C12 Marine Engines Pistons and Connecting Rods - Install Caterpillar

Installation Procedure

1. Place clean engine oil on the following items: the pistons, the piston rings and the cylinder bore.

2. Install Tooling (A) in order to compress the piston rings.

   Note: All three of the piston ring end gaps should be placed 120 degrees away from each other.

3. Install the piston and connecting rod in the engine. Ensure that the proper piston and connecting rod are in the corresponding cylinder with the bearing retainer notch toward the right side of the engine.

   Note: The word "FRONT" may be stamped on the crown of the pistons in some engines. Ensure that the word "FRONT" is toward the front of the engine when the piston is installed.

4. Install the upper half of the connecting rod bearing in the connecting rod. Place clean engine oil on the surface of the upper half of connecting rod bearing.

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Illustration 1	g01011732

5. Place the lower half of bearing (2) in connecting rod cap (1) .

6. Place clean engine oil on the surface of the lower half of bearing (2). Install connecting rod cap (1) on the connecting rod.

7. Lubricate the connecting rod cap bolts with Tooling (B) .

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

9. 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 piston cooling jets. Refer to Disassembly and Assembly, "Piston Cooling Jets - Remove and Install".
2. Install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install".