C7.1 Marine Propulsion Engine Caterpillar

Installation Procedure

Reference: Special Instruction, "Visual Service Procedures - Colors and Symbols" M0066576.

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.

Illustration 1	g06280744

Note: Ensure that the locating tabs for the upper main bearing shells are seated in the slots in the cylinder block. The upper main bearing shells have a groove and two oil holes.

Lubricate upper main bearing shells (9) with clean engine oil.

Illustration 2	g06280746

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

Illustration 3	g06280751

Lubricate the thrust washers with clean engine oil. Install the thrust washers 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.

Illustration 4	g06280756

Note: Ensure that the locating tabs for the lower main bearing shells are correctly seated into the slots in the bearing caps. The lower main bearing shells are plain bearings that do not have oil holes.

Illustration 5	g06280760

Lubricate the lower main bearing shells and lubricate the journals of the crankshaft with clean engine oil.

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

Lubricate the threads of the bolts with clean engine oil. Lubricate the underside of the heads of the bolts with clean engine oil.

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

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

Rotate the crankshaft to ensure that there is no binding.

Illustration 6	g06280810

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).

Illustration 7	g06280821

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.