C7.1 Marine Engine Caterpillar

Removal Procedure

Start By:

1. Remove the engine oil pump.

2. Remove the front housing.

3. Remove the crankshaft rear seal.

4. If necessary, remove the cylinder head.

5. If necessary, remove the pistons and connecting rods.

1. The engine should be mounted on a suitable stand and placed in the inverted position.

2. If the cylinder head, the pistons and the connecting rods have not been removed already, remove the connecting rod bearings. Refer to Disassembly and Assembly, "Connecting Rod Bearings - Remove" for the correct procedure.

3. Ensure that the main bearing caps are marked for the location and orientation.
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   Illustration 1	g02204377

4. Remove bolts (3). Remove tube assembly (2) and gaskets (1) (not shown).
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   Illustration 2	g02212653

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   Illustration 3	g02212654

5. Remove bolts (4) and main bearing caps (5) from the cylinder block.

6. Remove lower main bearing shells (6) from main bearing caps (5). Keep the lower main bearing shells with the respective main bearing caps.

   Note: The lower main bearing shells are plain bearings that have no oil holes.

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   Illustration 4	g02212693

7. For number six main bearing, remove two thrust washers (7) from the cylinder block. In order to remove thrust washers (7), rotate the crankshaft in the correct direction. If necessary, push the crankshaft toward the front of the engine while you rotate the crankshaft, in order to aid removal. If necessary, 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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   Illustration 5	g02212655

8. Attach Tooling (A) and a suitable lifting device to crankshaft (8). Lift crankshaft (8) out of the cylinder block. The weight of crankshaf (8) t is approximately 61 kg (134 lb).

   Note: Do not damage any of the finished surfaces on the crankshaft. When the crankshaft is removed from the engine, the crankshaft must be supported on a suitable stand to prevent damage to the crankshaft timing ring.

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   Illustration 6	g02212656

9. Remove upper main bearing shells (9) from the cylinder block. Keep the upper main bearing shells with the respective main bearing caps.

   Note: The upper main bearing shells have a groove and two oil holes.

10. If necessary, remove the crankshaft timing ring. Refer to Disassembly and Assembly, "Crankshaft Timing Ring - Remove and Install" for the correct procedure.

11. If necessary, remove the crankshaft gear. Refer to Disassembly and Assembly, "Crankshaft Gear - Remove and Install" for the correct procedure.

Installation Procedure

1. Clean the crankshaft and inspect the crankshaft for wear and damage. Refer to Specifications, "Crankshaft" for more information. If necessary, replace the crankshaft or recondition the crankshaft.

2. If necessary, install the crankshaft gear. Refer to Disassembly and Assembly, "Crankshaft Gear - Remove and Install" for the correct procedure.

3. If necessary, install a new crankshaft timing ring. Refer to Disassembly and Assembly, "Crankshaft Timing Ring - Remove and Install" for the correct procedure.

4. Ensure that parent bores for bearing shells in the cylinder block are clean. Ensure that the threads for the main bearing bolts in the cylinder block are clean and free from damage.

5. Clean the main bearing shells and the thrust washers. Inspect the main bearing shells and the thrust washers for wear and damage. If necessary, replace the main bearing shells and the thrust washers.

   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.

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   Illustration 7	g02212656

6. Install upper main bearing shells (9) to the cylinder block. Ensure that the locating tabs for the upper main bearing shells are seated in the slots in the cylinder block.

   Note: The upper main bearing shells have a groove and two oil holes.

7. Lubricate upper main bearing shells (9) with clean engine oil.
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   Illustration 8	g02212655

8. Attach Tooling (A) and a suitable lifting device to crankshaft (8). Lift crankshaft (8) into the cylinder block. The weight of crankshaft (8) is approximately 61 kg (134 lb).

   Note: Do not damage any of the finished surfaces on the crankshaft. Do not damage the main bearing shells.

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   Illustration 9	g02212693

9. Lubricate thrust washers (7) with clean engine oil. Install thrust washers (7) into number six main bearing in the cylinder block.

   Note: The grooves in the thrust washers must be located against the crankshaft. The thrust washers have a locating tab at one end. Ensure that the locating tabs are correctly seated in the cylinder block.

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   Illustration 10	g02212654

10. Install lower main bearing shells (6) into main bearing caps (5). Ensure that the locating tabs for the lower main bearing shells are correctly seated into the slots in the bearing caps.

    Note: The lower main bearing shells are plain bearings that do not have oil holes.

11. Lubricate lower main bearing shells (6) and lubricate the journals of the crankshaft with clean engine oil. Install main bearing caps (5) to the cylinder block.

    Note: Ensure the correct location and orientation of main bearing caps (5). The locating tabs for the upper and the lower main bearing shells should be on the same side of the engine.

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    Illustration 11	g02214093

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

13. Install bolts (4) to main bearing caps (5). Evenly tighten the bolts in order to pull the caps into position. Ensure that the caps are correctly seated.

    Note: Do not tap the main bearing caps into position as the bearing shells may be dislodged.

14. 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 final torque.

15. Rotate the crankshaft in order to ensure that there is no binding.
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    Illustration 12	g01399694

16. 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 to 0.41 mm (0.004 to 0.016 inch)
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    Illustration 13	g02204377

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

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

19. Install bolts (3).

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

21. If the crankshaft has not been replaced or the crankshaft has not been reconditioned, install the connecting rod bearings. Refer to Disassembly and Assembly, "Connecting Rod Bearings - Install" for the correct procedure.

End By:

1. If necessary, install the pistons and connecting rods.

2. If necessary, install the cylinder head

3. Install the crankshaft rear seal.

4. Install the front housing.

5. Install the engine oil pump.