SPRING 2Y8726 - Caterpillar

Engines:
G3606 (S/N: 3XF1-UP)
G3608 (S/N: 4WF1-UP)
G3612 (S/N: 1YG1-UP)
G3616 (S/N: 4CG1-UP)
Description of Change: New prechamber gaskets, prechamber assemblies, and ignition body assembly have been made available for use in all G3600 Engines in natural gas applications.The new prechamber gaskets are made of a different material in order to better conform to the mating surfaces of the cylinder head, ignition body, and prechamber assembly. Some dimensions of the new gaskets are different. This improves the load distribution between the upper gaskets and the lower gaskets that are used in two-piece ignition body and prechamber assemblies.The new ignition body assembly is for natural gas applications that have a 9:1 Compression Ratio (C/R). This new ignition body assembly combines the ignition body and the prechamber assembly into a single welded prechamber assembly.Adaptable To: The Table and Illustrations identify the prechamber groups, group components, and applications. The Illustrations identify the effectivity of the prechamber groups.
Table 1
Prechamber Group     Gaskets     Former Gaskets     Ignition Body     Prechamber Assembly    
110-5469 (9:1 C/R) (two-piece assembly)     187-6614 (Upper) (1) 187-6613 (Lower)     173-6574 (Upper) 173-6573 (Lower)     173-7681     114-3365    
110-5469 (9:1 C/R) (single piece assembly)     187-6613 (Lower)     173-6573 (Lower)     not applicable     169-5456    
125-3805 (10.5:1 C/R) (2-piece assembly)     187-6615 (Upper) 174-0130 (Lower)     173-6574 (Upper) 173-6573 (Lower)     173-7681     125-3848    
117-4911 (Low BTU) (Landfill and Digestor)     187-6615 (Upper) 174-0130 (Lower)     173-6574 (Upper) 173-6573 (Lower)     173-7663     125-3848    
( 1 ) This parts is for 9:1 C/R applications only.
Illustration 1 g00728348
This illustration shows the locations of gaskets, prechamber assembly, and ignition body for the two-piece design of the 110-5469 Prechamber Group for 9:1 C/R applications. The two-piece design of the 110-5469 Prechamber Group is effective with G3606 S/N:3XF1-215
, G3608 S/N:4WF1-142
, G3612 S/N:1YG1-183
, and G3616 S/N:4CG1-156
. (1) 173-7681 Chamber Body Assembly (Ignition Body) (2) 125-3848 Prechamber Assembly (3) 187-6614 Gasket (Upper) (4) 187-6613 Gasket (Lower)Note: The new 187-6613 Gasket (Lower) and the new 187-6614 Gasket (Upper) are NOT recommended for applications that have corrosive components in the engine fuel supply. One example of a corrosive engine fuel supply component is H2S.
Illustration 2 g00728528
This illustration shows the locations of the gasket and prechamber assembly for the single piece prechamber assembly design of the 110-5469 Prechamber Group for 9:1 C/R applications. The one-piece design of the 110-5469 Prechamber Group is effective with G3606 S/N:3XF216-UP
, G3608 S/N:4WF143-UP
, G3612 S/N:1YG184-UP
, and G3616 S/N:4CG157-UP
. The new gaskets are effective with G3606 S/N:3XF268-UP
, G3608 S/N:4WF165-UP
, G3612 S/N:1YG202-UP
, and G3616 S/N:4CG187-UP
. (4) 187-6613 Gasket (Lower) (5) 169-5456 Prechamber Assembly Note: The one-piece prechamber assembly is NOT recommended for landfill/digester gas applications. The one-piece prechamber assembly is NOT recommended for high efficiency