Bearing Selection

Connecting Rod Bearing Selection





1. The connecting-rod bearings are of the precision insert type. The connecting-rod bearings are available in standard size and in 0.25 mm (0.0098 inch) undersize.

Important: If crankshaft bearing failure is because of abnormal wear, investigate the cause. Inspect the crankshaft or the connecting-rod bearing bores.

2. Inspect the connecting-rod bearing bores or the crankshaft main bearing bores using the following procedure:
2.1. Tighten the bearing cap to specification.
2.2. Measure the bearing bore for taper and for an out of round condition.
2.3. A taper or an out of round condition should not exist.

Important: The crankshaft and the main bearing caps must be installed and correctly torqued before measuring the connecting rod clearances.





3. Starting with the number one connecting rod, remove the connecting rod cap nuts.
4. Carefully remove the connecting-rod bearing cap.





5. Lay a piece of gauging plastic across the number one connecting rod journal of the crankshaft.
6. Carefully place the connecting-rod cap onto the connecting rod.

Important: Do not turn the crankshaft while measuring the bearing clearance.

7. Install the two connecting-rod bearing cap nuts.
Tighten the connecting-rod bearing cap bolts to 35 Nm (26 ft. lbs.).
8. After reaching the proper torque, remove the two connecting-rod bearing cap nuts of the crankshaft.
9. Carefully remove the connecting-rod bearing cap from the connecting rod.





10. Measure the gauging plastic (1) at the widest point.
^ Standard Oil Clearance: 0.020 - 0.050 mm (0.0008 - 0.0019 inch)
^ Maximum Oil Clearance: 0.080 mm (0.0031 inch)





11. If bearing replacement is necessary, determine if a standard bearing or an undersized bearing is needed. The undersized bearing is identifiable by a stamping on the back side of the bearing. Refer to Specifications for the bearing selection table.