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Valve Guide
Check the clearance from valve stem to
valve
guide
and,
if
it
exceeds
the
service limit, replace the valve guide
and
valve.
When
replacing
a
valve
wi th
its stem worn,
also replace the
valve guide.
To
replace
the
valve
guide,
use
a
press
and
remove
the
worn
guide
by
pressing it out from the underside of
the head out through the top.
14.5 -15.5
Valve guide
To install a new guide, press it into the cylinder head from the upper
side obtaining the illustrated dimension.
After installing the valve
guide, check the valve stem to guide clearance and,
if the clearance
is less than the standard value, ream the guide to achieve the desired
clearance.
Valve Seat
Check the valve seat for any damage and
incorrect
contact,
and,
if
defective,
correct
as
illustrated.
After
correcting, lap the valve and seat with
lapping compound.
more
the
the
If the valve seat surface recedes
than
the
service
limit,
replace
cylinder
head.
The
receding
of
valve
seat
surface
can
be
checked
measuring the installed height of the
by
valve spring.
CAUTION:
Check
the valve guide
for
any wear
before cor recting the
valve seat.
If necessary, replace the guide.
Amm
Bmm
Cmm
23.7
21.7
2.5
Valve
If the thickness
(T)
of the valve head
exceeds
the
service limi t,
replace the
valve.
If
the
top end
(A)
of
the
valve
stem
(surface in contact with the rocker arm)
is worn or dented, repair or replace.
40
A
!
r;;;I
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