Connecting Rod Bearing: Service and Repair
Connecting Rod BearingConnecting Rod ID:
1. Locate the bearing upper shell into the connecting rod.
2. Locate the connecting rod and bearing onto the applicable crankshaft journal, noting that the domed shape boss on the connecting rod must face towards the front of the engine on the right hand bank of cylinders and towards the rear on the left hand bank.
3. When both connecting rods are fitted, the bosses will face inwards towards each other.
Plastigauge On Connecting Rod Journal:
4. Place a piece of Plastigauge (P61) across the center of the lower half of the crankshaft journal.
5. Locate the bearing lower shell into the connecting rod cap.
6. Locate the cap and shell onto the connecting rod. Note that the rib on the edge of the cap must be on the same side as the domed shape boss on the connecting rod.
7. Secure the connecting rod cap. Tighten to 47-54 Nm (35-40 ft lb)
8. Do not rotate the crankshaft or connecting rod while the Plastigauge is in use.
9. Remove the connecting rod cap and shell.
10. Using the scale printed on the Plastigauge packet, measure the flattened Plastigauge at its widest point.
11. The graduation that most closely corresponds to the width of the Plastigauge indicates the bearing clearance.
12. The correct bearing clearance with new or overhauled components is 0.015 to 0.055 mm (0.0006 to 0.0022 in).
13. If a bearing has been in service, it is advisable to fit a new bearing if the clearance exceeds 0.08 mm (0.003 in).
14. If a new bearing is being fitted, use selective assembly to obtain the correct clearance.
15. Wipe off the Plastigauge with an oily rag. DO NOT scrape it off.
NOTE: It is important that the connecting rods, caps and bearing shells be retained in sets, and in the correct sequence.