
1. Install:
• Camshafts
NOTE:
Lubricate molybdenum disulfide oil onto the
camshaft journals and lobes.
2. Install:
• Camshaft cover 1 “1”
• Oil delivery pipe 1 “2”
NOTE:
Tighten the camshaft cover bolts in stages and
in a crisscross pattern.
3. Install:
• Straight keys
• Right balancer drive gear “1”
• Right balancer driven gear “2”
• Camshaft driven gear
NOTE:
• Cover the crankcase hole with a clean rag to
prevent the straight keys from falling into the
crankcase.
• Align the punch mark “a” on the right balancer
drive gear “1” with the punch mark “b” on the
right balancer driven gear “2”.
4. Tighten:
• Camshaft drive gear bolt “1”
• Right balancer driven gear bolt “2”
NOTE:
• Lubricate the camshaft drive gear bolt and right
balancer driven gear bolt threads with engine
oil.
Decompression cam spring
Installed compression spring
force
0.1335–0.1631 N (0.0300–0.0367
lb) (0.0136–0.0166 kgf)
Installed length
8.0 mm (0.31 in)
b. Installed length
T
R
.
.
Camshaft drive gear bolt
60 Nm (6.0 m·kg, 43 ft·lb)
Right balancer driven gear bolt
40 Nm (4.0 m·kg, 29 ft·lb)
2
1
1
2
b
a