Yanmar YSE8 - Page 28

DisassemblY
1)
Detach the cylinder head
from
the engine,
remove thoroughly
carbon
from com-
bustion
surfaces of the cylinder
heed aDd from the internal
surlaces
of the
pre-
combustion
cha.mber, and
then inspect arld service
the va]ves.
2) Remove
the
split tapper collets
by
pressing
each
spring
holder
with spanner'
They
will come
off to\'rard the
combustion
chanber.
\
:1.
a.
?
Checking
&
Servicing
Check
point
YSES YSElZ
Intake 1042t1
-11100
104511
-11100
Exhaust
valve
L042ll
-11100
104511
-11110
Scmtches or
wear
on intake/exhaust
valve
seating
sudace.
Renew if stepped wear
or
deep
scratches.
Fit if
poor
fitting
ot
shallow scratches.
(Refer
to
next
column.
)
Note:
Seat width
should
be less
than 2 mm.
Lap if scratched
or worn
to a broader \ridth
than Specified.
Lapping
method
(If
heavily wor.n or
scratched, correct
with a seat cutter.
)
.:i
1. Lap
till scratches
are
gone
with
coarse
compound,
then
with fine compound.
For
finishing,
use oil .
wash off the lapping compound.
Apply red lead
to
the seat and check
fitting aterthe
lappin
operauon.
After that, be sure to
apply oil to seat.
Scratches or
wear
on cylinder
head valve
seat.
25