Connecting Rod Bearing: Service and Repair

NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

Inspection
1. Remove pistons. Service and Repair
2. Examining connecting rods for blue discoloration, cross scoring and notches
- Conrod with blue discoloration (resulting from bearing damage), with cross scoring and notches must not be re-used

CAUTION: When Replacing conrod, balance of conrod set must be within weight of 4 grams.





3. Bolt conrod bearing cap to connecting rod as follows:

NOTE: Connecting rod and conrod bearing caps are marked together and fixed in position with two dowel sleeves.





- Tighten conrod bolts to initial torque of: 45 Nm
- Tighten conrod bolts: an additional 90°
4. Measure conrod basic bore (D1), refer to the specifications below.

NOTE: If basic bore is conical or if the diameter is greater than the maximum value, hone off the conrod bearing cap at in contact surface by not more 0.02 mm.

5. Examine inner diameter (d) of conrod bushes, refer to specifications below.
- If wear excessive, press in new conrod bush as follows:





a. Press out conrod bush.
b. Press in new conrod bush
The oil bores must be aligned (arrow)
c. Skim conrod bush, then ream
d. Dress side surfaces of conrod on a dressing plate
6. Using a suitable conrod aligning tool, check alignment and refer to specifications below.

NOTE: If not to specifications, align conrod

Dimensional Specifications
Distance from center of conrod bearing bore to center of toured bush bore (L): 149 mm
Width of conrod at conrod bearing bore (B) and conrod bush bore (b): 21.95 - 22.00 mm
Conrod bearing shell basic bore (D1) diameter: 51.60 - 51.62
Permissible out-of-roundness and conicity of basic bore:0.02
Permissible twist of conrod bearing bore relative to conrod bush bore over length of 100 mm: 0.10 mm
Permissible difference in axial parallelism of conrod bearing bore to conrod bush bore ever length of 100 mm: 0.05 mm
Permissible difference in weight of complete conrod of an engine: 4 grams
Conrod bush inner diameter (d): 22.007 - 22.013 mm
Conrod bush basic bore diameter (d1): 24.50 - 24.52 mm
Piston pin play in conrod bush: 0.007 - 0.018 mm
Surface finish peak-to-valley height (Rz) of conrod bush on inside: 5

Tightening Specifications
Conrod bolt (stretch shank)
- Initial Torque: 45 Nm
- Turn an additional: 90°