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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Mechanical - 3.0L (Lm2) Diesel - Repair Instructions (5 Of 11)) >> Repair Instructions >> Timing Belt Replacement (4WD) >> Installation Procedure

Installation Procedure

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  1. GM5145487Courtesy of GENERAL MOTORS COMPANY

    Timing Belt (1) @ Oil Pump Sprocket (2) - Install

  2. Oil Pump Sprocket (2) & Timing Belt (1) - Install
  3. Oil Pump Drive Bolt (3) - Install and hand tighten
  4. GM5145486Courtesy of GENERAL MOTORS COMPANY

    Install the EN-47634  Holder (1) with EN-956-1  Extension (4) onto the oil pump sprocket (2).

    5. CAUTION:

    Refer to Fastener Caution .

  5. Oil Pump Drive Bolt (3) Tighten - Fastener Specifications
  6. Remove the EN-47634  Holder (1) with EN-956-1  Extension (4).
  7. GM5766443Courtesy of GENERAL MOTORS COMPANY

    Secure the EN-52446-3  Base (1) in a vice.

  8. Install the 4 EN-52446-4  Studs (3) in base.
  9. Place the timing chain lower cover (2) outward facing side up on the base.
  10. Install the EN-52446-2  Seal Protector (4) onto the EN-52446-3  Base (1).
  11. Install the NEW crankshaft rear oil seal (5) to the EN-52446-3  Base (1), using the EN-52446-2  Seal Protector (4) to center the crankshaft rear oil seal (5).
  12. Remove the EN-52446-2  Seal Protector (4).
  13. GM5766445Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52446-1  Installer (1) on the crankshaft rear oil seal (4).

  14. Install the 4 washers (2) onto the EN-52446-4  Studs.
  15. Install the 4 EN-52446-5  Nuts (3) onto the studs.
  16. Hand tighten the 4 EN-52446-5  Nuts (3) evenly until the crankshaft rear oil seal (4) is fully seated in the cover.
  17. Remove the EN-52446  Assembly from the crankshaft rear oil seal (4).
  18. GM5145916Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If service part comes with seal protector then use inner seal protector ring to slip the seal lip over the crankshaft snout, instead of EN-52446-2  Seal Protector.

    Install the EN-52446-2  Seal Protector (1) at the crankshaft.

  19. Install the 4 EN-52446-4  Stud (2).
  20. Install and hand tighten the 4 EN-52446-5  Nut (3).
  21. GM5145915Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Observe the locations for additional sealer (2) while applying the sealant path.
    • The bolts must be installed and fastened to final torque specification immediately after the component is installed.

    Clean all sealing surfaces.

  22. Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant
  23. Apply a 4.0 mm (0.158 in) bead of sealer along the timing chain lower cover sealing path (1), dimension a. Increase the bead to 6.0 mm (0.236 in) at the two locations (2), dimension b. Adhesives, Fluids, Lubricants, and Sealers
  24. GM5145917Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If service part comes with seal protector then use inner seal protector ring to slip the seal lip over the crankshaft snout, instead of EN-52446-2  Seal Protector.

    Align the timing chain lower cover (1) with the two transmission locating pins (2).

  25. Timing Chain Lower Cover (1) - Install
  26. Check that the crankshaft rear oil seal sits correctly on the crankshaft.
  27. Remove the EN-52446  Rear Crankshaft Seal Ring Tool (3).
  28. GM5389340Courtesy of GENERAL MOTORS COMPANY

    Timing Chain Cover Bolt (1, 2) - Install and hand tighten [16x]

  29. Timing Chain Cover Bolt - Tighten in sequence [16x] - Fastener Specifications
  30. Reposition hoses as needed.
  31. GM5137110Courtesy of GENERAL MOTORS COMPANY

    Install the EN-49979  Crankshaft Holder (1) with EN-956-1  Extension (3).

  32. GM5133550Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Flex Plate (1) - Install

  33. If NEW threaded components are being installed, loosen the adhesive using a metal pick or similar tool before proceeding. If threaded components are reused, prepare the threaded components using the following steps:
    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Apply thread locking adhesive to the external threads of the components. Adhesives, Fluids, Lubricants, and Sealers
    4. Ensure there are no gaps in the thread locking adhesive once applied to the component.
  34. Automatic Transmission Flex Plate Bolt (2) - Install NEW and hand tighten [8x]
  35. GM5647209Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

    Automatic Transmission Flex Plate Bolt (1) - Tighten in sequence [8x] - Fastener Specifications

  36. GM5137110Courtesy of GENERAL MOTORS COMPANY

    Remove the EN-49979  Crankshaft Holder (1) with EN-956-1  Extension (3).

  37. Transmission - Install - Automatic Transmission Removal and Installation (LM2, 4WD and NP0 without F47) , or Automatic Transmission Removal and Installation (LM2, 4WD and NQH without F47) , or Automatic Transmission Removal and Installation (LM2, 4WD and NP0 with F47) , or Automatic Transmission Removal and Installation (LM2, 4WD and NQH with F47)
  38. Fill the engine oil to the proper level with NEW engine oil. Engine Oil and Oil Filter Replacement
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