SHEET 3Y0269 - Caterpillar

Ensure that the main bearings are clean and free from wear or damage. If necessary, replace the main bearings.
Clean the journals of the crankshaft. Inspect the journals of the crankshaft for damage. If necessary, replace the crankshaft or recondition the crankshaft.
Illustration 8 g01253145
Typical example
Illustration 9 g01889993
No. 1 Upper Main Bearing
Lubricate the crankshaft journal and upper main bearing (9) with clean engine oil. Slide upper main bearing (9) into position between the crankshaft journal and the cylinder block. Ensure that the locating tab for the upper main bearing is correctly seated in the slot in the cylinder block.Note: Number 1 upper main bearing has an oil slot. See Illustration 9. All other upper main bearings have a groove and two oil holes.
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Typical example
For number three main bearing, ensure that thrust washers (8) are clean and free from wear or damage. If necessary, replace the thrust washers. Lubricate thrust washers (8) with clean engine oil. Slide the thrust washers into position between the crankshaft and the cylinder block. The grooves in the thrust washers must be located against the crankshaft.
Illustration 11 g01253146
Typical example
Install lower main bearing (5) into main bearing cap (4) . Ensure that the locating tab for the lower main bearing is correctly seated into the slot in the bearing cap.Note: The lower main bearing is a plain bearing that has no oil holes.
Illustration 12 g01253137
Typical example
For number three main bearing cap, ensure that thrust washers (7) are clean and free from wear or damage. If necessary, replace the thrust washers. Lubricate thrust washers (7) with clean engine oil. Place the thrust washers into position on the main bearing cap. Ensure that the locating tab is correctly seated in the main bearing cap.
Illustration 13 g01253719
Typical example
Lubricate the crankshaft journal and the lower main bearing 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 the bolts with clean engine oil.
Install bolts (3) to main bearing cap (4) . Evenly tighten the bolts in order to pull cap (5) into position. Ensure that the cap is correctly seated.Note: Do not tap the main bearing cap into position as the bearing may be dislodged.
Tighten bolts (3) to a torque of 245 N m (180 lb ft).
Illustration 14 g01253186
Typical example
Check the crankshaft end play. Push the crankshaft toward the front of the engine. Install Tooling (B) to the cylinder block and the rear face of the crankshaft. Push the crankshaft toward the rear of the engine. Use Tooling (B) to measure the crankshaft end play. The permissible crankshaft end play is 0.17 to 0.41 mm (0.007 to 0.016 inch).
Illustration 15 g01253836
Typical example
Follow Step 12.a through Step 12.d in order to install the bridge piece.
Ensure that the recess in the cylinder block and the bridge piece are clean, dry and free