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Home >> Chevrolet >> 2021 >> Tahoe Z71 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions (8 Of 11) >> Repair Instructions >> Engine Replacement >> Installation Procedure

Installation Procedure

  1. GM5619710Courtesy of GENERAL MOTORS COMPANY

    Knock Sensor- Right Side (2) - Install

    2. CAUTION:

    Refer to Fastener Caution .

  2. Knock Sensor Bolt (1) - Install and tighten - Fastener Specifications
  3. GM5619689Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure proper use of room temperature vulcanizing (RTV) sealant.

    Apply sealant to the engine coolant heater (1) if equipped. Adhesives, Fluids, Lubricants, and Sealers

    4. CAUTION:

    Refer to Component Fastener Tightening Caution .

  4. { If equipped }Engine Coolant Heater (1) - Install and tighten - Fastener Specifications
  5. GM5619688Courtesy of GENERAL MOTORS COMPANY

    Knock Sensor- Left Side (2) - Install

  6. Knock Sensor Bolt (1) - Install and tighten - Fastener Specifications
  7. GM5619687Courtesy of GENERAL MOTORS COMPANY

    Knock Sensor Shield (2) - Install

  8. Knock Sensor Shield Bolt (1) - Install and tighten - Fastener Specifications
  9. GM5619659Courtesy of GENERAL MOTORS COMPANY

    Valve Rocker Arm Oil Control Valve Extension Harness (1) @Valve Rocker Arm Oil Control Valve Harness - Connect

  10. GM5619658Courtesy of GENERAL MOTORS COMPANY

    Engine Wiring Harness Bracket Bolt (1) - Install and tighten [2x] - Fastener Specifications

  11. GM5571633Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The 4 bank 2 fuel injector seals (1) should be clean and free of debris prior to installation.

    NOTE:

    Do NOT use any type of lubricant when installing the NEW 4 bank 2 fuel injector seals (1) on the fuel injector.

    Fuel Injector Seal (1) - Install NEW [4x]

  12. GM5044586Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The 8 bank 2 fuel injector nozzle housing seals (2) should be clean and free of debris prior to installation.

    NOTE:

    Do NOT use any type of lubricant when installing NEW 8 bank 2 fuel injector nozzle housing seals (2) on the fuel injector.

    Install the 8 bank 2 fuel injector nozzle housing seals (2) as follows:

    1. Install EN-51105-1  Injector Seal Installer and Sizer (3) onto the fuel injector tip, covering the first recessed area closest to the tip.
    2. Place a new seal (2) on the EN-51105-1  Injector Seal Installer and Sizer.
    3. Using EN-49245-3  Fuel Injection Seal Installer/Sizer (1), install the seal onto the second recessed area (4) of the fuel injector.
      4. NOTE:

      EN-49245-4  Fuel Injection Seal Installer/Sizer is two sided, and either direction will size the seal correctly.

    4. Compress the seal with your fingers, then size the seal using EN-49245-4  Fuel Injection Seal Installer/Sizer (5).
    5. GM5044590Courtesy of GENERAL MOTORS COMPANY
      NOTE:

      Do NOT use any type of lubricant when installing NEW fuel injector nozzle housing seals (2) on the injector.

      Install EN-51105-2  Injector Seal Installer and Sizer (3) onto the fuel injector tip.

    6. Place a NEW fuel injector nozzle housing seal (2) on EN-51105-2  Injector Seal Installer and Sizer.
    7. Using EN-49245-3  Fuel Injection Seal Installer/Sizer (1), install the fuel injector nozzle housing seal onto the first recessed area (4) of the fuel injector.
      8. NOTE:

      The EN-49245-4  Fuel Injection Seal Installer/Sizer is two sided, and either direction will size the seal correctly.

    8. Compress the seal with your fingers, then size the fuel injector nozzle housing seal using the EN-49245-4  Fuel Injection Seal Installer/Sizer (5).
  13. GM5585729Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The 4 bank 2 fuel injection fuel rail bolts (1) are retained into the fuel injection fuel rail (2). Care should be taken to ensure that the threadlocker is installed after the 4 bank 2 fuel injection fuel rail bolts (1) are installed to the bank 2 fuel injection fuel rail (2).

