Connecting Rod Bearing Replacement

Connecting Rod Bearing Replacement

Connecting Rod Bearing Clearance Inspection

1. Remove the connecting rod cap and the bearing half. Crankshaft and Piston Removal

2. Clean the crankshaft rod journal and the bearing half with a clean shop towel.

3. Place a Plastigage across the rod journal.

4. Reinstall the bearing half and the cap, and torque the bolt to 25 N-m (2.5 kgf-m, 18 lbf-ft) + 90 °.
NOTE:

- Do not rotate the crankshaft during inspection.

- Apply new engine oil to the bolt threads and flanges.

5. Remove the rod cap and the bearing half, and measure the widest part of the Plastigage.





6. If the Plastigage measures too wide or too narrow, remove the upper half of the bearing, install a new, complete bearing with the same color code(s), and recheck the clearance. Do not file, shim, or scrape the bearings or the caps to adjust clearance.

7. If the Plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below that one), and check clearance again. If the proper clearance cannot be obtained by using the appropriate larger or smaller bearing, replace the crankshaft and start over.






Connecting Rod Bearing Selection

1. Inspect each connecting rod for cracks and heat damage.

Connecting Rod Big End Bore Code Locations

2. Each connecting rod has a tolerance range from 0 to 0.024 mm (0.0009 in.), in 0.006 mm (0.0002 in.) increments, depending on the size of its big end bore. It's then stamped with a number or bar (1, 2, 3 or 4/l, ll, lll, or llll) indicating the range. You may find any combination of numbers or bars in any engine, (half the number or bar is stamped on the bearing cap, the other half on the rod).
If you cannot read the code because of an accumulation of dirt and dust, do not scrub it with a wire brush or scraper. Clean it only with solvent or detergent.






Connecting Rod Journal Code Location

3. The connecting rod journal codes are stamped on the No. 1 web.

Connecting Rod Journal Code Location (Letters or Bars)





4. Use the big end bore codes and the rod journal codes to select appropriate replacement bearings from the following table.
NOTE: Color code is on the edge of the bearing.