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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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