2005/08/29 Caterpillar

Engine:

3508B (S/N: S2A1-UP; S2B1-UP; S2D1-UP; S2E1-UP; S2F1-UP; 2BM1-UP; 3DM1-UP; 7SM1-UP; 5PS1-UP; 1TW1-UP; 3DW1-UP; BPX1-UP; CTC1-UP; 1FZ1-UP)

3508C (S/N: TTA1-UP; TTB1-UP)

Generator Set:

3508B (S/N: LPD1-UP; BAG1-UP)

Engine News SEBD9365, 29 August 2005, "New Exhaust Bellows Provide Improved Sealing of Exhaust Gas". Disregard the article. Refer to the information below.

Description of Change: A new bellows assembly has improved sealing capability.

Adaptable To: On the 3508B, the new 322-8956 Bellows As is a direct replacement for the 272-2498 Bellows As. On the 3508C, the new 322-8956 Bellows As is a direct replacement for the 304-0471 Bellows As and the 304-9110 Guard. The new bellows assembly is used in the following manifold groups:

• 123-0324 Exhaust Manifold Gp

• 9Y-4864 Exhaust Manifold Gp

• 305-6816 Exhaust Manifold Gp

Refer to Tables 1 and 2.

Table 1

123-0324 Exhaust Manifold Gp and 9Y-4864 Exhaust Manifold Gp
Quantity	Description	Remove Part.	Install Part.
1	Bellows As	272-2498	322-8956

Table 2

305-6816 Exhaust Manifold Gp
Quantity	Description	Remove Part.	Install Part.
1	Exhaust Bellow	304-0471	322-8956
1	Guard	304-9110	322-8956

The former bellows assembly has been cancelled and replaced by the new bellows assembly. The new bellows are adaptable to all earlier engines. Serial number effectivity is listed in Table 3.

Illustration 1	g01523967
(1) 322-8956 Bellows As

Table 3

3508B Serial Number Effectivity

Serial Number

S/N:BAG00025-UP

S/N:7SM01015-UP

S/N:2BM00198-UP

S/N:3DM00506-UP

S/N:3DW00187-UP

S/N:1TW00363-UP

S/N:S2B00205-UP

S/N:S2D00148-UP

S/N:S2E00381-UP

S/N:S2F00110-UP

S/N:CTC00263-UP

S/N:1FZ03190-UP

S/N:5PS00345-UP

S/N:S2A00119-UP

S/N:BPX00115-UP

S/N:LPD00013-UP

3508C Serial Number Effectivity

S/N:TTA00200-UP

S/N:TTB00200-UP