C6.6 Industrial Engine Crankshaft Main Bearings - Remove and Install - Crankshaft in position Caterpillar

Removal Procedure

Start By:

1. Remove the engine oil pump. Refer to Disassembly and Assembly, "Engine Oil Pump - Remove" for the correct procedure.

2. Remove the crankshaft rear seal. Refer to Disassembly and Assembly, "Crankshaft Rear Seal - Remove" for the correct procedure.

1. Ensure that the main bearing cap is marked for the correct location and orientation.
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   Illustration 1	g02204377

2. Remove bolts (3) from tube assembly (2).

3. Remove tube assembly (2) from the cylinder block.

4. Remove gaskets (1) (not shown).
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   Illustration 2	g02204373

5. Remove bolts (4) and remove main bearing cap (5) from the cylinder block.
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   Illustration 3	g02204374

6. Remove lower main bearing shell (6) from main bearing cap (5). 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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   Illustration 4	g02204375

7. For number six main bearing, remove two thrust washers (7) from the cylinder block. In order to remove thrust washers (7), use Tooling (A) to rotate the crankshaft in the correct direction. If necessary, push the crankshaft toward the front or 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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   Illustration 5	g02204376

8. Push out upper main bearing shell (8) 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 (8) from the cylinder block. Keep the bearing shells together.

   Note: The upper main bearing shell has a groove and two oil holes.

Installation Procedure

1. 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.

2. Clean the journals of the crankshaft. Inspect the journals of the crankshaft for damage. If necessary, replace the crankshaft or recondition the crankshaft.
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   Illustration 6	g02204376

3. 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.

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   Illustration 7	g02204375

4. For number six 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 (7) 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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   Illustration 8	g02204374

5. Install lower main bearing shell (6) into main bearing cap (5). 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.

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   Illustration 9	g02204393

6. 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 should be on the same side of the engine.

7. Lubricate the threads of bolts (4) with clean engine oil. Lubricate the underside of the heads of bolts (4) with clean engine oil.

8. Install bolts (4) to main bearing cap (5). 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 shell may be dislodged.

9. Tighten bolts (4) to a torque of 80 N·m (59 lb ft).

   Turn bolts (4) through an additional 90 degrees. Use Tooling B to achieve the correct final torque.

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   Illustration 10	g01341329

10. 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).

11. Remove Tooling (C) from the cylinder block.
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    Illustration 11	g02204377

12. Position new gaskets (1) (not shown) onto the cylinder block.

13. Position tube assembly (2) onto the cylinder block.

14. Install bolts (3) to tube assembly (2).

15. Tighten bolts (3) to a torque of 22 N·m (195 lb in).

End By:

1. Install the crankshaft rear seal. Refer to Disassembly and Assembly, "Crankshaft Rear Seal - Install" for the correct procedure.

2. Install the engine oil pump. Refer to Disassembly and Assembly, "Engine Oil Pump - Install" for the correct procedure.