Honda C70 Manual

							 
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CYLINDER
HEADIVALVE

CYLINDER
 IIEIIII
IIEIIIWIIL

Hem-zrue
 the
Front
 mover

[Ji:nur|net':1
 the
intake
 pi-pa
from
 the
cylinder
 Mad-

'FI|rr'ri;|;ri.ra
 the
|:ur|'|nr_'I
 |1|:||'l'l1
CDHEI
 in-DI
TUH1
 12I1B

rzcanlcshaft
 cnun'tercI0cIn'rir-0
 in
align
 the
"T"
 fl'lil'Ii

-m1h
 the
I11|;Iex
 mark.

Rqtnnvr
 the
l1'|UI'IIBI'

Rarn-due
 the
Fault
 plug
HP.

Rerneue
 the
cylinder
 hcn-I-I
Ielt
aide
 cover
 he

removing
 the
through
 halt
from
 the
rlghl
 !|IIIB.

Ramaue
 the
camshaft
 sprocket-
 INDEIII

MARK

1-’
 FI-
-L

'1'
 MARK

CYLINDER
 HEAD

LEFT
 SIDE
COVER
 .-A

.

l¢-
 _

SPFIDCKET
 ....nll\

l".I

IJ-ate'0f
 Issue:
May,
IEISD

IIIHDNDJI
 MOTOR
C11,
LTD.
 55

6-3  
						

							 
0v|.|rv0ee

HEADNALVE
 [flu
J

__:-"

HONDA

.~"'.T

LODBBII
 II1:
(:1.-lllrder
 I5
mm
 bnlt.

Remove
 the
cylinder
 heed
E
n'||'|'|
 halt
 and
r;-,-llndgr

head
 cover.

Fiarnave
 the
|:r-,rIIn.elet
 heed.

Remove
 the
D-rinqi.
 cvlintlet
 heed
gasket.
 and
rrlnlugl

pins.

[IYLINDEII
 IEIIIII
DISIISSEIIBLY

Rnmuvl:
 the
I:-pllndat
 head
right
aide
eeuer
 00.;-I

gasket.

Flume’-1|:
 the
valve
 Inspection
 cape
and
D-nnga.
 CYLINDER

IJCIWE
CYLINDER

HEAD
 CYLINDER

E-mrnBl'JL1'
 Blnm
BOLT

L
 PINS

'5'
st

‘I

.

‘II

GASKET
 O-RINGS

v.».|_ve
 INSPECTION
 cams

CYLINDER
 HEAD

FIIGHT
 SIDE
-.',‘JI]'lJ'EH

6-4
 ED

D-110
01
lawn:
 Mav,
T!-Ail]

I-DHDNDA
 MOTOR
£20..
LTD.
 ._._

_.-_

-I‘-I.  
						

							 
_|—.

|

'1-I-.

f,|—.
 F‘

ra-

'3".

.I"_‘*-

ll/"'.'*~.

If“-.
 r’-.-Eh!-Io1\tn.a.

$5,»
 010
 CTLINDEH

HEADIVALVE

Sgrgw
 an
E
rr|rn
 Ia::iIl
 |rr!t‘:
1'I‘|E
IDEIIZE-I’
 il'|TI
5I13"I'l'
 i1l'll'I

pull
 me
ihafi
 out
Qf
the
 I:','II|1rIEr
 I‘rEIB.|EI.

FI|.7rr|u'.r1}
 the
r-ackel
 arma.

Remuve
 lllc
camshaft
 aitgr-lnq
the
um
 IOI0e-.1.
 vvlth

the
 cvllnder
 head
cutcnts

gemmn
 ._h|_.
1,-.,|\.,-I
 gpriq]
 11u|1'1:cri_
 retainers.
 inrinpt

and
 valvea.

CAUTION:
 _
_
 ___
 ___
_
i

“fa
 pm-ma
 luvs
0|’
rvrlsinn.
 dv
Hr“
 IWPIPFFH
 I!!!‘

M-_r1.E
 55.-;',¢35
 fl1I[_|}‘£'
f.l':|¢|':.I
r|er:-es.sa'r_|-'
 I-‘r
rearmvel

|
 f|Ile'_lEElfI-!I‘.'I.

Hm-|1|1|\|g\
 \|I3|q'E
spring
 50.01:,
shim
I.E|.BJ
caps
 and
!1El"lI

seals.
 ROCKEn

AFIM5
 ROCKER
AFII1-I’

CAMSHAFT

VALVE
 SPRING
 CO
MPFIESSOR
 I:Imrn

HOLT

.-

Date
 ef
Issue:
 Mav,
IEIHO

IEHOHDA
 MOTOR
CO.
LTD.
 B-5  
						

							 
CYLINDE

R
HEADIVALVE
 I-Iowna./’

cm
 E13.»

