HOOD AS-ENGINE 4648667 - Caterpillar

Illustration 2 g03003178
Typical example
Remove lower main bearing shell (3) from main bearing cap (2). Keep the main bearing shell and the main bearing cap together.Note: The lower main bearing shell is a plain bearing that has no oil holes.
Illustration 3 g03003457
Illustration 4 g03003257
Push out upper main bearing shell (5) with a suitable tool from the side opposite the locating tab. Use Tooling (A) to rotate the crankshaft while pushing on the bearing shell. Remove upper main bearing shell (5) from the cylinder block. Keep the bearing shells together. The thrust washers (4) are attached to number three upper main bearing shell, make a note of the orientation of the thrust washers for installation purposes. Note: The upper main bearing shell has a groove and oil hole.Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
B 8T-3052 Degree Wheel 1
C - Dial Indicator 1
- Magnetic Base and Stand 1
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.Note: If the main bearing shells are replaced, check whether oversize main bearing shells were previously installed. If the thrust washers are replaced, check whether oversize thrust washers were previously installed.
Clean the journals of the crankshaft. Inspect the journals of the crankshaft for damage. If necessary, replace the crankshaft or recondition the crankshaft.
Illustration 5 g03003457
Illustration 6 g03003257
For number three main bearing, ensure that two thrust washers (4) are clean and free from wear and damage. If necessary, replace the thrust washers. Lubricate thrust washers (4) with clean engine oil.Note: The upper main bearing shell has a groove and oil hole.
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.
Illustration 7 g03003178
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.Note: The lower main bearing shell is a plain bearing that has no oil holes.
Illustration 8 g03003700
Lubricate the crankshaft journal and the lower main bearing shell with clean engine oil. Install main bearing cap (5) to the cylinder block.Note: Ensure the correct orientation of the main bearing cap. The locating tab for the upper and the lower bearing must be on opposite sides of the engine.
Lubricate the threads of bolts (4) with clean engine oil. Lubricate the underside of the heads of bolts (4) with clean engine oil.
Install bolts (4) to main bearing cap (5).