SHAFT AS-STUB 1298406 - Caterpillar

This procedure must only be used to remove and install the main bearing shells with the crankshaft in position.The removal procedure and the installation procedure must be completed for each pair of main bearing shells before the next pair of main bearing shells are removed.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that the main bearing shells are clean and free from wear and damage. If necessary, replace the main bearing shells.
Clean the journals of the crankshaft. Inspect the journals of the crankshaft for damage. If necessary, replace the crankshaft or recondition the crankshaft.
Illustration 6 g02447420
Lubricate the crankshaft journal and upper main bearing shell (8) with clean engine oil. Slide upper main bearing shell (8) into position between the crankshaft journal and the cylinder block. Ensure that the locating tab for the upper main bearing shell is correctly seated in the slot in the cylinder block. Note: The upper main bearing shell has a groove and two oil holes.
Illustration 7 g02447419
For number No. 3 main bearing, ensure that two thrust washers (7) are clean and free from wear and damage. If necessary, replace the thrust washers. Lubricate thrust washers (7) with clean engine oil. Slide thrust washers (4) into position between the crankshaft and the cylinder block. Ensure that the locating tab is correctly seated in the cylinder block.
Illustration 8 g02447418
Install lower main bearing shell (3) into main bearing cap (2). Ensure that the locating tab for the lower main bearing shell is correctly seated into the slot in the bearing cap. Ensure that the dowel (6) is correctly located. Note: The lower main bearing shell is a plain bearing that has no oil holes.
Illustration 9 g02447416
Lubricate the crankshaft journal and the lower main bearing shell with clean engine oil. Install main bearing cap (4) to the cylinder block. Note: Ensure the correct orientation of the main bearing cap. The locating tab for the upper and the lower bearing should be on the same side of the engine.
Lubricate the threads of bolts (3) with clean engine oil. Lubricate the underside of the heads of bolts (3) with clean engine oil.
Install bolts (3) to main bearing cap (4). Evenly tighten the bolts in order to pull cap (3) into position. Ensure that the cap is correctly seated. Note: Do not tap the main bearing cap into position as the bearing shell may be dislodged.
Tighten bolts (3) to a torque of 245 N m (181 lb ft).
Illustration 10 g02447421
Check the crankshaft end play. Push the crankshaft toward the front of the engine. Install Tooling (C) to the cylinder block and the rear face of the crankshaft. Push the crankshaft toward the rear of the engine. Use Tooling (C) to measure the crankshaft end play. The permissible crankshaft end play is 0.10 mm (0.004 inch) to 0.41 mm (0.016 inch).
Illustration 11 g02447422
Follow Steps 11.a through Step 11.d in order to install the bridge piece.
Ensure that the cylinder block and the bridge piece are clean, dry, and free from old sealant.
Install bridge