Flam-1:00
 r.arb0n
deposits
 from
the
DIJ|'I‘|I.Il.'tlI|:|n

chamber.

CIEHH
 eff
the
 head
 gaslrart
 surface-.

NOTE
 ‘
 -
Aueid
 damegirrg
 the
gasket
 mrtnce.

-Gasket
 materiel
will
name
 c-ff
easier
 if
necked

in
 eelvant.

ROCKER
 ARM
INSPECTION

Iraap-a|:.t
 he
r0l:Iter
 arms
fer
damage,
 wear
ur
clogecl

all
 helet.

Manure
 the
I.D.
 of
the
 rueltar
 lr1'n.

BTAHDARD1
 10.000-1D.fl1E
IH|'II

III.393il'—II.H-I-I-3
 InI

SERVICE
 I..I'II'ITi'
10.'IEI
HIIH
IIIJSB
 IIII

ROCKER
 ARM
SHAFT
 INSPECTION

lnspa-r:r.tha
 maker
arm
ahalt
 fa-r
wear
 0r
damage.

Measure
 the
ELD.
 at
the
 rucker
 an-m
rI1:rl‘t.

STANDARD:
 H.371!-SSH
mm

10.09.20-0.303:
 ml

SEIWICE
 LIMIT:
9,91
rnrnII1.2!II12|nl

6-5
 O-ate

cf
Issue:
 May,
IQIBIJ

e5}-IIOI‘-IDA
 MOTOR
CO..
LTD.
 _,__

|—_

I-\.

."'HH"'

--._-
""'r

-\__  
						

							 
_;—\

__,.¢—.

.4

F

1"“-
 F1

'{""'\.

1""-

f""

‘,4--.

‘I;--.
 I-Iomnn.

I
 C10
 CYLINDER
HEADIVALVE

"-1;

CAMSHAFT
 INSPECTION

Using
 a
micrometer.
 measure
the
cam
 Inn-aa.

Ch-|:|:k
 ldr
wur
 ur
r.'Hr|'|B=g|:.

STAN
 DAHD:
 25.9?
mm
H.025
 inl

SERVICE
 LIMIT:
25.55
mm
I'I.fl"I1
 IIII

A‘?

CHMSHAFT
 DIL
CLEARANCE

Mnnum
 and
rrrcmd
 tha
camshaft
 iuurngl
CID-

Measure
 and
rennrd
 flan
cams!-um
 hearing
l.lJ.
in
the

cylinder
 baud.

Determine
 the
-|:a.m:h|'l1
 huurlng
oil
qlgimngg.

STANDARD:
 0.01
0-0115
 mm

[IJ.DIIJ3--0.11015
 H1]

SERVICE
 LIMIT:
DJD5
l'I1Il1
IIl.IIIlZinI

VALVE
 SPFIING
 FREE
LENGTH

INSPECTIUN

H-uaiurg
 tha
lgnglh
 Q‘!
lhq
 lnnur
 and
cuter
 \|'.ihIE-

5-prlhgi

ETANDQRDI
lrmur:
 25.1
mm
{D39
 In!

Uuur:
 25.1
rr|mI'l.11inI

SERVICE
 LIMIT:

lnnlr:
 23.9
mm
[U34
 InI

Dutar:
 25.9
mm
I‘I.l.'IE
 HI]

Date
 of
Issue".
 Mn-,
IBM
 53
 6-
7

E-HUI‘-IDA
 MDTDH
CCL,
LTD.  
						

							 
CY

Ll
ND
 E
Fl
 H
EA
 DFVALVE
 ‘I
'\'.

-

VA
 L"u"E
 STEM--TD-GU
 I
DE
 CLEA
 Fifl\i"aiCE

lru|.1:|:r
 finch
value
 for
i:|=enr.lln-g,
 1.1|.|ming,
wmdqqq
 |J|'

Msurmal
 i‘iIE*fl'|
wear.

Chuck
 vnlvn
muvnmant
 in
the
 guitin

Measure
 and
re-::urd
 path
vdluq
 stum
C|,|]_

STAN
 DAFID:

IN:
 E.i455—5.#B5
 mm
[H.211-8-0.2-152
 ini

EX:
 5.1-35-54145
 mm
ED.21-W-iJ.i14-l
 in]

SEFIVIBE
 LIMIT:

IIWEK:
 E.-40
mm
[H.213
 ini

NOTE
 _
_

I
 Fi-Ham
 tha
|pi-cia
 tn
remnue
 an-,'
cm-bun
 build-

up
 before
 Ghflfliing
 ulnranm.

"-IIBBII-IF!
 and
record
 ca-ch
tr-ltiul
 guide
 i.l'.i'.
using
 a

Bfflfiil
 hula
gauge
 cw
inrlida
 micrumatar.

