Honda C72 Shop Manual page 6

B. Crank Shaft (Piston , Connecting Rod) It e m
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Standard
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Repoicing Umi'
!
Remarks
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Piston pin
&
piston Clearance
0 - 0.012
0.05 more
In cold,
push in
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0 - 0.0004 0.00196 softly by
fingers
Connecting
cod
In. dio. 15.016 - 15.043 15.08 more
It e m
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Standard
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R .. l ·
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Remarks
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epalflng Imll
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:
Piston
Top diameter 53.55 - 53.60 53.5 le ss The progressive
small end 0.5911 - 0.5922 0.5936
Con. rod small ent) & Clearance 0.0 16 - 0.049
I 0.08
more
piston pin 0.0006 - 0.00 19 0.0031
2.108-2.110 2.106
direction of the
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Max. dio.
+0
lower ports of skirt
,
54_0.02=D
53.9 less
2.112
Con. rod small
end
Swing 3.0 morc
Max. amplitude
10
I 0.118
axial direction of
Lower end of can. rod Axial cl eara nce 0.07 -0.33
0.5 more
cronk pin
0.0027 -0.012
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0.0196
Diagonal clearance
0.006 -0.016
0.05
mOre
I Out of round
D-10. 14-
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0. 161=d
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D-IO.005 -
0.0061=d
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Piston
&
cylinder Min. clearan
ce
0 0.1
more
Big end · small end of
Amount of parallel
within 0.02
over
0.1
A, leng,h of
can. rod
0.00078 0.0039
100 mm 13.93 inl
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0.0039
,
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./
Pist on pin
Dia.
15.0 -15.0006
15.05 more
!
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0.59 - 0.5907 0.5925
Distortion within 0.02
ove r
0.1
At length of
0.00078
0.0039
100 mm 13.93 inl
Pisto n over size Over size 0.25 3
category of
0.0098
0.25 1000981
Taper
D-0.08d-0.08
ove r size
Boronser weight Out. dio. 24.99-25.00
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24.95 or Ie"
crankpin
0.9838 -0.9842
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0.9822
R.
L.
crank shaft Dio. of shaft
30.82-30.86 30.6 or less
1.213-1.215 1.204
Cronk shof t bearing Axial clearance 0.005
Over 0.1
Cen ter bearing
0.00019 0.0039
D-0.0031 d-0.003
Top · 2nd ri ng Thickness 2.4 -2.6
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2.3 less
0.094 -0.1 02
0.0905
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Width 1.780-1.795
I 1.7 less
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0 .0700-0.0778
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0.0669
Tension 0.75-1.05kg !topl
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0.6 kg le ss
Tangential tension
Radial
clearance
0.014 - 0.016
Over
0.05
0.0005 -0.0006 0.0019
Crank shaft
Max. swing 0.03 less
over
0 1
In case of supporting
combina tion
,
center bea ring . th e
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0.0011
0.0039
Cam chain
Overall
length 723.0 -723.8
Ove r 728
swing of both ends
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0.70- 1.00kg 12ndl
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1.653 - 2.315 Ib 1.3230 less
In case of binding
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1.543-2.205 Ib I
i
End gop
0.15 - 0.35
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0.8 more
,
28.46-28.49 28.66
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0.0059 - 0.0 137
I 0.314
Top· 2nd
ring
&
ring
Clearan ce
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0.01-0.04 0.1
more
groove 0.0003- 0.000 15
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0.0039 C. Cam· Timing and Valve Mechanism
Oil ri ng Thickness
2.4-2.6 2.0 less
0.0944 - 0.1 023 0.0787
Width
2.780 - 2.795 2.7 less
tIe m
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Standard
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Repoicing limi'
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Remarks
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0.1094-0.1100
0.10629
Tension
0.7 - 0.9 kg 0.5 less
Tangential tensi on
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1.5435 -1.9845 Ib 1.I025 1b
Ex.
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In. valve guide In. dia.
7.0 -7 .01
over 7.05
0.2755 - 0.2759 0.2775
Ex.
valve Overall length
,
88 .65 - 88.85 88.2 or less
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End gop 0.1-0.3
0.8 more
In case of binding
0.0039 - 0.0118 0.031 4
3.490 - 3.498 3.472
Out. dio.
of
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6.97 - 6.98
stem 6.95 or less
Oil ring
&
ring groove Clearan ce 0.01-0.04 0.1
more I
,
0.2744 - 0.2748
,
0.273
0.0003 - 000 15 00039
Thickness
of head
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1.0
0.5 or less I
Piston over size
Ove r size
0.25
3
ca tegory of
0.03937
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0.001968
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0.0098
0.25 10 .00981
Piston pin Out. dio. 14.994-15.0 14.95 less
over size
0.5903 - 0.5905 0.5885
Total length 45.5-45.7
1.7913-1.7992
In. valve Overall length 89.18 - 89.38
88.7 or less
3.511 - 3.5 18
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3.492
Out. d io. of stem
6.97 -6 .98
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6.95 or less
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0.2744 - 0.2748 0.273
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2