LUG 4F8122 - Caterpillar

Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 4C-3601 Piston Ring Expander 1
B 1P-1861 Retaining Ring Pliers 1 Note: Prior to removal from the engine, the pistons and connecting rod assemblies were marked. The components must be reassembled together. The components must be installed in the original location in the engine. Do not interchange any of the components.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g01261975Note: Ensure that pin (5) is covered in clean engine oil before assembly.Note: Use rotational movement to insert pin (5). This will prevent damage to the pin. Excessive force may damage pin (5).
Position connecting rod assembly (3) and piston assembly (1). Install pin (5).
Use Tooling (B) to install retaining rings (2).
Use the following procedure to install piston rings (4).
Position the spring for the oil control ring in the oil ring groove in the piston body assembly.
Position the oil control ring over the spring. Position the oil control ring so that the gap is 180 degrees from the joint in the spring. Use Tooling (A) to install the oil control ring on the piston.
Use Tooling (A) to install the intermediate piston ring with the side that has the identification “UP-2” toward the top of the piston.
Use Tooling (A) to install the top piston ring with the side that has the identification “UP-1” toward the top of the piston.
Position piston rings (4) so the gaps are 120 degrees from each other.
Check the clearance between the ends of piston rings (4). Refer to Specifications, "Piston And Rings". End By:
Install the pistons and the connecting rods. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Install".