C12 Marine Engines Caterpillar

Installation Procedure

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Illustration 1	g01108128

1. Place the upper halves of the crankshaft main bearings in the cylinder block. Place the lower halves of crankshaft main bearings (5) in crankshaft main bearing caps (4) .

2. Attach Tooling (A) and a suitable lifting device to crankshaft (6). The weight of the crankshaft is approximately 180 kg (400 lb). Position crankshaft (6) in the cylinder block.

3. Install crankshaft thrust bearings (3) .

4. Install crankshaft main bearing caps (4) with the part numbers toward the right hand side of the cylinder block. Ensure that crankshaft main bearing caps (4) have numbers 1 through 7. The numbers should start at the front of the engine. Apply clean engine oil or Molylube to the bolt threads and the washers. Install the bolts. Tighten the bolts to a torque of 95 ± 5 N·m (70 ± 4 lb ft).

5. Place an index mark on each bolt head. Turn the bolts for an additional 90 ± 5 degrees (1/4 turn).

6. Check the end play of the crankshaft with Tooling (B). The end play must be 0.10 mm (0.004 inch) to 0.50 mm (0.020 inch).

7. Install connecting rod bearings (1) .

8. Install connecting rod bearing caps (2) .

9. Install the connecting rod cap bolts. Tighten the bolts to a torque of 130 ± 7 N·m (95 ± 5 lb ft).

10. Place an index mark on each bolt head. Tighten each bolt for an additional 60 ± 5 degrees (1/6 turn).

End By:

1. Install the flywheel housing. Refer to Disassembly and Assembly, "Flywheel Housing - Remove and Install".
2. Install the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Install".