Inspection

cen mm 49.01.000

  1. Check for leakage at the clamp that attaches the exhaust pipe to the turbocharger exhaust outlet. If leakage exists, tighten the nut on the clamp to the required torque. If leakage persists, install a new clamp.
  2. Check the exhaust pipe, bellows, and each exhaust seal clamp for leakage, wear, cracks, or damage. Replace damaged components as needed. If leakage exists at a clamp, tighten the nuts to the required torque. If leakage persists, install a new exhaust seal clamp. Do not reuse seal clamps. Once a seal clamp is loosened or removed, it must be replaced.

    3. Notice: A leak in the CGI piping, including the bellows, will allow unfiltered air and contaminants into the engine intake, and can cause serious engine damage.

    Note: Because the CGI bellows is covered with a metal mesh, it is difficult to see cracks or damage that may cause a leak.

  3. On vehicles with CAT engines, inspect the CGI bellows and piping for evidence of damage or leakage. See Fig.. If the bellows is damaged or leaking, replace it. See Replacement of the CAT CGI Bellows for the replacement procedure.

    1. Clamp

    2. Inlet Pipe

    3. U-Clamp

    4. Forward Pipe-Support Brace

    5. Slip Clamp

    6. CGI Bellows

    7. Center Pipe-Support Brace

    8. Center Pipe

    9. Clamp

    10. Outlet Pipe

    Fig. 1, CAT EPA07 Exhaust Installation with CGI Bellows

  4. If present, check the condition of the insulation material around the exhaust pipe between the turbocharger and the ATD.
  5. Check the ATD mounting bands for tightness. Tighten to 30 lbf·ft (41 N·m) if needed. Do not overtighten.
  6. Check for leaks around the clamps that attach the ATD in the ATS, and around the clamps that retain the DPF in the ATD. No leaks are allowed anywhere in the system.
  7. Check all sensors attached to the ATD for leaks or damaged wires. No leaks are allowed.
  8. Check the DPF exterior surface for dents or other damage. See Item A of Fig.. A dent over 3 inches (76 mm) in diameter and 1/4-inch (6-mm) deep could cause internal damage to the DPF, causing it to malfunction.

    • Inspect this area of the canister for dents.

    1. Marmon Fitting at Inlet from Turbocharger

    2. DOC Temperature Sensor

    3. ATD Mounting Band

    4. DPF Intake Pressure Sensor

    5. DPF V-Band Mounting Clamps

    6. Sensor Housing

    7. DPF Outlet Temperature Sensor

    8. Exhaust Outlet Marmon Fitting

    9. DPF Outlet Pressure Sensor

    Fig. 2, Typical After-Treatment Device

  9. Check for heat discoloration on the surface of the ATD. Heat discoloration may indicate internal damage; especially around the DPF.
  10. Check any wires, lines, or hoses within 4 inches (10 cm) of the exhaust system for heat damage. Repair or reroute as needed.
Note:
Parent topic: Inspecting of the EPA07 Exhaust System
Document Number: 0000122449
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-06-04