Crankshaft Main Bearing Replacement

Crankshaft Main Bearing Replacement

Main Bearing Clearance Inspection

1. To check the main bearing-to-journal oil clearance, remove the lower block and the bearing halves Crankshaft And Piston Removal.

2. Clean each main journal and the bearing half with a clean shop towel.

3. Place one strip of plastigage across each main journal.

4. Reinstall the bearings and the lower block, then torque the bolts to 29 Nm (3.0 kg-m, 22 lb-ft).

NOTE:

- Apply new engine oil to the bolt threads and flanges.
- Do not rotate the crankshaft during inspection.





5. Tighten the bearing cap bolts an additional 48 °.

6. Remove the lower block and the bearings again, and measure the widest part of the plastigage.













7. If the plastigage measures too wide or too narrow, remove the crankshaft, and remove the upper half of the bearing. Install a new, complete bearing with the appropriate color code(s), and recheck the clearance. Do not file, shim, or scrape the bearings or the caps to adjust clearance.

8. If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below the current one), and check again. If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over Crankshaft And Piston Removal.

Main Bearing Selection

Block Bore Code Location

1. Numbers, letters, or bars have been stamped on either side of the lower block end as a code for the size of each of the five main journal bores. Write down the block bore codes.
If you cannot read the codes because of accumulated dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.






Main Journal Code Location

2. The main journal codes are stamped on the crankshaft in either location.










3. Use the block bore codes and the main journal codes to select the appropriate replacement bearings from the following table.

NOTE:

- Color code is on the edge of the bearing.
- When using bearing halves of different colors, it does not matter which color is used in the top or bottom.

K24Z2 engine





K24Z3 engine