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In.
ENGINE
16. Disassemble the cylinder head.
a.
Using
special
tool '·Valve Lifter'' (Tool
No.
07957
3290000),
compress the
valve spring, and remove Lhe
valve
cotters.
Release
lite tool and
remove
the
vnlve springs.
b.
If
ii is necessary to
remove
the valve guides because
of excessive clearance between the valve stem aud
valve g11ide, drive the g11ides from
the
cylinder
head
using "Valve Guide Remover''
(Tool
No.
07942-
3290100).
17. Remove the
6mm cylinder hold-down boll and
take out
the
cylinder.
J
8.
l'ry the pin
clip
from the
end
of the piston pin in the
piston; wilhdraw the
pin
and remove the
piston.
NOTE:
Place
a
waste
or rag
under
the piston to
prevent the pin
clip from falling
iJt the
crankcase.
Inspection
Camshaft and cylinder head
I. Check the point base and
cylinder
head
cover
for
ex-
cessive
wear
or
damage to the
camshaft
bearing surface..
2.
Check
the
clearanc.e
between
Ute rocker
arm
and
rocker
arm shan
Standard value:
O.Ol3-
0.043mm
(0.0005-0.0017-in.)
Service limit: 0.1 (0.0039-in.)
3.
Measure the
height of each
cam.
Standard value:
Intake
: 25.058mm (0.9865-in.)
Exhaust: 24.872mm (0.9792-in.)
Service
limit:
·
Intake
:
24.9mm (0.980:l-in.)
Exhaust
: 24.7mm (0.9724-in.)
4.
Check for wear or damage
lo the
oil seal
contact
surface of
camshaft
5.
Measure the valve
seat
width.
Coat
the valve
seat
with Prussian
blue~
then
set
Lhe vah•c
in place.
Rotate-
the valve one
turn
with lighr
pressure.
If
the Prussian
bl11e
shows
a
hond
of uniform width all
Lhe way around hoth seat and valve,
the
valve
contact
is
normal
If contact
is improper.
lightly
lap
the valve
with
a
finest
grade lappmg
compound. Remove
all
the
compound after
the
lapping operation. If
still
defective,
reface
the
valve seat
with
:i
v;ilve
seal
grinder, l\'lodcl
GVS-27A. recommended
by
HONDA.
Standard value:
1.0 1.4mm
(0.0394 0.0551-in.)
Service limit:
1.8mm (0.0709-in.)
NOTE:
When using a
Yafv('
seat
grinde.
r .
he
sure to follow
the
instructions
given
by
the tool manufacturer.
6.
Measure the outside diameter of the valve
stem.
Standard value:
lnt.,ke:
5.48-5.49mm
(0.2157 0.2161-in.)
Exhaust:
5 .4{i-5.472mm
(0.2150 0.21 S4-in.)
Service limit:
Intake:
5.42mm (0.2134-in.)
Exhaust:S.40mm
(0.2126-in.)
\
(1)
Fig.
3
-
7
(1)
Valve lifter
Fig.
3-8
(
I)
Valve guide remover
Fig.
3-
9
(I)
Piston pin
clip
(2)
Piston
pin
(3)
Piston
L
Fig. 3-10 Valve
,eat
15
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