Table of Contents
Advertisement
16
3.
.... ecc
Figure
3-
23.
Installing
the
cylinder
head
4
fi9ure
3-
24.
Torquing
sequence
of
cylinder head
ENGINE
b. Inspection and repair
c.
The cylinder head
is
exposed to the high pressure
and temperature
resulting from
the combustion
of
the
fuel mixture;
further,
when
the
head is unevenly
torqued,
it may develop
cracks
o
r warpage and wil
l
be
the
cause of
defecti
ve
sea
ling
between the
head
and the
cylinder
and resul
t in gas
leak, air
sucking
and
drop in
compression.
The
warpage of
the
cylinder
head
does
not
develop suddenly
and
it may be overlooked, there-
.
fo
re, caution
should
be
excersized during
reassembly,
si
nce
the uneven
torqu
ing
o
f
the cylinder
head is a
ve
ry common
fault.
To
inspect for warpage of
the
cylinder
head,
apply
a thin
coat of
bluing
o
r
red lead
on
a
surface
plate
and work
the
mating
surface of the cylinder
head
on the surface plate; the
warpage
can be
determined
by the transfer of the bluing on
to
the
cylinder head.
(Fig.
3-
21)
To
correct
the warpage,
lap
the
cylinder
head
on
the surface plate with a
~
200 sandpaper,
finally·
finish by using
a
~400
sandpaper
and then inspect
again with
the bluing.
(Fig. 3-22)
Ill
Cylinder head combusti
on chamber
[
J
for
C50,
C50M, S50
Standard
value
Height
15.66±0.05
[14.00±0.05
J
!0.620::::::
0.002
in.l
(0.552±0.002
in.l
2
13.1
::::
o.2cc
[
9.5±0.2cc
J
!.7994=
.01
22
cu in.l
!0.374±0.002
in.l
er
head
gasl::e'
· hickness.
S-c-cc·o
•
o'
e
___.,
1.0-
1.1
10.039-0.043 in)
:,-,·:eo::
e l'r:lii-->
eplace
if
under
0 .8 10.032 in)
C
·
-
;:;·
eod orque
(g-em
1
6.5
-9.0
ft
/
lbsl
eossembly
all
cylinder
head
together
with cam sprocket.
(Fig
.
3-
23)
(Caution)
hen
installing the cylinde
r
head,
do
not forget
o
install
the
"
0"
rings and dowel pins.
2
hen
torquing
the
cyl inder
head, tighten
the
nuts
in·
the
diagonal
sequence
to prevent
pres-
,ure
·
,ak~
Refer
to
Fig.
3.24
for
torquing
procedure.
(f'ig.
3-
':14)
3
In
he
some
procedure
.JS
in
the disassembly,
position
he woodruff keywc:.,
in the
crankshaft,
a d
the
"0"
mark on the
c,.,-
'!)rocket in
line
i'h
he
piston
and
install.
1.!1
Assemble the
right and
left cylinder
;1ead side
cover
.
- Quick Links:
- Engine
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
