2015/09/17 Caterpillar


New Cylinder Pack Assemblies Are Available in Sets for Certain C18 Engines {1201, 1216, 1225, 1239}

Usage:

C18 CKH
Gen Set Engine
C18 MARINE GS (S/N: CYN1-UP)
Generator Set
C18 MARINE GS (S/N: GBM1-UP; GEN1-UP; MGS1-UP)
Industrial Engine
C18 (S/N: GJE1-UP; EJG1-UP)
C18 INDUSTRIAL (S/N: JDA1-UP; NBB1-UP; WJH1-UP; WRH1-UP)
Locomotive Engine
C18 LOCOMOTIVE (S/N: EWS1-UP)
Marine Engine
C18 MARINE (S/N: PLE1-UP; CKH1-UP; GES1-UP; KJT1-UP)
C18 MARINE ENG (S/N: J2K1-UP; T2P1-UP)
Petroleum Engine
C18 PETROLEUM (S/N: WJW1-UP; WJY1-UP)

Reference: Disassembly and Assembly, "Pistons and Connecting Rods - Install"

Reference: Special Instruction, REHS9671 for the proper break-in procedure for all packs listed herein.

The new 20R-0629 Cylinder Pack As, 20R-0630 Cylinder Pack As, 20R-0631 Cylinder Pack As, and 20R-0632 Cylinder Pack As are composed of a single piece steel piston with a lower ring land support.

Note: Due to a difference in the weight of the new pistons and existing pistons, the new piston must not be matched with the existing pistons. All the pistons must be replaced in an engine as a set.

The new 20R-0629 Cylinder Pack As is adaptable back to first production on the serial numbers that are listed above. Refer to Table 1 for information on the new cylinder pack assemblies and the parts that are replaced.

Table 1
20R-0629 Cylinder Pack As (18:1 Compression Ratio) 
New Part Number Included  Existing Part Number  Part Description 
20R-0629  10R-8760  Cylinder pack 
368-7818  329-4511  Piston 
250-2940  230-2569  Retainer 

The new 20R-0630 Cylinder Pack As is adaptable back to first production on the serial numbers that are listed above. Refer to Table 2 for information on the new cylinder pack assemblies and the parts that are replaced.

Table 2
20R-0630 Cylinder Pack As (16.5:1 Compression Ratio) 
New Part Number Included  Existing Part Number  Part Description 
20R-0630  10R-9025  Cylinder pack 
368-7817  461-9954  Piston 
250-2940  230-2569  Retainer 

The new 20R-0631 Cylinder Pack As is adaptable back to first production on the serial numbers that are listed above. Refer to Table 3 for information on the new cylinder pack assemblies and the parts that are replaced.

Table 3
20R-0631 Cylinder Pack As (16.3:1 Compression Ratio) 
New Part Number Included  Existing Part Number  Part Description 
20R-0631  10R-8763  Cylinder pack 
368-7816  329-4510  Piston 
250-2940  230-2569  Retainer 

The new 20R-0632 Cylinder Pack As is adaptable back to first production on the serial numbers that are listed above. Refer to Table 4 for information on the new cylinder pack assemblies and the parts that are replaced.

Note: The 20R-0632 Cylinder Pack As is not for use in S/N:CKH, ; S/N:PLE, or ; S/N:JKX engines above 900 hp.

Table 4
20R-0632 Cylinder Pack As (14.5:1 Compression Ratio) 
New Part Number Included  Existing Part Number  Part Description 
20R-0632  10R-9024  Cylinder pack 
368-7815  461-9953  Piston 
250-2940  230-2569  Retainer 


Illustration 1g02552100
Shape of the existing piston that is replaced


Illustration 2g02552196
Shape of the new piston with the lower ring land support

Refer to Tables 5 through 8 for information on the parts that are included in the new cylinder pack assemblies.

Table 5
Components within the 20R-0629 Cylinder Pack As 
Part Number  Description  Quantity 
10R-2117  Connecting Rod 
180-7350  Piston Pin 
223-9159  Top Piston Ring 
238-2707  Int. Ring 
246-5659  Oil Ring 
250-2940  Pin Retainer 
368-7818  Piston Body As 
322-1126  Cylinder Block Liner 
258-8117  Gasket Kit 

Table 6
Components within the 20R-0630 Cylinder Pack As 
Part Number  Description  Quantity 
10R-2117  Connecting Rod 
359-4587  Piston Pin 
223-9159  Top Piston Ring 
238-2707  Int. Ring 
246-5659  Oil Ring 
250-2940  Pin Retainer 
329-4509  Piston Body As 
322-1126  Cylinder Block Liner 
348-3295  Gasket Kit 

Table 7
Components within the 20R-0631 Cylinder Pack As 
Part Number  Description  Quantity 
10R-2117  Connecting Rod 
180-7350  Piston Pin 
223-9159  Top Piston Ring 
238-2707  Int. Ring 
246-5659  Oil Ring 
250-2940  Pin Retainer 
368-7816  Piston Body As 
322-1126  Cylinder Block Liner 
258-8117  Gasket Kit 

Table 8
Components within the 20R-0632 Cylinder Pack As 
Part Number  Description  Quantity 
10R-2117  Connecting Rod 
359-4587  Piston Pin 
349-2568  Top Piston Ring 
344-5153  Int. Ring 
246-5659  Oil Ring 
250-2940  Pin Retainer 
368-7815  Piston Body As 
322-1126  Cylinder Block Liner 
348-3295  Gasket Kit 

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