    Install the 4 fuel injection fuel rail bolts (1) to the bank 2 fuel injection fuel rail (2).

  14. Prepare the 4 bank 2 fuel injection fuel rail bolts (1) for installation as follows:
    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.
  15. Install the bank 2 fuel injection fuel rail (2) to the right cylinder head.
  16. Fuel Injection Fuel Rail Bolt (1) - Hand tighten [4x]
  17. Fuel Injection Fuel Rail Bolt (1) - Tighten [4x] - Fastener Specifications
  18. Connect the electrical wiring harness connectors to the bank 2 fuel injection fuel rail.
  19. GM5571633Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The 4 bank 1 fuel injector seals (1) should be clean and free of debris prior to installation.

    NOTE:

    Do NOT use any type of lubricant when installing the NEW 4 bank 1 fuel injector seals (1) on the fuel injector.

    Fuel Injector Seal (1) - Install NEW [4x]

  20. GM5044586Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The 8 bank 1 fuel injector nozzle housing seals (2) should be clean and free of debris prior to installation.

    NOTE:

    Do NOT use any type of lubricant when installing NEW 8 bank 1 fuel injector nozzle housing seals (2) on the fuel injector.

    Install the 8 bank 1 fuel injector nozzle housing seals (2) as follows:

    1. Install EN-51105-1  Injector Seal Installer and Sizer (3) onto the fuel injector tip, covering the first recessed area closest to the tip.
    2. Place a new seal (2) on the EN-51105-1  Injector Seal Installer and Sizer.
    3. Using EN-49245-3  Fuel Injection Seal Installer/Sizer (1), install the seal onto the second recessed area (4) of the fuel injector.
      4. NOTE:

      EN-49245-4  Fuel Injection Seal Installer/Sizer is two sided, and either direction will size the seal correctly.

    4. Compress the seal with your fingers, then size the seal using EN-49245-4  Fuel Injection Seal Installer/Sizer (5).
    5. GM5044590Courtesy of GENERAL MOTORS COMPANY
      NOTE:

      Do NOT use any type of lubricant when installing NEW fuel injector nozzle housing seals (2) on the injector.

      Install EN-51105-2  Injector Seal Installer and Sizer (3) onto the fuel injector tip.

    6. Place a NEW fuel injector nozzle housing seal (2) on EN-51105-2  Injector Seal Installer and Sizer.
    7. Using EN-49245-3  Fuel Injection Seal Installer/Sizer (1), install the fuel injector nozzle housing seal onto the first recessed area (4) of the fuel injector.
      8. NOTE:

      The EN-49245-4  Fuel Injection Seal Installer/Sizer is two sided, and either direction will size the seal correctly.

    8. Compress the seal with your fingers, then size the fuel injector nozzle housing seal using the EN-49245-4  Fuel Injection Seal Installer/Sizer (5).
  21. GM5575823Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The 4 bank 1 fuel injection fuel rail bolts (1) are retained into the fuel injection fuel rail (2). Care should be taken to ensure that the threadlocker is installed after the 4 bank 1 fuel injection fuel rail bolts (1) are installed to the bank 1 fuel injection fuel rail (2).

    Install the 4 fuel injection fuel rail bolts (1) to the bank 1 fuel injection fuel rail (2).

  22. Prepare the 4 bank 1 fuel injection fuel rail bolts (1) for installation as follows:
    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.
  23. Install the bank 1 fuel injection fuel rail (2) to the left cylinder head.
  24. Fuel Injection Fuel Rail Bolt (1) - Hand tighten [4x]
  25. Fuel Injection Fuel Rail Bolt (1) - Tighten [4x] - Fastener Specifications
  26. Connect the electrical wiring harness connectors to the bank 1 fuel injection fuel rail.
  27. GM5026400Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The camshaft must be in the base circle position before the fuel pump is installed.

