SUPPORT AS 3918686 - Caterpillar

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.
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For number six main bearing, remove two thrust washers (4) from the cylinder block. In order to remove thrust washers (4), rotate the crankshaft in the correct direction. If necessary, push the crankshaft toward the front of the engine or push the crankshaft toward the rear of the engine while you rotate the crankshaft, in order to aid removal. Note: The thrust washers have a locating tab at one end.
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Push out upper main bearing shell (5) with a suitable tool from the side opposite the locating tab. Carefully rotate the crankshaft while you push on the bearing shell. Remove upper main bearing shell (5) from the cylinder block. Keep the bearing shells together. Note: The upper main bearing shell has a groove and two oil holes.Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 8T-3052 Degree Wheel 1
B 8T-5096 Dial Indicator Gp 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 or 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 5 g01341335
Lubricate the crankshaft journal and upper main bearing shell (5) with clean engine oil. Slide upper main bearing shell (5) 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 6 g01341325
For number six main bearing, ensure that two thrust washers (4) are clean and free from wear or damage. If necessary, replace the thrust washers. Lubricate thrust washers (4) 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.
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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 g01744533
Lubricate the crankshaft journal and the lower main bearing shell with clean engine oil. Install main bearing cap (2) 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