Yamaha F6AMH, Service Manual

Page: 276 / 510

CAMSHAFT AND VALVES
CHECKING THE CYLINDER HEAD
Measure:
Cylinder head warpage
Out of specification
Resurface or
replace.
Resurfacing steps:
(1)Place a 400 - 600 grit wet sandpaper on
the surface plate.
(2)Resurface the cylinder head using a
figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the
cylinder head several times.
REPLACING THE VALVE GUIDE
Replace:
Valve guide
Replacing steps:
NOTE:
Heat the cylinder head in an oven to 200°C
(392°F) to ease valve guide removal and
installation and maintain the correct
interference fit.
(1)Remove the valve guide using the
valve guide remover.
(2)Make a counter mark at the protrusion
dimension position from the cylinder
head on the new valveguide. Valve
guide protrusion dimension
a
.
(3)Using a valve guide installer, press fit
the valve guide so that the counter
mark on the valve guide is aligned with
the end face of the cylinder head.
Warpage limit:
0.1 mm (0.004 in)
Valve guide remover:
N.A./90890-06801
Projection dimension of the valve
guide
a
:
7.8 - 8.3 mm (0.307 - 0.327 in)
Valve guide installer:
YM-01112/90890-06801
5-48