Connecting Rod Bearing: Service and Repair

REPLACING ALL CONROD BEARINGS

(Piston removed)

Caution! Pay attention to crankshaft grinding stages for proper bearing shells.




Install new conrod bearing shells.

For each conrod, install red and blue bearing shell (irrespective of color coding on conrod shaft).

Installing pistons. Service and Repair




Check connecting-rod bearing clearance:

Piston in BDC position.

Fit special tool 00 2 590 (Plastigage Type PG 1) to the oil-free crankshaft.

Place bearing caps in position, making sure that matching numbers are paired.




Caution! Do not turn the connecting rods or crankshaft.

Use the old connecting-rod bolts to check connecting-rod clearance.

Tighten down conrod screws with special tool 00 9 120 or 11 2 110, respectively.

Tightening torque, Application torque = 5 Nm
Jointing torque = 20 Nm
Torque angle = 80°




Removing bearing cover and reading off bearing clearance on width of pinched plastic thread with the help of the measuring scale.

Remove plastic thread.




Summary:
Colour code / shaft diameter / bearing strength
Rt Red
BI Blue
1. Crankpin
2. Bearing clearance
3. Bearing shells: red or blue
4. Conrod