Crank Shaft, Connecting Rod, Piston - Honda C72 Shop Manual

,"
• lie m
Cylind er sleeve
Inlaying
space
Cylinder Over size
(oversize)
Cylind e r head In. dio.
(Cam shaft bearing
part)
Cylinder hea d In. dio.
(rocker orm pi n)
C ylinder head Comb ustio n
(rocker orm pi n) chamber
Cylinder he ad
!a tt aching face}
capacity
Bend
Cylinde r head Bend
(head cove r attach.
ing facel
Cylinder head
Unl e t po rn
In. dio.
Carburettor in su lat o r Gop of the
in. dio. of
inlet porI
Cylinde r heod gaske t Width
Cylinder pock ing
Toch om eter gea r
Tachometer gea r
Tach om~ !er
ge ar
"0" ri ng, 14m/ m
Tach ome ter gear
and bush
Width
In. d io. of
Bush
Out. d ir. o f
Bush
Tight nes s
Clearance
Cyli nder head cave r Flalneess
Br eathe r sield plate Thickn ass
Breather sield plote
Cylinder head cove r
Cylinder head co p
Cylinder head cap
"0"
rin g
Attaching
dire ction
Tighting
torq ue
Tighti ng
torque
Dio.
I Standard
0.02-0.05
0.00078 - 0.001%
0.25
0.0098
41.994-42.01
1.653 -1 .654
17.0-17.018
0.669 - 0.670
29.3 - 29.7 cc
0.03 less
0.00 1
0.03 less
0.001
25.5
1.003
0.5 less
0.0196
1. 0-1. 1
0.039 - 0.043
0.3-0.4
0.0118-0.0157
7.0-7.015
0.275 - 0.276
13.982-14.0
0.550-0.551
0.4
0.015
0.028 - 0.043
0.00 I - 0.00 I
0.03
less
0.001
1.0
0.0393
put forward
an a rrow
Bor ing
42 .06 more Ex change
1.655
17.05 mo re Exc hange
0.671
0.06 mo re
0.002
0.06 more
0.002
1.0 mo re
0.039
7.2 more
0.283
0.2 more
0.0078
0.0 6 more
0.002
1.9m-kg less
13.73
ftl
e
b
Rectify
Rectify
Rectify
Exchange
Exc hang e
Rect ify
Rectify
1.9 - 2.3 m-kg
13.73 -16 .62 ft/ eb
0.45 m- kg 0.35m-kg less
Re ctify
3.25
ftl
e
b
3.2
0.125
2~35 flt~s~
b
I I
0.0984
Ex change
20
Remarks
Be pr essed in at
the normal tern·
pe rature
3 cat ego ry of 0.25
!Referenlial value}
When
I~hling
When tighting
Unless o mi s!.ion,
there are no
troubles
U nless omission,
th e re are no
troubles
Be ca refu l of the
mark
8 spots are equal
B. Crank Shaft, Connecting Rod, Piston
I t e m Standard Repa irin g limit Adjusting Poin t Rema rks
Cron k sha ft camp.
Crank angle 180
0
" BI
Crank angle 360
0
III BI
Sprocket, center
Tooth 16
cronk shaft
Bottom dia.
36 .285 - 36.286
1.428 - 1.428
Gear, center crank
No. of tooth
22
shaft sprocket
Thick ness of 15.295 -1 5.337 15.1 less Ex ch an ge No. of crossover
crossove r
teeth
0 .602 -0.603 0.59 4 teeth 3
Oul. dia. 47 .9 -48.0 47.7 less Exchange
1.885 - 1.889
1.877
Out. dia.
38.003 - 38.0 15
38.05 mor e Exchange
1.496 - 1.496 1.498
Radial 0.006 - 0.0 14 0.05 more Ex change
clea ran ce
Center cronk wei ght
Oul. dia. of 25.991-25 .999 25.95 less Ex chang e
pi n 1.023 - 1.023
1.021
.
.'
Cent er cronk
shaft, In. dia . 25 .0 -25.02 0.0040 I {Re fe ren tial value!
pressed port
0.984 - 0.985
R. crank shafl,
In.
d ia. 25.907 - 25 .291
bearing port
1.019-0.995
R. crank shaft
Oul. dio. 29.983-29.993 29.95 less
Exchange
bearing part 1.1 80-1.180 1.179
Crank shaft camp. Max. swing
0.03 less
0.1 mo re Rectify
0.001
0.003
R,
Cro nk shoft
key Width
4.0 - 4.03
4.10 more Re ctify
or
groove
0.157-0.158
0.161 exchange
Thick ness 4.0 -4.1 (Referential value!
0.157-0. 16 1
Length be
pr ocessed {Referen tial valuel
with one culle r
l.
cronk shaft pin,
In . dia. 25.907 - 25.921
pressed po rt 1.019 - 1.020
l.
cro nk shaft O ut. dia. 30002 - 30.0 15 25.95 less
Excha nge
pre ssed port
1.1 81 - 1. 187 1.021
*
30.004 - 30.009
•
29.97 less
1.1 81 - 1.18 1 1.179
Primary drive sprocket
No. of tooth
15
Measuring
39. 11-39.21
38.9 less Exchange
bo ttom dia. 1.539 - 1.543 1.531
2 1