Crankcase and cylinder head,  OM617

Measuring, boring and honing cylinder bores



01—110 Measuring, boring and honing cylinder bores


Coordination piston — cylinder


Version l)
Group no.
Piston dia.
Cylinder dia.
0 1 2
90.845 – 90.855 above 90.855 – 90.865 above 90.865-90.875
90.898 – 90.908 above 90.908-90.918 above 90.918-90.928


Cylinder bore


Max. wear limit in forward or transverse direction


when new


Permissible out-of-true and conicity


wear limit


Permissible deviation vertically in relation to crankshaft center line, with reference to cylinder height


Permissible roughness


Permissible waviness
50 % of roughness


Honing angle


Chamfer of cylinder bores
refer to Fig.


1 These engines have no repair steps.




In addition of a visual checkup, in particular in the event of complaints about “high oil consumption” measuring of cylinder bores is unavoidable.


For this purpose, measure the clean cylinder bores with internal measuring instrument at measuring points, 1, 2 and 3 in longitudinal direction A (piston pin center line) and in transverse direction B.
With piston installed, the measuring point 3 is barely above piston, at BDC.
om617 - 0029-1.jpg
a Upper reversing point of 1st piston ring
b BDC of piston
c Lower reversing point of oil scraper ring


01.8-110/1 F2




Chamfer cylinder bores after boring.
For honing, the material allowance should not exceed 0.03 mm.
om617 - 0030-1.jpg


01.8-110/2 F2