STli"IDAH
 D:

IN,|'E}i'.:
 5.115--E.-GE
 mm

IU'.Z15B-0.2159
 irll

SEHMIIGE
 I.'IMiT:

INIEH:
 5.50
mm
IDJIB5
 lni

Ufllnrrminu
 the
I-tam-t|:|-puida
 daamnm.

STJUIIDA
 Fl
D:

IN;
 lJ.II‘iII—O.fl3fl
 mrn
ID.IHID4—D.iIl1ZIr1i-

EX:
 Il.D3D—Iii.UElJ
 mm
IEi'.III12—-
						

							 
‘I
1"‘

'11-“.

F
 K“
 1""

r'~

F‘

F‘
 _|—\.,__‘

1'7

I-""“'~
 HONDA

géé
 CT
[I
 CYLINDER

HEADIVFI
LVE

'H.l.VE
 EIIIIJE
REFLIIIIEIIEIIT

Support
 the
cyllndar
 head
and
drive
 the
g|.|lcla-
 out

from
 fin}
purl
 iirih.

MUTE
 U_
_

L
 vmm
 driving
 out
the
u-aha
 guide.
 do
not
 I

IIHFl'|I:tQ!
 Ii'H'.l
I'll!-IIIII

Install
 a
new
 uuanfza
 vulva
quilzln
 from
liw
In-P
 HI

the
 head.

Flpim
 lhu
haw
 viii‘!
 guide
 altar
lnllnlltl-I
 DH-
 VALVE
VALVE

D7912-‘l
 G
-REi".I'|I'J‘u'EFI

TCID

UIDE

DRIVER

VALVE
 GUIDE
FIEAMEFI

NOTE
 _
mas-maanuou
 E43
QM

1
 Uaa
 milling
 nil
on
11-we
 reumar
 dur"'Ia1|1il
 0'11""
 \
.
'

tlnn.

-
 Flmnu
 ma
rsamc-r
 whflfl
|I'I5IH‘TiI"-I
 Md
i9|'"'5"""§_l

FInI“u|;\5
 Iht:
vEIl'nE
 SBBI
llllflgi
 5-Tm.
 -*"'--
-:_"--
I
 I
"

/

Illa-an
 tha
cr-,r|i-\d=w
 mead
flwumuuhlv
 tn
rufl1fl'*!
 iflv
 _
L.-=""-..'='.-F
 -
I
 '
 --

maul
 particles
 _

—
 e---1
-.

_F.-IT
_

|
 I'._l

r-:~_.

{J-"_
-.’-'-"—"2I"'-J

,-

:-

I.

.
_

.___


						

							 
HON

na.
K

cirurueee
 HEADNALVE
 [:10

_
 _
 _i
 II

IIIIIVE
 SEIIT
IHSPEBTIUIUIIEFABIHE

Clmdh
 Ii-nth
intake
 mid
m-ch-ans!
 '-l'IIi'lJB=S-
themuqhiv
 tu

rum-we
 earhun
deposits
 Apply
e
light
 eeatirig
 0|‘

value
 lapping
 erampnund
 1|;
1_'!I,lI2|'1
 vglvu
 fem,
Lap

B-lfih
 '-‘alum
 and
suat
using
 I
rui:|i:|er
 here
or
d-ther

hand-lapping
 tout.

NOTE
 Take
 mere
net.
lu
allow
 lh:
mmpwnd
 It!
enter
 I

ilirlwflm
 the
valve-stem
 and
guide.

ll-lter
 lapping,
 wash
ciut
the
itmnpnund
 enm-

IJIETBW
 mil
apply
 a
edit
 of
engine
 ail
tu
the

waiira
 flue
an-d
seat.
 I

Humova
 the
value
 and
imnact
 the
flee.

CAUTION:

I
 The
 1‘i|h'I'£'.'.l‘
 mrmm
 be
I-ruiinii.
 If
mr
 1'a'1‘ve_|"m:'e

Lt
 r|:.I|:,ei1,
 P.-r.vr.1
:.:rre1'mI_1r_
 .'.Il'
er.1rrJ'u'::.'.
 riise
.aea'.|‘

rmurnp-er£_:',
 rile
1-u:t.|‘ve
 muxr
he
rep&:|rer1'

Inspect
 the
velve
 se-at.
 '

I1‘
 the
 aim
 in
rue
 wide,
 tee
narr-mu,
 er
has
 luv:
 spots.

the
 wilt
 mu:-1
 be
gruum:i-
 I

more

I
 Ii
H
VALVE
sen
WIDTH

H
 ,

Fulluw

the
refaeer
 rnenuIu|:turer's
 -p|:nerat.inq

iI'iII"\I-I:‘IiD|'|5.
 r‘

.

