2008/01/07 Caterpillar

Generator Set:

C9 GEN SET (S/N: SRB1-UP; C9E1-UP; X3R1-UP; SJB1-UP; C9A1-UP)

Industrial Engine:

3126B (S/N: DCS1-UP; BEJ1-UP)

C7 (S/N: JTF1-UP; JRA1-UP)

C9 INDUSTRIAL (S/N: JSC1-UP; MBD1-UP; JLW1-UP)

C-9 (S/N: CLJ1-UP)

Marine Engine:

C7 MARINE (S/N: C7B1-UP; C7D1-UP; C7X1-UP; C7Z1-UP)

C9 MARINE (S/N: C9B1-UP; CSN1-UP; X9X1-UP; Z9X1-UP)

Petroleum Engine:

C9 PETROLEUM (S/N: P9L1-UP)

Description of Change: The new O-rings that are used on the injector sleeve have been improved. The O-rings are now made with a more rugged material.

Adaptable To:

Illustration 1	g01437338
(1) Top O-ring (2) Bottom O-ring (3) Injector Sleeve

When 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
Bottom O-ring	310-7257	C7
		C9
		3126

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.