Repairing and aligning conrod - RA03001193130X(03-3130)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Operation no. of operation texts and work units or standard texts and flat rates
03-6111
Engine 119.96
Engine 119.97/98
DATA
| Engine | 119.96 | 119.97/98 | |||
|---|---|---|---|---|---|
| Centre of conrod bearing bore to center of conrod bush bore (L) | 154.550 | 149.050 | |||
| 154.450 | 148.950 | ||||
| Width of conrod at conrod bearing bore (B) | 24.890 | ||||
| 24.857 | |||||
| Width of conrod at conrod bush bore (b) | 28.000 | 22.100 | |||
| 27.900 | 21.900 | ||||
| Basic bore for conrod bearing shells (D) | 51.619 | ||||
| 51.600 | |||||
| Basic bore for conrod bush (d) | 29.021 | 27.210 | |||
| 29.000 | 27.000 | ||||
| Conrod bush ID (d1) | 26.013 | 24.013 | |||
| 26.007 | 24.007 | ||||
| Piston pin play in conrod bush | 0.007 | 0.007 | |||
| 0.013 | 0.018 | ||||
| Peak-to-valley height of conrod bush on inside | 0.004 | 0.005 | |||
| Engine | 119.96 | 119.97 | |||
| Permissible twist of conrod bearing bore relative to conrod bush bore | 0.15 | ||||
| Permissible variation of parallelism of conrod bearing bore to conrod bush bore | 0.07 | ||||
| Permissible variation of conrod bearing bore from roughness | 0.01 | ||||
| Permissible difference in weight of complete conrod within an engine | 4 g |
Special tool
COMMERCIALLY AVAILABLE TOOLS
| Conrod tester | e.g. | Model BC 501 KWT D-6057 Dietzenbach |
| Conrod straightening device | e.g. | Model BC 503 KWT D-6057 Dietzenbach |
| Quick-callipers for internal measurements dia. 20 - 40 mm dia. 40 - 60 mm |
||
| Micrometer 0 - 25 mm 50 - 75 mm |
NOTE:
Conrods which have been overheated as a result of the bearing damage (blue discoloring) must not be re-used.
Conrod and conrod caps are marked together. The conrod stem must not have any transverse scoring and notches.
Conrods are supplied with machined conrod bush as a replacement part.
Conrod and crankshafts with different thrust collar dia. may be installed together when performing repairs.
Engine 119.97: The conrod and the conrod cap are fixed together with fit sleeves.
Pay attention to difference in weight when replacing the conrod.
Repairing
- Check conrod bolts, replace if necessary (03-3100) .
- Engine 119.96: Examine bores for conrod bolts. Fit conrod cap onto a conrod bolt. If the conrod cap moves down as the result of its own weight, the conrod must be replaced.
- Install conrod bearing caps. Oil thread and bolt head contact surface for this step and tighten to 40 Nm.
- Measure conrod bearing basic bore. If the basic bore exceeds the value of 51.619 mm or is conical, dress bearing cover at its contact surface on a dressing plate up to max. 0.02 mm.
- Press in new conrod bush so that the oil bores are aligned (arrows).
Insertion pressure 2500 N.
- Turn or ream conrod bush.
- Dress side contact surfaces of conrod on the dressing plate.
Aligning
- Align conrod with conrod tester.
- Align conrod bearing bore to conrod bush bore (parallelism).
- Examine twist of conrod bearing bore to conrod bush bore and correct if necessary.