    Using EN-51092  Fuel Pump Installation Gauge (2) ensure that the camshaft lobe is in the base circle position. At base circle position, the EN-51092  Fuel Pump Installation Gauge (2) will be flush with the top surface of the lifter oil manifold assembly (1).

  28. GM5568498Courtesy of GENERAL MOTORS COMPANY

    Ensure the 2 plastic fastener retainers (3) are installed in the fuel pump mounting holes before installing the fuel pump.

  29. Fuel Pump Bracket Gasket (5) - Install NEW
    30. NOTE:

    Ensure that the fuel pump roller lifter is oriented properly, the camshaft is at base circle and the number 1 piston is at top dead center (TDC) on the exhaust stroke.

  30. Fuel Pump (4) - Install
  31. Fuel Pump Cover (2) - Install
    32. CAUTION:

    Alternately hand-tighten the fuel pump bolts one turn at a time until the pump is fully seated. Trying to draw down the pump without even side-to-side tightening may result in pump plunger damage.

  32. Fuel Pump Bolt (1) - Install and hand tighten [2x]
  33. Fuel Pump Bolt (1) - Tighten [2x] - Fastener Specifications
  34. Reposition the fuel pump and fuel injector wiring harness and connect as necessary.
  35. GM5614523Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT reuse the fuel feed intermediate pipe (1). If the 2 fuel feed intermediate pipe nuts (3) are loosened or the fuel feed intermediate pipes are removed, the fuel feed intermediate pipes MUST be replaced.

    Fuel Feed Intermediate Pipe (1) - Install NEW

    1. Slide the 2 fuel feed intermediate pipe nuts (3) back along fuel feed intermediate pipe (1) to reveal the 2 formed ends (2) of the fuel feed intermediate pipe (1).
    2. Carefully install the 2 formed ends (2) of the fuel feed intermediate pipe (1) into the sockets of the left and right fuel injection fuel rail. Take care not to hit the 2 formed ends (2) of the fuel feed intermediate pipe (1) on the threaded sockets on the fuel injection fuel rails.
    3. Hold the fuel feed intermediate pipe (1) firmly in place and hand tighten the 2 fuel feed intermediate pipe nuts (3).
  36. Fuel Feed Pipe Bolt (4) - Tighten - Fastener Specifications
  37. Fuel Feed Intermediate Pipe Nut (3) - Tighten [2x] - Fastener Specifications
  38. GM5608922Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT reuse the fuel feed intermediate pipe (1). If the 2 fuel feed intermediate pipe nuts (2) are loosened or the fuel feed intermediate pipes are removed, the fuel feed intermediate pipes MUST be replaced.

    Fuel Feed Intermediate Pipe (1) - Install NEW

    1. Slide the 2 fuel feed intermediate pipe nuts (2) back along fuel feed intermediate pipe (1) to reveal the 2 formed ends (3) of the fuel feed intermediate pipe (1).
    2. Carefully install the 2 formed ends (3) of the fuel feed intermediate pipe (1) into the sockets of the fuel pump (4) and the fuel feed intermediate pipe (5). Take care not to hit the 2 formed ends (3) of the fuel feed intermediate pipe (1) on the threaded sockets of the fuel pump (4) and fuel feed intermediate pipe (5).
    3. Hold the fuel feed intermediate pipe (1) firmly in place and hand tighten the 2 fuel feed intermediate pipe nuts (2).
  39. Fuel Feed Intermediate Pipe Nut (2) - Tighten [2x] - Fastener Specifications
  40. GM5619423Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Gasket (1) - Install NEW

  41. Exhaust Manifold- Right Side (3) - Install
  42. Exhaust Manifold Bolt (2) - Install NEW and hand tighten [5x]
  43. Exhaust Manifold Bolt (2) - Tighten [5x] - Fastener Specifications
  44. GM5619422Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Heat Shield - Right Side (2) - Install

  45. Exhaust Manifold Heat Shield Bolt (1) - Install and tighten [3x] - Fastener Specifications
  46. GM5619368Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator Seal (2) - Install NEW

