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Cylinder block

The cylinder block is cast from special cast iron, and is integrally formed with the cylinders.

Characteristic	Value
The height of the cylinder, mm
M 102
Rated	292,45-292,55
maximum	292.35
M 110
Rated	213,1-213,2
maximum	212.8
M 115
Rated	242,8--242,9
maximum	242.5
M 123
Rated	242,8-242,9
maximum	242.5
Warping the mating surfaces of the unit, mm
top	0.03
lower	0.04
Rated roundness and taper of cylinder bores, no more, mm
For models manufactured before 1980	0,013
For models manufactured after 1980	0,007
The maximum permissible value of the operation (if worn)	0.05
Permissible misalignment generator, mm	0.05
The surface roughness, micrometers	0.002-0.004
Grid scratches on honing	50 ?� ?� 10 ?�
The height from the bottom of the piston at top dead center to the plane of coupling of the head unit
maximum	0.60-0.65
minimal	0.60-0.65

The cylinder diameter *

Engine model	Bore, mm
	nominal	1st repair	2nd repair	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 values caused by model year release.

Hole diameter crankshaft bearing

Engine model
M 115,938	M 102,920, 102,939 M	M 102,980, M 102.982	M 115,954
74,50-74,52	62,500-62,519		74,50-74,52
M 123,920, 123,921 M	M 110,923	M 110,984, 110,988 M
67,00-67,02	67,00-67,02