C12 Marine Engines Pistons and Connecting Rods - Disassemble Caterpillar

Pistons and Connecting Rods - Disassemble
1.1. Disassembly Procedure

Disassembly Procedure

Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     4C-3601     Piston Ring Expander     1    
B     5P-8639     Hydraulic Press     1    
8F-0024 Hose Assembly     1    
1P-2375 Connecting Coupler     1    
1P-2376 Connecting Coupler     1    
5P-9725 Hydraulic Cylinder     1    
5P-8651 Spacer     1    
5P-8649 Adapter     1    
5P-8650 Adapter     1    

Start By:

  1. Remove the pistons and the connecting rods. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Remove ".


Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.

    Illustration 1g01062444

    Illustration 2g01062446

  1. Use Tooling (A) to remove piston rings (1) from piston crown (2) .

  1. Remove plug (3) and piston pin (5) .

  1. Separate piston crown (2) from piston skirt (4) and connecting rod (7) .


    The connecting rod must be heated for the installation of the piston pin bearing. Do not use a torch.

  1. Raise the temperature of connecting rod (7) along Length (X). The maximum distance of Length (X) is 85.0 mm (3.35 inch).

  1. Use Tooling (B) to remove old bearing (6) and install new bearing (6) at the same time.

  1. The bearing joint must be within 10 degrees of one of the locations that are indicated by the arrows.