Crankshaft assembly,  OM617

Checking, renewing and tightening connecting rod bolts



03—310 Checking, renewing and tightening connecting rod bolts


Dimensions of connecting rod bolt



Part no. Thread dia.
Necked-down dia. when new (Fig. item 1)
Min. necked-down dia. c
615 038 02 71 M10x1
Installation pressure of connecting rod bolt


45000 N
Tightening of connecting rod nuts



Initial tightening torque


40-50 Nm
Angle of rotation torque




Special tool


Angle of rotation tool
om617 - 0084-1.jpg
116 589 01 13 00


Self-made tool


Steel plate
refer to Fig. item 3




1 Measure minimum necked-down dia. prior to re-use.
om617 - 0084-2.jpg
03.8-310/1 F 2




Note: When the minimum necked-down dia. of 8.0 mm has been attained or is less than 7.2 mm, renew connecting rod bolt.
Knock-out connecting rod bolt only for replacement.
om617 - 0085-1.jpg



om617 - 0085-2.jpg

2    Knock-out connecting rod bolts.
3   Press new connecting rod bolts into connecting rod at approx. 45 000 N or knock-in with a hammer and mandrel.
When knocking-in or pressing-in connecting rod bolts, place connecting rod on a ground steel plate.


Hole spacing a = 67 mm Bore               b= 11 mm
om617 - 0085-3.jpg
4    Lubricate nuts and threaded support.
5   Tighten connecting rod nuts to 40—50 Nm initial torque and 90—100° angle of rotation torque.
Tighten connecting rod bolts knocked-in with a hammer for the first time at 60—70 Nm initial torque and 90—100° angle of rotation torque.


This specification must be strictly observed, since otherwise the connecting rod nuts may become loose.
Note: If no angle of rotation tool is available, the connecting rod nuts can also be tightened by means of a normal socket wrench with tommy bar in one step by an angle of 90—100°. This angle should be estimated as accurately as possible. To eliminate angle of rotation errors, do not use torque wrench for tightening according to angles of rotation.


03.8-310/2 F 2