Yamaha WaveRunner VXR VX1800A, Service Manual

Page: 131 / 318

Camshaft
5-40
10. While squeezing the ends of the snap ring
“e” so that it fits into the groove “d” in the
timing chain tensioner rod “a”, release the
tensioner rod slowly until it is locked in
place.
11. Install a new gasket “1” and the timing
chain tensioner “2” onto the cylinder head,
and then tighten the timing chain tensioner
bolts “3” temporarily.
12. Install new gaskets “4” and the oil pipe “5”
to the cylinder head and timing chain ten-
sioner “2”, and then tighten the oil pipe
bolts “6” temporarily.
13. Tighten the timing chain tensioner bolts “3”
to the specified torque.
14. Tighten the oil pipe bolts “6” to the speci-
fied torque.
15. Turn the drive coupling “1” counterclock-
wise 2 full turns, and then check that the
camshaft turns smoothly.
TIP:
Check that the portion “a” of the timing chain is
taut. If the timing chain is not taut, turn the drive
coupling “1” slightly clockwise, and then check
that the timing chain is taut again.
16. Position piston #1 at TDC. See “Camshaft
removal” (5-34).
Valve clearance adjustment
1. Measure the valve clearances. See “Valve
clearance measurement” (3-11).
2. Remove the camshaft caps and cam-
shafts. See “Camshaft removal” (5-34).
a
b
c
e
d
e
5
6
2
3
3
4
4
1
Timing chain tensioner bolt “3”
10 Nm (1.0 kgf·m, 7.4 ft·lb)
Oil pipe bolt “6”
20 Nm (2.0 kgf·m, 14.8 ft·lb)
Coupler wrench “2”
90890-06729
Coupler wrench “2”
YW-06729
2
1
a