Dnepr MT9 - Nominal Sizes, Tolerances and Interferences in the Engine and Clutch

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Table 3
Nominal Sizes, Tolerances and Interferences in the Basic Matil)g Members of the Engine and Clutch
Number ancl d es·
niplio n ni compo-
nertl nart ( shaft)
M.T801237
piston
(diamet er
of
skirt)
MT801238
riston p!n (outsi·
de
diam eter)
Nomina l size and
tolerancE". mm
78
0.02
- O.OG
77.95
77.95-7794
7796
7796 - 77 .95
77.97
77.97- 77.06
21_o.QI
Whil e
21.0000 20.9975
Black
20.9975-20 .9950
Red
20.9950-20.9925
I
Number and des-
Nomina l ·size and
cription of
mating
toleran ce , mm
member (ope ni ng)
I
MT801301
78+0.lH
cy li nder
I
Si ze Groups
I
78.0 1 -78.00
2
78.02- 78.0 l
3
7 8. 03- 78.f l::!
MT801238 1
21 _:: g:g?~
piston (an ope n-
ing in the boss)
Size Groups
White
20.9930- 20.9905
Black
20 9905-20.9880
Red
20.9880-20.9855
To lerance zone, mm
clearance
mini- I max i-
mum
mum
0.051 0.07
0.05 0.07
0.05
I 0.07
interference
mini· I maxi·
mum mum
I
I
0.0043 I o 0005
0.0045 10.0095
0.0045 0. 0095
Rrm :1 rks
E ll ipticity and co-
nicity
dia.
78+0.04
within 0.0 15
The group inde x
is
stampe d on the
piston head and
on the lower e
nd
face of the cylin-
der
Ellipticity
and co-
nicity of the pin
\v ithin 0.0025
The
co lour index
of
the group is
ma rked on one of
the
internal e nd
sid es of the pins
and on one of the