Checking The Cylinder Head; Replacing The Valve Guide - Yamaha F6AMH Wartungshandbuch

CAMSHAFT AND VALVES

CHECKING THE CYLINDER HEAD

Measure:
Cylinder head warpage


Out of specification
replace.
Warpage limit:
0.1 mm (0.004 in)
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.
Valve guide remover:
N.A./90890-06801
(2)Make a counter mark at the protrusion
dimension position from the cylinder
head on the new valveguide. Valve
guide protrusion dimension
Projection dimension of the valve
a
guide
7.8 - 8.3 mm (0.307 - 0.327 in)
(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.
Valve guide installer:
YM-01112/90890-06801
5-48
Resurface or

a
:
.