  47. Install the oil level indicator, oil level indicator tube and oil level indicator seal as an assembly (1)
  48. GM5619366Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator Tube Bolt (1) - Install and tighten - Fastener Specifications

  49. GM5619338Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Gasket (1) - Install NEW

  50. Exhaust Manifold- Left Side (3) - Install
  51. Exhaust Manifold Bolt (2) - Install NEW and hand tighten [5x]
  52. Exhaust Manifold Bolt (2) - Tighten [5x] - Fastener Specifications
  53. GM5619337Courtesy of GENERAL MOTORS COMPANY

    Exhaust Manifold Heat Shield - Left Side (2) - Install

  54. Exhaust Manifold Heat Shield Bolt (1) - Install and tighten [3x] - Fastener Specifications
  55. GM5550107Courtesy of GENERAL MOTORS COMPANY

    Ignition Coil (2) - Install [4x]

  56. Ignition Coil Bolt (1) - Install and tighten [8x] - Fastener Specifications
  57. Connect the ignition coil electrical connectors.
  58. GM5549185Courtesy of GENERAL MOTORS COMPANY

    Inspect the inside of the spark plug rubber boots for a thin, even coat of grease. If there is no grease present or additional grease is necessary, apply a thin coating of dielectric grease evenly to the inside of the spark plug rubber boots up to a depth of 15 mm from the end of the boots. Adhesives, Fluids, Lubricants, and Sealers

  59. Push the 4 boots of the spark plug wires (1) onto the 4 ignition coils (2) until 2 audible clicks are heard.
  60. GM5541819Courtesy of GENERAL MOTORS COMPANY

    Push the 4 boot of the spark plug wires (1) onto the 4 gas engine ignition spark plugs (2) until 2 audible clicks are heard.

  61. GM5550055Courtesy of GENERAL MOTORS COMPANY

    Ignition Coil (2) - Install [4x]

  62. Ignition Coil Bolt (1) - Install and tighten [8x] - Fastener Specifications
  63. Connect the ignition coil electrical connectors.
  64. GM5549185Courtesy of GENERAL MOTORS COMPANY

    Inspect the inside of the spark plug rubber boots for a thin, even coat of grease. If there is no grease present or additional grease is necessary, apply a thin coating of dielectric grease evenly to the inside of the spark plug rubber boots up to a depth of 15 mm from the end of the boots. Adhesives, Fluids, Lubricants, and Sealers

  65. Push the 4 boots of the spark plug wires (1) onto the 4 ignition coils (2) until 2 audible clicks are heard.
  66. GM5541819Courtesy of GENERAL MOTORS COMPANY

    Push the boot of the 4 spark plug wires (1) onto the 4 gas engine ignition spark plugs (2) until 2 audible clicks are heard.

  67. GM5619274Courtesy of GENERAL MOTORS COMPANY

    Valve Rocker Arm Cover Insulator (3) - Install

  68. Install the 3 upper intake manifold sight shield grommets (1) to the 3 valve rocker arm cover insulator retainers (2).
  69. GM5619273Courtesy of GENERAL MOTORS COMPANY

    Valve Rocker Arm Cover Insulator (3) - Install

  70. Install the 3 upper intake manifold sight shield grommets (2) to the 3 valve rocker arm cover insulator retainers (1).
  71. GM5536367Courtesy of GENERAL MOTORS COMPANY

    Lubricate the oil filler tube seal (2) with clean engine oil. Adhesives, Fluids, Lubricants, and Sealers

  72. GM5536366Courtesy of GENERAL MOTORS COMPANY

    Install the oil filler tube (1) to the valve rocker arm cover and rotate clockwise to install.

  73. GM5619113Courtesy of GENERAL MOTORS COMPANY

    Install the belt idler pulley and belt idler pulley bracket (2) as an assembly.

