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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions (11 Of 11) >> Repair Instructions >> Piston and Connecting Rod Overhaul >> Assemble Procedure

Assemble Procedure

  1. GM2911745Courtesy of GENERAL MOTORS COMPANY

    Piston- Right Side

    • The arrow on top of the piston (1) and the dimple (2) on the rod face the same direction.
    • When installing the right side piston and rod (3) assemblies, the arrow on top of the piston and the dimple (2) on the rod face the front of the engine.
    • The raised bump (4) on bottom of rod (3) will be closest to the outside of the engine.
  2. GM2911746Courtesy of GENERAL MOTORS COMPANY

    Piston- Left Side

    • The arrow on top of the piston (1) and the dimple on the rod face the opposite direction.
    • When installing the left side piston and rod (2) assemblies, the arrow on top of the piston faces the front of the engine and the dimple on the rod faces the rear of the engine.
    • The raised bump (3) on the bottom of rod will be closest to the outside of engine.
  3. GM5366803Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • The piston is directional and must be installed in the engine block in the proper direction. The arrow on the top of the piston must face the front of the engine.
    • The piston is model dependent and may not appear exactly as shown.

    Lubricate the piston pin bores in the piston (1) and the connecting rod (2) with clean engine oil. Adhesives, Fluids, Lubricants, and Sealers

  4. GM5580166Courtesy of GENERAL MOTORS COMPANY

    Assemble the piston (3) and piston pin (2) to the connecting rod (4). Properly orient the piston when reusing a marked connecting rod.

  5. Align the piston pin bore with the connecting rod pin bore.
  6. Slide the piston pin (1) into the piston (3) and the connecting rod (4).
    7. NOTE:

    New piston pin retainers must be used. Never reuse the piston pin retainers.

  7. Install NEW piston pin retainers (1) using the EN-46745  Piston Pin Clip Remover/Installer (5). Align the EN-46745  Piston Pin Clip Remover/Installer (5) to the notch in the piston.
  8. GM5366785Courtesy of GENERAL MOTORS COMPANY

    Ensure that the piston pin retainers (1) are fully seated in their grooves.

  9. Repeat these procedures for the remaining pistons.

Piston Ring Installation Procedure

  1. GM5366804Courtesy of GENERAL MOTORS COMPANY

    Properly orient the piston oil ring rail spacer (1) expander as shown before installation. The ends of the piston oil ring rail spacer must be facing toward the top of the piston.

  2. GM2969654Courtesy of GENERAL MOTORS COMPANY

    The piston compression upper ring and piston compression lower rings have either a dimple (1) or the word "TOP" (2) on the top side of the ring. The rings should be installed so that either of these marks are facing the top of the piston.

  3. GM5366783Courtesy of GENERAL MOTORS COMPANY

    Using a piston ring expander, install the piston oil ring rail assembly using the following procedure:

    1. Install the piston oil ring rail (4). Expand the rings only enough to clear the piston diameter. Overexpanding the piston rings will distort or crack the rings.
    2. Install the piston oil ring rail spacer (3).
    3. Install the piston oil ring rail (4). Expand the rings only enough to clear the piston diameter. Overexpanding the piston rings will distort or crack the rings.
    4. NOTE:

    The piston compression lower ring (2) is thicker and will not fit in the piston compression upper ring (1) position.

  4. Install the piston compression lower ring (2) onto the piston with the mark facing the top of the piston.
  5. Install the piston compression upper ring (1) onto the piston with the mark facing the top of the piston, if required.
  6. GM6250455Courtesy of GENERAL MOTORS COMPANY

    Once the rings are installed, set the ring gaps for the piston rings as follows. Use the piston location arrow for reference.

    1. Piston Oil Ring Rail- Lower (1)
    2. Piston Oil Ring Rail Spacer (2)
    3. Piston Oil Ring Rail- Upper (3)
    4. Piston Compression Lower Ring (4)
    5. Piston Compression Upper Ring (5)
  7. Position the piston oil ring rail (1 and 3) end gaps a minimum of 25 mm (1.0 in) from each other along the outside diameter of the piston.
  8. Position the piston compression ring (4 and 5) end gaps 180 degrees opposite each other.

Connecting Rod Bearing Installation Procedure

  1. GM5366807Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If the connecting rod bearings have been used in a running engine, you must replace them with NEW connecting rod bearings for reassembly.

    Clean the connecting rod (2) and the connecting rod cap bearing bore with a lint-free cloth.

  2. Clean all the oil from behind the connecting rod bearing halves.
  3. Install NEW upper connecting rod bearing (1) into position. Roll the bearing into position so that the lock tang engages the alignment slot. The bearing must fit flush in the connecting rod.
  4. Install the EN-41556  Connecting Rod Guide (3) into the connecting rod bolt holes.
  5. GM1313743Courtesy of GENERAL MOTORS COMPANY

    Install NEW lower connecting rod bearing (1) into position in the connecting rod cap (2). Roll the bearing into position so that the lock tang engages the alignment slot. The bearings must fit flush with the connecting rod cap.

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