Reconditioning and squaring connecting rod

03—313 Reconditioning and squaring connecting rod

Data

Center of connecting rod bearing bore to center of connecting rod bushing bore

148.95 149.05

Width of connecting rod at connecting rod bearing bore

31.84 31.88

Width of connecting rod at connecting rod bushing bore

27.90 28.10

Basic bore for connecting rod bearing shells

55.60 55.62

standard dimension

31.000 31.025

Basic bore for connecting rod bushing

repair stage

31.500 31.525

standard dimension

31.060 31.100

Connecting rod bushing OD

repair stage

31.560 31.600

Connecting rod bushing ID

28.018 28.024

Roughness of connecting rod bushing, inside

0.004

Permissible offset of connecting rod bearing bore in relation to connecting rod bushing bore with reference to a length of 100 mm

0.1

Permissible deviation of parallel alignment of axes: Connecting rod bearing bore in relation to connecting rod bushing bore with reference to a length of 100 mm

0.045

Permissible difference in weight of complete connecting rods within one engine

5g

initial torque

40-50 Nm

Connecting rod nuts

angle of rotation torque 90—100°

03.8-313/1 F 2

Angle of rotation tool

116 589 01 13 00

Connecting rod straightening tool

e.g. made by Hahn & Kolb, D-7000 Stuttgart model BC 503

Connecting rod bearing bore (A) and connecting rod bushing bore (B) are of different width.

Do not install these connecting rods on the other diesel engines.

It is also not possible to install the connecting rods of the other diesel engines in this engine.

The connecting rods are subdivided into weight classes.

Colored dots on shank serve to identify the individual weight classes.

Install only connecting rods with the same color dots in engine.

Connecting rods which are overheated as a result of bearing damage (blue discoloration) should no longer be used.

Connecting rod and connecting rod bearing cap are marked together. The connecting rod shank should have no transverse score marks and notches.

Connecting rods with machined connecting rod bushing are available as spare parts.

03.8-313/2

In the period from May to October 1980, connecting rod bearing shells of a second manufacturer (Karl Schmidt) were installed. Standard shells from Glyco.

1 Check connecting rod bolts and renew, if required (03-310).

2 Check bores for connecting rod bolts.

Mount connecting rod bearing cap on a connecting rod bolt. If the connecting rod bearing cap is moving downwards under its own weight, the connecting rod must be replaced.

3   Mount connecting rod bearing caps, lubricate connecting rod nuts and tighten to 40—50 Nm preload and 90—100° angle of rotation torque.

4   Measure connecting rod bearing basic bore. If basic bore exceeds a specified value of 55.62 mm or is conical in shape, refinish bearing cap supporting sur­face on a face plate up to max. 0.02 mm.

03.8-313/3 F2

5   Press-in new connecting rod bushing in such a manner that the oil bores are in alignment.

Pressing-in pressure 2500 N.

6   Machine or ream connecting rod bushing.

7    Refinish lateral contact surfaces of connecting rod on a face plate.

8   Square connecting rod by means of connecting rod tester.

9   Align connecting rod bearing bore in relation to connecting rod bushing bore (parallel alignment).

10 Check offset of connecting rod bearing bore in relation to connecting rod bushing bore and make corrections, if required.

03.8-313/4 F2