Checking, renewing and tightening connecting rod bolts

Angle of rotation tool

116 589 01 13 00

Steel plate

refer to Fig. item 3

1 Measure minimum necked-down dia. prior to re-use.

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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.

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

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.

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