2008/11/24 Caterpillar

Engine:

3508B (S/N: S2E1-UP; 2BM1-UP; 3DM1-UP; 7SM1-UP; 5PS1-UP)

3512B (S/N: S2J1-UP; S2L1-UP; 7HM1-UP; 8EM1-UP; 4TN1-UP; 2GW1-UP; 3ZW1-UP; 2EZ1-UP)

3516B (S/N: 8KN1-UP; S2S1-UP; 3CW1-UP)

Description of Change: A new torque procedure and a new design for the half flange has improved the sealing capability at the exhaust bellows joint.

Adaptable To: The new 329-3716 Half Flange aligns the split in the joint of the half flanges with the mounting holes of the turbocharger. The new torque procedure and the new design for the half flange improves the load distribution for the 207-1354 Gasket and the 207-1382 Exhaust Gasket .

Part numbers are listed in Table 1.

Illustration 1	g01551893
Typical example (1) Half flanges (2) Locations for the gaskets (3) Exhaust bellows

Tightening Procedure for 4 Bolt Half Flanges that are Used at the Exhaust Bellows Joint

Illustration 2	g01551613
Half flanges with 4 bolt pattern (1) 188-0471 Half Flange (1) 188-0472 Half Flange (1) 188-0473 Half Flange (1) 188-0474 Half Flange

1. Tighten the "X" bolts at the split in the flange in any sequence.

   Torque ... 54 ± 5 N·m (40 ± 4 lb ft)

2. Tighten the "Y" bolts in any sequence.

   Torque ... 54 ± 5 N·m (40 ± 4 lb ft)

Tightening Procedure for the 329-3716 Half Flange

Illustration 3	g01551713
Half flange with 6 bolt pattern (1) 329-3716 Half Flange

1. Tighten the "X" bolts at the split in the flange in any sequence.

   Torque ... 54 ± 5 N·m (40 ± 4 lb ft)

2. Tighten the "Y" bolts in any sequence.

   Torque ... 54 ± 5 N·m (40 ± 4 lb ft)

Tightening Procedure for the 188-0475 Half Flange

Illustration 4	g01551833
Half flange with 6 bolt pattern (1) 188-0475 Half Flange

1. Tighten the "X" bolts near the split in the flange in any sequence.

   Torque ... 54 ± 5 N·m (40 ± 4 lb ft)

2. Tighten the "Y" bolts in any sequence.

   Torque ... 54 ± 5 N·m (40 ± 4 lb ft)