Connecting Rod Bearing Replacement

Connecting Rod Bearing Replacement

Connecting Rod Bearing Clearance Inspection

1. Remove the oil pump Overhaul.

2. Remove the baffle plate Crankshaft And Piston Removal.

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

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

5. Place plastigage across the rod journal.

6. Reinstall the bearing half and the cap, then tighten the bolts to 41 Nm (4.2 kg-m, 30 lb-ft) +120 °

NOTE:

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

7. Remove the rod cap and the bearing half, and measure the widest part of the plastigage.









8. If the plastigage measures too wide or too narrow, remove the cap, and 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.

9. 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 the clearance 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.

Connecting Rod Bearing Selection

Each connecting rod fails into one of four 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 is 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 1, 2, 3, or 4/l, ll, lll, or llll in any engine.





Inspect the connecting rod for cracks and heat damage.

Big End Bore Code Locations

Numbers or bars have been stamped on the side of each connecting rod as a code for the size of the big end. Use them, and the letters or bars stamped on the crank (codes for rod journal size), to choose the correct bearings. If the codes are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.










Connecting Rod Journal Code Location