Repairing connecting rod

AR03.10-P-6111A

Repairing connecting rod

28.7.94

24.9.01

Value modified from 45 Nm to 5 Nm

Value modified in BA03.10-P-1001-01H on engine 111
Stage 1

*BA03.10-P-1001-01H

 

Remove, Install

1

Remove pistons

AR03.10-P-7021A



Inspect

2

Check conrods for blue discoloration, cross scores and notches

Connecting rods with blue discoloration (caused by bearing damage), with cross scores and notches must no longer be used 

Replace conrod and balance out different conrod weights.
 Illustration information 

*BE03.10-P-1005-01A

Conrod as-built configuration description

GF03.10-P-0800A

3

Screw conrod bearing cap to conrod

Conrod and conrod bearing caps are marked together and located with two dowel sleeves.

Tighten conrod bolts to initial tightening torque 

Tightening conrod screws

AR03.10-P-6111-02A

4

Measure conrod bearing basic bore, repair

If basic bore is conical or if diameter is greater than maximum value, dress conrod bearing cap at its contact surface by max. 0.02 mm.

*BE03.10-P-1002-01A

 Illustration information

GF03.10-P-0800A



*001589532100



*WH58.30-Z-1012-12A



*WH58.30-Z-1001-12A

5

Check conrod bush inside diameter

*BE03.10-P-1006-01A

 Illustration information
in the case of increased wear 

GF03.10-P-0800A

Press-fitting new conrod bush

AR03.10-P-6111-03A



*001589532100



*WH58.30-Z-1012-12A



*WH58.30-Z-1001-12A

6

Align conrod



*WH58.30-Z-1008-05A



*WH58.30-Z-1009-05A

Number

Designation

Engine 111.920/
921/940/941/
942/943/944/
945/946/947

Engine 111.960/
961/970/973/
974/975/977

BE03.10-P-1001-01A

Dimension

Distance from middle of conrod bearing bore up to conrod bush bore (L)

mm

154

149

Width of conrod at conrod bearing bore (B) and at conrod bush bore (b)

mm

21,95-22,00

21,95-22,00

Fig. see

AR03.10-P-6111A

AR03.10-P-6111A

BE03.10-P-1002-01A

Conrod bearing shell basic bore (D1) 

mm

51,60-51,62

51,60-51,62

Permissible out-of-roundness and conicity of basic bore

mm

0,02

0,02

Fig. see

AR03.10-P-6111A

AR03.10-P-6111A

BE03.10-P-1003-01A

Permissible twist of conrod bearing bore to conrod bush bore over a length of 100 mm

mm

0,1

0,1

BE03.10-P-1004-01A

Permissible variation of axial parallelism of conrod bearing bore to conrod bush bore over a length of 100 mm

mm

0,05

0,05

BE03.10-P-1005-01A

permissible difference in weight of complete conrod of an engine

g

4

4

BE03.10-P-1006-01A

Conrod bush inner  (d)

mm

22,007-22,013

22,007-22,013

Fig. see

AR03.10-P-6111A

AR03.10-P-6111A

BE03.10-P-1007-01A

Conrod bush basic bore  (d1)

mm

24,50-24,52

24,50-24,52

Fig. see

AR03.10-P-6111A

AR03.10-P-6111A

BE03.10-P-1008-01A

Piston pin play in conrod bush

mm

0,007-0,018

0,007-0,018

BE03.10-P-1009-01A

Peak-to-valley height (Rz) of inner conrod bush

μm

5

5

Number

Designation

Engine 111

BA03.10-P-1001-01H

Conrod screw (stretch shank)

1st stage

NM

5

2nd stage

NM

25

Step 3

°

90

Number

Designation

WH58.30-Z-1008-05A

Connecting rod tester

WH58.30-Z-1009-05A

Conrod straightening equipment

WH58.30-Z-1001-12A

Quick calipers for internal measurements

WH58.30-Z-1012-12A

Setting gage for micrometer