COVER GP-CYLINDER BLOCK 9N3867 - Caterpillar

Illustration 1 g01437338
(1) Top O-ring (2) Bottom O-ring (3) Injector SleeveWhen the injector sleeves are replaced, also replace the O-rings. Refer to Table 1 for the proper O-ring for your engine.
Table 1
New O-rings    
Location     Part Number     Sales Model    
Top O-ring     310-7255     C7    
C9
3126
Top O-ring     310-7258     C7 with the S/N:C7S1-UP serial number prefix    
C9 with the S/N:C9S1-UP serial number prefix
Bottom O-ring     310-7257     C7    
C9
3126
Bottom O-ring     310-7259     C7 with the S/N:C7S1-UP serial number prefix    
C9 with the S/N:C9S1-UP serial number prefix Refer to your engine's Disassembly and Assembly Guide, "Unit Injector Sleeve - Install" for the proper installation procedure for the new O-rings and the new injector sleeve.