  74. Belt Idler Pulley Bracket Bolt (1) - Install and tighten [3x] - Fastener Specifications
  75. GM5619486Courtesy of GENERAL MOTORS COMPANY

    Engine Mount- Left Side (2) - Install

  76. Prepare the 4 engine mount engine side bolts for installation as follows:
    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.
  77. Engine Mount Engine Side Bolt- Left Side (1) - Install and hand tighten [4x]
  78. Engine Mount Engine Side Bolt- Left Side (1) - Tighten [4x] - Fastener Specifications
  79. GM5619488Courtesy of GENERAL MOTORS COMPANY

    Engine Mount- Right Side (2) - Install

  80. Prepare the 4 engine mount engine side bolts (1) for installation as follows:
    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.
  81. Engine Mount Engine Side Bolt- Right Side (1) - Install and hand tighten [4x]
  82. Engine Mount Engine Side Bolt- Right Side (1) - Tighten [4x] - Fastener Specifications
  83. GM5619108Courtesy of GENERAL MOTORS COMPANY

    EN-42386-A  Flywheel Holding Tool (1) - Install

  84. Install 1 M10-1.5 x 120 mm (3) bolt and 1 M10-1.5 x 45 mm bolt (2).
  85. Tighten the 2 bolts (2, 3) to 50 N.m (37 lb ft).
  86. GM5619302Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The automatic transmission flex plate does not use a locating pin for alignment and will not initially seat against the crankshaft flange, but will be pulled onto the crankshaft by the automatic transmission flex plate bolts. This procedure requires a 3 stage tightening process.

    Automatic Transmission Flex Plate (1) - Install

  87. GM5619300Courtesy of GENERAL MOTORS COMPANY

    Due to the unknown shelf life of the adhesive patch, prepare the 8 NEW automatic transmission flex plate bolts (1) as follows:

    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.
    88. 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.

  88. Automatic Transmission Flex Plate Bolt (1) - Install NEW and hand tighten [8x]
  89. Automatic Transmission Flex Plate Bolt (1) - Tighten in sequence [8x] - Fastener Specifications
  90. GM5619297Courtesy of GENERAL MOTORS COMPANY

    Remove the M10-1.5 x 120 mm bolt (3) and the M10-1.5 x 45 mm bolt (2).

  91. EN - 42386-A  Flywheel Holding Tool (1) - Remove
  92. GM5053741Courtesy of GENERAL MOTORS COMPANY

    Install EN-36857  Engine Lift Bracket (1) using EN-52059  Engine Support Fixture Adapter Bolt - M10 (2) to the cylinder head as shown.

  93. GM5053735Courtesy of GENERAL MOTORS COMPANY

    Install EN-36857  Engine Lift Bracket (1) using EN-52059  Engine Support Fixture Adapter Bolt - M10 (2) to the cylinder head as shown.

  94. Install a suitable chain to the two engine lift brackets to support the engine.
  95. GM5587488Courtesy of GENERAL MOTORS COMPANY

    Using a suitable engine lifting device, remove the engine (1) from the engine stand (2). Engine Removal and Installation (L84, 4WD, with WTX, without F47) , or Engine Removal and Installation (L84, 2WD, with WTX, without F47) , or Engine Removal and Installation (L84, 4WD, with RC1, without F47) , or Engine Removal and Installation (L84, 2WD, with RC1, with F47) Engine Removal and Installation (L84, 4WD, with RC1, with F47) , or Engine Removal and Installation (L84, 4WD, with WTX, with F47) , or Engine Removal and Installation (L84, 2WD, with RC1, without F47) , or Engine Removal and Installation (L84, 2WD, with WTX, with F47) , or Engine Removal and Installation (L87, 2WD, with RC1, with F47) , or Engine Removal and Installation (L87, 4WD, with RC1, with F47) , or Engine Removal and Installation (L87, 2WD, with RC1, without F47) , or Engine Removal and Installation (L87, 4WD, with RC1, without F47) , or Engine Removal and Installation (L87, 2WD, with WTX, with F47) , or Engine Removal and Installation (L87, 4WD, with WTX, with F47) , or Engine Removal and Installation (L87, 2WD, with WTX, without F47) , or Engine Removal and Installation (L87, 4WD, with WTX, without F47)

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