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Piston And Connecting Rod Assemble

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Special Tools 

EN - 46745  Piston Pin Clip Remover/Installer

For equivalent regional tools, refer to Special Tools .

  1. Lubricate the piston pin bores in the piston, the piston pin, and the connecting rod pin bore with clean engine oil.
    2. Fig 1: Piston and Connecting Rod
    GM2911745Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The left side and right side piston and rod assemblies are assembled differently.

  2. Ensure that on the right side piston and rod assemblies, the arrow on the top of the piston (1) and the dimple on the rod (2) are facing the same direction.
    3. Fig 2: Top Of Piston And Dimple On Rod
    GM2911746Courtesy of GENERAL MOTORS COMPANY
  3. Ensure that on the left side piston and rod assemblies, the arrow on the top of the piston (1) and the dimple on the rod (2) are facing the opposite direction.
    4. Fig 3: Piston Pin
    GM2969651Courtesy of GENERAL MOTORS COMPANY
  4. Install the piston pin (1) to the piston and connecting rod.
    5. Fig 4: NEW Piston Pin Retainers Using Special Tool Remover/Installer
    GM2969652Courtesy of GENERAL MOTORS COMPANY
    NOTE:

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

  5. Install NEW piston pin retainers using the EN-46745  remover/installer. Align the EN-46745  remover/installer to one of the notches (1) in the piston.
    6. Fig 5: Piston Rings And Piston Ring Pliers
    GM3287521Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    When installing piston rings, use a ring expander plier type tool. Do not roll the rings into the grooves of the piston. Use caution and care to expand the rings only slightly larger than the outside diameter (OD) of the piston.

  6. Using piston ring pliers, install the piston rings onto the piston.
  7. Position the oil control ring end gaps 180 degrees opposite each other.
    8. Fig 6: Positioning Compression Ring End Gaps 180 Degrees Opposite Each Other
    GM2969654Courtesy of GENERAL MOTORS COMPANY
    Fig 7: Positioning Compression Ring End Gaps 180 Degrees Opposite Each Other
    GM2969656Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • The upper compression ring has a dimple on the top of the ring. The dimple on upper compression ring should face the top of the piston.
    • The lower compression ring has a groove on the bottom of the ring. The groove on the lower compression ring should face the bottom of the piston.
  8. Position the compression ring end gaps 180 degrees opposite each other.
    9. Fig 8: View Of Piston, Connecting Rod & Bearing Assembly
    GM1552501Courtesy of GENERAL MOTORS COMPANY
  9. Install the connecting rod bearings to the rod and cap.
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