Procedure for Replacing the Turbine Inlet Bellows on Certain C175 Engines {1061} Caterpillar


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Procedure for Replacing the Turbine Inlet Bellows on Certain C175 Engines {1061} [REHS9207]
AIR INLET AND EXHAUST SYSTEM
TURBOCHARGER GP
Procedure for Replacing the Turbine Inlet Bellows on Certain C175 Engines {1061}
1.1. Introduction
2.1. Required Tooling
3.1. Required Parts
4.1. Removal and Installation Procedure
Locomotive Engine
C175-16 (S/N: 3A91-UP; Y3A1-UP; KWT1-UP; R1X1-UP)
Off Highway Truck
793F (S/N: SND1-UP; SSP1-UP; RBT1-UP)
793F AC (S/N: EMD1-UP)
795F AC (S/N: ERM1-UP)
797F (S/N: LAJ1-UP; WSP1-UP)

Introduction

The following Special Instruction is used to replace the turbine inlet bellows on C175 Engines.

Do not perform any procedures listed in this Special Instruction until you have read and understood the information.

Required Tooling

Table 1
Tooling 
Part Number  Description 
421-4080  Tool As 
452-6804  Tool As 

Required Parts

Table 2
793F, 795F, 797F, and Locomotive Low Altitude Arrangements 
Part Number  Description  Quantity 
446-1290  V Band Clamp 
443-5940  Bellows As 

Note: All four turbocharger locations utilize the same turbine inlet elbows on low altitude arrangements.

Table 3
793F and 795F High Altitude Arrangements 
Part Number  Description  Quantity 
446-1290  V Band Clamp 
443-5940  Bellows As 

Note: Only the two outside turbocharger locations utilize the new turbine inlet bellows. The inner two turbochargers utilize a different

Note: The 797F HAA does not use this bellows assembly.

Removal and Installation Procedure



    Illustration 1g03545418
    (1) Existing V band clamps

  1. Remove V band clamps (1) from the current turbine inlet bellows and discard the clamps.


    Illustration 2g03545436
    (2) 348-9252 Bellows As

  2. Install the 421-4080 Tool As and compress bellows assembly (2).

  3. Removed the existing bellows assembly.


    Illustration 3g03545737
    Section view of the bellow tool installed
    (A) Bellows tool
    (B) Bellow ring
    (C) Bellow

  4. Install the 452-6804 Tool As onto the new 443-5940 Bellows As. Refer to Illustration 3 for the correct installation of the tool assembly.

  5. Compress the new bellows enough to allow for installation between the exhaust manifold and turbocharger.

    Note: Ensure that the flow arrow on the bellows is pointing in the correct direction of exhaust flow.

  6. Release and remove the compression tool after bellows is in place.

  7. Install new 446-1290 V Band Clamps onto the turbine inlet bellows.


    Illustration 4g03546119
    (3) Bellow ring fully seated
    (4) Bellow ring not fully seated

  8. Ensure that the new bellows ring is fully seated under the clamp prior to tightening the V band clamp. Refer to Illustration 4.

    Note: If the ring is not fully seated, remove the clamp and seat the ring again.

  9. Tighten the clamp assemblies to 17 ± 2 N·m (150 ± 17 lb in). Lightly tap around the clamp and retighten to 17 ± 2 N·m (150 ± 17 lb in).