Chapter 2 Basic Engine
_2._C-y_l_in_d_e_r_l_le_a_d
_________________________
3,4]H3(B)(C)E
2-5 Assembling the cylinder head
Partially tighten the bolts
in
the specified
order
and then
tighten to the specified torque,
being
careful that the head
does
not
get
distorted.
(1) Clean out
the
cylinder
head
bolt
holes.
(2)
Check
for foreign
matter
on
the
cylinder
head
surface
where
it
comes
in contact with
the
block.
(3) Coat the head bolt threads and nut seats with lube oil.
(4) Use
the
positioning
pins
to line up
the
head
gasket
with
the
cylinder block.
(5)
Match
up
the cylinder
head
with
the
head
gasket
and
mount
Exhaust manifold side
Q)
'O
0
0
0
0
·v;
Q)
18
12
10
3
1
5
7
13
15
<l)
'O
gJ
.iil
0
0
0 0
0
0
<ii
0
0 0
0 0
0
0
0
ro
Q)
,,::;
<J)
;\::
O'I
:>,.
0 0 0
0
Ol
u:::
0
0
0
0
0
t::
16
14
B
6
2
4
9
11
17
l~
0 0
0 0
F
Intake manifold side
kg-m
First
Second
Tightening torque
4.5~5.5
8.7~9.3
2-6 Measuring top clearance
( 1} Place a high quality fuse ( ¢1.Smm,
10mm
long) in three
posi!ions
on
the flat part of the piston head.
{2)
Assemble
the
cylinder
head
gasket
and the
cylinder
block and tighten the
bolls
in
the
specified order to the
specified torque.
{3)
Turn
the
crank, (in the direction of
engine
revolution),
and
press
the
fuse against the piston until it breaks.
(4) Remove the
head
and
take out the broken fuse.
(5)
Measure
the three positions where each fuse is broken
and calculate the average.
(O.Tl
~0.75mm
is
ideal)
Top
clearance
Printed
in
Japan
HINSHI-118009
mm
0.660~0.
780
2-9
2~
7 Intake and exhaust valve arms
Valve
arm
and valve arm
bushing
wear
may
change
open-
ing/closing
timing
of the
valve,
and
may
in
turn
affect
engine
performance
according
to
the
extent
of
the
change.
Valve rocker
w~m
'"'.
port
u
~,~;
Exhaust valve
~
A
rocker arm
r"f:-,
JJ
I l
~
Intake valve i
~
rocker arm ·
(1) Valve
arm
shaft and valve arm bushing
Measure the
outer
diameter
of the
shaft
and
the inner-
diameter
of
the
bearing,
and
replace
if
wear
exceeds
the
limit
mm
Standard Wearllmit
Intake
and
exhaust
valve rocker arrh
A
15.966~
15. 888
15.955
shaft outside dia.
Intake
and
exhaust
valve rocker arm
B
16.000~16.010
16.090
inside dia.
Valve rocker arm shaft
and bushing clearance
0.016~0.054
0.140
at assembly
Replace
the
valve
arm
shaft
bushing
if
it
moves
and
replace the entire valve arm
if
there
is
no tightening clear•
ance.
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