Honda C65 - Exhaust Valve, Values Are for C50, C50 M, S50; Inlet and Exhaust Valve Guide Table; Inspection of Valve Contact Area; Valve Seat Contact Surface

c
CO TAO
;~g c· :: _ -;; :: · ·e:: eaa ev e nly
e .:: e =::::e -:: o 1h e va lv e
o
lv e seo· -- e ·:::·c· -~g the valve.
--= :: e seoi ior a .__--=:::-- o-d a co ntinuous
= - -.g.
·::-a valu e---> I ~ 1.3 1 0.040 ~0.05 1 inl
- :: re s eat is recut with three types of cu tter;
-::= and 30° cutt er s.
--, oca i on and the wid th of the valve seat con -
==- ::-·eo is accomplished wit h the 60° and the 30°
· =- -e-s whil e the 45° cutter is used for the facing
::= ·-:e va lv e contact area. (Fig. 3- 25, 3- 26)
=; nolly, the va lve lopping operation is performed.
= a::e a lib eral amount of lop ping compound on the
::: e f ace 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
·•oroug hly and inspect the seating with the bluing .
• I SP ECTION OF VALVE CONTACT AREA
Assemble the valve into the cylinder head as shown
- Fig. 3. 27 so th at the valve s ore we ll seated and
.- he cy linder head combustion chamber with oil,
- --ect a bla st of air in fr om the inlet and exhau st
:>or s and if any bubbles should appear, it is on
-- dicot ion that the volye seats ore not comp letely
sealed. (Fig. 3- 27)
In let and Exhaust - Valve Guide. (Fig. 3- 28, 3- 29)
Standard Value
Servi
ceab le
Limit
Outsi de
10 mm
10 .394)
d" a
+0.065
10.003 in.l
+0.05 5
10.002
in.l
~t erfer-
0.040 - 0.065
ence fit
1o . oo2-o . oo26 in .)
5.5 mm
10. 2 17)
Repla
ce if over
•side dia
- 0-015 10.0006 in.)
-0.025
10.0010 in.l
5.53 mm
10 . 199 in .)
21 Exhaust Va lv e, [ J values ore for C50 , C50M, S50
St andard Va lu e
Serv i ce abl e Limit
Total
63 .9 12 . 483 in .)
Repl
ace if
und
er
en gth
( 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
10.00 22 in.)
- 0.065
10.00 26 in.l
5.4 mm
<0.213 in.l
ead
0.7 10.026 in.l
Replace
if
under
·· ic ness
± 0.1
10 . 004 in.l
0.4
10.016 in.l
DER H EAD
17
V/ al ve f ac e co ntact ;:~~z
~ ~~~~~ ~~::;=· 0. 5
0.0 20in ~
Cylinder head
combu s tion
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 ur e 3- 27 . In s pe ct ing val ve seal contact
5
.
5
rfi - 0. 015 (a
2 17
-o . ooo6 in)
. - 0.025 . -0.0010in
Fieure 3- 28. Val ve euide