Table of Contents
Advertisement
12
2
Inspecting 1he valve seat
The standard width
of
1he valve contac1
surface 1s 0 .040-0.061 (1 0-1.3 mm),
When
the
comae, surface becomes wider
than
0.080 (2.0
mm).
1he
valve
seat
should be repaired with a
seat cutter
(inc
luded
1n
the
special
tools)
.
Valve
seat is cut to the proper dimension
using
the valve
seat top and
interior cutlers
The
90°
seat cutter
,s
used
10
repair
the valve seat contact surface
CD
Valve loce
cwtiilct
area
(=>
ValvP.
guide
ca,
Cylinder hood bodv
Fig.
17
(1J
Vulvo
seul culler 90•
Ii
Vulve
seal
cu
tter
holder
Fig
18A
©
Valve
sea, ton
cuner
i,
Valve
seat
cuu,,
holder
Flg
.
188
(I)
Valve
se.at
11\ttHIO(
CUIU!f
~
Valve
seat cutter
holde1
Fig
.
18C
Whanovar
the valve seat has been repa11ed or
the valve replaced.
1he
valve
must
be
lapped
to
the scat.
To
lap
the
valve.
apply
a
small amount
of
lapping compound to the valve
contact
surface and rotate
the
valve back and
forth
against the seat using
a
suc11on cup
1001
•
li111ng the '<lalve off the
seat
occasionally
After the valve
lapping
,s
completed,
wash
orr
the
lapping compound thoroughly from both the seat and face of
the
valve
.
Finally. check the seating of the valve wtth Prussian blue or red lead to assure
that a
good
seat
has been obtained
.
Note:
l
.
Read
carelully
the
1ns1rucuon provided wtth 1he valve seat grinder
(Tool No
.
07782
-0020000.
A
set)
2
.
Apply
a
small
amount
of oil to the
valve
stem when inserting the va,ve
,mo
tho
guide.
3
After the
valve has been assembled 1n10 the
cvllnder
head.
check
tne seating
ot
the
valve by pouring
a
small quantity
of
engine 011
,nto
the
combui.t1on
chamber until the valve heads are
covered
and then apply compressed air at
28.4 psi (2 kg/cm!} alternatefy
into
the
inlet
and exhaust ports and
check
for any
bubbles arising lrom around the valve seats
rr
there
ara
no
bubbles.
the valves
are
sealing properly
Advertisement
Table of Contents