‘ff

-I’

ST-'5-ND-ll-RD:
 I.Clmm-iD.El-Iini

SERVICE
 LIIIIITI
T.5I'I'|I'I'|

iilEl&ini

PEI.’
 |

Alter
 nuttlnq
 the
seat,
 apply
 lapping
 eumpuui-|:l
 tn

the
 value
 feee,
and
lap
the
 value
 using
 light
pressure.

-lll'l|:r
 lapping.
 wish
any
residual
 Dfll'l'I|IlIJUI'IIi
 nI'l'
the

cylinder
 heed
end
value.

6_-I
 U
 55
[J-.;|1u
I'_lI
IQI-{IE
 M1-,=,
1980

€-HONDA
 MDTCIFI
GEL,
LTD.
 -'1-\.

--_\-

.—|._

.*""‘

--I.

‘T1.

.
 “\-  
						

							 
,—.

ft

HON
 nn.

Ikfij,-'
 [:11]
 cvtluuee
HEADNALVE

VALVE
 INi"-IEFI

‘T
 BILIHUIER
 nun
tsstmatt
 calm
=.~=-qt;

If’

if-'-~.
 1"“

re

1-

1""

I
 durtlagc.

.
 —'-.

1'“

._i
 i|t5IaiI

||:t\'
iiulv:
 sI|t'n
s:::l:..

Luhrit:-ate
 E-at-I'i
valve
 i1.£|‘|'|
'-\'|1J1
rnul'g|-l.trle|1um

|Ii|5-uiEiti|:
 |3|'I:'.?ISl!
:trt|;|
int-:|;:r1
 the
value
 intlj
1,115
I,|.3|';1|3

taiida.

NCITE
 Tu
 uuuid
 damage
 tn
the
 item
 |.r_ti|I,
tut-|1
 rhe_i

valve
 sitv-vlt,|
 vmen
irvsertinp.
 _

I‘-‘tililll
 the
‘valve
 sprinpt
 and
retainers.

lnetell
 the
valve
 cutters.

CAUTION:

l
 TH
 prr'1'E"JrI
 |‘r.‘rt,I.fij.'r1
|i'.i3'.g,_
|;J|'-'_.I
flur
 [r_1m'|r:Irfl.,\'
 {hf

uttivr
 r,t:Ir1'r|,z.Ir|-urr
 than
nt-ct'.t.tt:'r_t-
 ru
m.trei.|‘
 the

mire
 t.Tr{.l'
err.

Tap
 the
vei't-E
 !I'.n|11l
 pltllv
 with
|t
I-pit
 ltanlm-er
 In

firrnltr
 seat
the
valve
 cutter‘!-

|_
 '5u|-ipurl
 |l1'e_t:-gilrttler
 ha-ad
abuue
 the
we-ri

bench
 eurteue
 to
prevent
 tn-udfill-11¢
 vflivé

NOTE

_____
___
_
 -.¢.

I

I
 l

EPRING
 OUTER
 STEM
SEAL
 UALVE

CAP

HETP-INEFI
 SPFIING

%

%_,_

O.

seem.-e

51-em

seer
 seal.

III

I

_."

II 1

‘O

VAL
 '-."E
SPRING’
 ceueeesson

Deteo

IZIHUHDA
 "i'i':IlTDFt
Cll,
LTD.

Elisttttz

Hm,-',
i‘!31Bl'J
 6?
 6'1
1  
						

							 
HONDA

r"

tI:vurteee
 nen.erwt|.ve
 C-III
.
-.

lnutall
 the
ceneqrteft
 aligning
the
cam
 igbui
 wifl1
the

cvlihder
 heed
cuinutq.

Align
 the
camshaft
 huie
with
 the
qliind-qr
 head

5l'i|:lB:-I
 l'l'1B-tit
1'1-tr
ease
 tnrrulwfl
 _aprecJt'at
installation.

Apply
 a
thin
 cu-It
 of
engine
 pil
tci
the
 rucher
 arm

ti-nifu.

lnt-tell
 the
rucl-ter
 etml
and
trltnll-I
 with
lite
Illfflflilltl

ands
 facing
 cut.

II‘il.i{l'|Ii
 the
t:i,'ilntler
 head
tight
 sidia
ctrver
 using
e
new

Qltiiifl.
 .

_,_--

INDEK

MARK

I’;
.

l_
 Fl

ARM
 .

-\-

'
 |

r"'_"‘\,

CYLINDER
 HEAD

RIGHT
 CDVE
R
 -"
--

._"\".

-1.

6_-|
 2
 5*
Deteoflaeue:
Me-,-',
teen

‘E-"llUl"-ID.fl.
 IIICITITIFI
|::0.,
|.l'u.

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