2.1.3. Block of cylinders

The block of cylinders is cast from special cast iron and makes a single whole with cylinders.

Characteristic

Value

Height of the block of cylinders, mm

M 102

  • nominal

292,45 — 292,55

  • maximum

292,35

M 110

  • nominal

213,1 — 213,2

  • maximum

212,8

M 115

  • nominal

242,8 —-242,9

  • maximum

242,5

M 123

  • nominal

242,8 — 242,9

  • maximum

242,5

Buckling of the interfaced surfaces of the block, mm

  • top

0,03

  • lower

0,04

Nominal ovality and conicity of mirrors of cylinders, no more, than a mm

  • for release models till 1980.

0,013

  • for release models after 1980.

0,007

The most admissible size in operation (at wear)

0,05

Admissible not straightforwardness forming, mm

0,05

Roughness of a surface, micron

0,002 — 0,004

Grid рисок from a honingovaniye

50 ° ±10 °

Height from the piston bottom in the top dead point to the plane of interface to a block head

  • maximum

0,60 — 0,65

  • minimum

0,60 — 0,65

Diameters of cylinders *
Engine model
Diameter of cylinders, mm
nominal
The 1st repair
The 2nd repair
The 3rd repair

M 102.920 (939)

  • class 1

88,998 — 89,008

89,498 — 89,508

89,998 — 90,008

  • class 2

89,008 — 89,018

89,508 — 89,518

90,008 — 90,018

  • class 3

89,018 — 89,028

89,518 — 89,528

90,018 — 90,028

M 115.938

  • class 1

87,000 — 87,022

87,500 — 87,522

88,000 — 88,022

88,500 — 88,522

  • class 2

87,010 — 87,032

87,510 — 87,532

88,010 — 88,032

88,510 — 88,532

  • class 3

87,020 — 87,042

87,520 — 87,542

88,020 — 88,042

88,520 — 88,542

M 102.980 (982)

  • class 1

95,498 — 95,508

95,998 — 96,008

96,498 — 96,508

  • class 2

95,508 — 95,518

96,008 — 96,018

96,508 — 96,518

  • class 3

95,518 — 95,528

96,018 — 96,028

96,518 — 96,528

M 110.923 (984,988)

  • class 1

86,000 — 86,022

86,500 — 86,522

87,000 — 87,022

  • class 2

86,010 — 86,032

86,510 — 86,532

87,010 — 87,032

  • class 3

86,020 — 86,042

86,520 — 86,542

87,020 — 87,042

M 115.954

  • class 1

93,750 — 93,772

94,150 — 94,172

94,550 — 94,572

  • class 2

93,760 — 93,782

94,160 — 94,182

94,560 — 94,582

  • class 3

93,770 — 93,792

94,170 — 94,192

94,570 — 94,592

M 110.923 (984,988)

  • class 1

86,000 — 86,022

86,500 — 86,522

87,000 — 87,022

  • class 2

86,010 — 86,032

86,510 — 86,532

87,010 — 87,032

  • class 3

86,020 — 86,042

86,520 — 86,542

87,020 — 87,042

* The difference of sizes is caused model year of release.

Diameter of a nest of radical bearings of a bent shaft
Engine model
M 115.938
M 102.920, M 102.939
M 102.980, M 102.982
M 115.954

74,50 — 74,52

62,500 — 62,519

74,50 — 74,52

M 123.920, M 123.921
M 110.923
M 110.984, M 110.988

67,00 — 67,02

67,00 — 67,02