Yamaha XV19SX(C), Service Manual

Page: 281 / 494

CAMSHAFTS
5-32
NOTE:
• Cover the crankcase hole with a clean rag to
prevent the straight key from falling into the
crankcase.
• Align the punch mark “a” on the camshaft driv-
en gear “1” with the punch mark “b” on the
camshaft drive gear “2”.
• Insert a cross-headed screwdriver into one of
the holes in the outer camshaft driven gear and
rotate the gear until the teeth of both driven
gears are aligned. The teeth of both camshaft
driven gears must be aligned for installation.
8. Tighten:
• Camshaft driven gear bolt “1”
NOTE:
• Place a folded copper washer “2” between the
teeth of the camshaft drive gear and camshaft
driven gear in order to lock them.
• Do not damage the teeth of the camshaft drive
and camshaft driven gears.
• After tightening the camshaft driven gear bolt,
remove the copper washer to clean the teeth of
the camshaft drive and camshaft driven gears.
EAS24050
BLEEDING A VALVE LIFTER
A valve lifter must be bled in the following cases.
• When installing a new valve lifter
• When the valve lifter leaks oil
1. Bleed:
• Valve lifter
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Fill a container with kerosene and place the
valve lifter into the container as shown.
Pump the plunger side of the valve lifter with
a press a number of times to let in kerosene.
CAUTION:
ECA14630
• Do not pump the valve lifter excessively.
• Kerosene is highly flammable.
b. Install the valve lifter into the engine.
CAUTION:
ECA14650
Be sure to install the valve lifter in its appro-
priate position.
c. Start the engine and warm it up.
d. Stop the engine.
e. Remove the camshaft sprocket cover.
f. Rotate the camshaft until the punch mark “1”
on the camshaft driven gear aligns with the
punch mark on the camshaft drive gear as
shown. This is the condition in which piston
#1 is at top dead center (TDC).
T
R
.
.
Camshaft driven gear bolt
60 Nm (6.0 m·kg, 43 ft·lb)
1
b
a
2
1. Kerosene
2. Valve lifter
1
2