Valve Seat Contact Surface; Inspection Of Valve Contact Area; Inlet And Exhaust Valve Guide Table; Exhaust Valve, Values Are For C50, C50M, S50 - Honda C50 Shop Manual

c
CO TAO
;~g
c · :: _ -;; :: ·
·e:: eaa evenly
e .:: e =::::e -:: o 1he valve
o lve seo· - - e
·:::·c· -~g
the valve.
--= ::
e seoi ior a
.__--=:::--
o-d
a co ntinuous
= -
-.g.
·::-a
va lue--->
I ~
1.3
10.040 ~0.05 1
inl
- :: re seat is recut with three types of cutter;
-::=
and 30° cutters.
--, oca ion a nd the width of the valve seat con-
==-
::-·eo is accomplished with the 60° and the 30°
· =-
-e-s whil e the
45°
cutter is used for the facing
::= ·-:e va lve contact area. (Fig.
3- 25, 3- 26)
=;nolly, the valve lopping operation is performed.
=
a::e a liberal amount of lopping compound on the
::: e face and lop the valves, applying a slight
::·essure while rotating to the right and left, using a
=-..::-ion cup lopping too l. Wash off the compound
·•oroughly and inspect th e seati ng w ith the bluing .
• I SP ECTION OF VALVE CONTACT AREA
Assemble the valve into the cylinder head as shown
- Fig. 3 .27 so that the valves ore well seated and
.- he cylinder head combustion chamber with oil,
---ect a bla st of air in fr o m the inlet and ex haust
:>or s and if any bubbles should appear, it is on
--dicotion that the volye seats ore not completely
sealed. (Fig.
3- 27)
Inlet and Exhaust -Valve Guide. (Fig.
3- 28, 3- 29)
Standard Value
Se rviceab le Limit
Outside
10 mm 10.394)
d"a
+0.065 10.003 in.l
+0.055
10.002 in.l
~terfer-
0.040- 0.065
ence fit
1o.oo2-o.oo26 in .)
5.5
mm 10.2 17)
Replace if over
•side dia
- 0-015 10.0006 in.)
-0.025 10.0010 in.l
5.53 mm
10.199 in .)
21
Exhaust Va lve, [
J
va lues ore for
C50, C50M, S50
Standard Va lue
Serviceable Limit
Total
63.9 12.483 in .)
Rep lace if
under
e ngth
( 65.3)
12.573 in.)
63.5
12.502 in.l
( 64.9)
12.557 in.l
5.5
mm 10.217 in.)
Replace if under
•em dia
- 0.055
10.0022 in.)
- 0.065
10.0026 in.l
5.4 mm
<0.213 in.l
ead
0.7 10.026 in.l
Replace if
unde r
··ic ness
± 0 .1 10.004 in.l
0.4
10.016 in.l
DER HEAD
17
V /alve face contact
;:~~z
~~~~~~~~::;=·0.5
0.020in
~
Cylinder head
combustion
chamber
Figure 3- 25. Valve seat contact area
Figure 3- 26. Reworking valve seat
1
'1
HiC ·
·ess of
1;:
~
valve
head)
:;~
~
0
' 0
~
~
0
seat cutter
Fi g ure 3- 27. Inspecting valve seal contact
5
.
5
rfi
- 0 .015
(a
2 17
-o.ooo6 in)
. - 0.025 . -0.0010in
Fieure 3- 28. Va lve euide