GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Piston and Connecting Rod Assemble

Press-Fit Piston Pin

    Object Number: 1310003 Size: SH

    Important: 

       • The piston and connecting rod are to be serviced as an assembly. If a new piston or connecting rod is required, a complete piston/connecting rod assembly must be used.
       • New connecting rod nuts must be used during assembly.

  1. Install the piston rings (121) onto the piston.

    2. Object Number: 562836 Size: SH

    Notice: Use a piston ring expander to install the piston rings. The rings may be damaged if expanded more than necessary.

  2. Install the lower oil control piston ring spacer onto the piston.

    3. Object Number: 562842 Size: SH
  3. Install the lower oil control piston ring onto the piston (1).

    4. Object Number: 562839 Size: SH
  4. Install the upper oil control piston ring onto the piston (1).

    5. Object Number: 562848 Size: SH
  5. Space the oil control piston ring end gaps a minimum of 90 degrees apart (1, 2, 3).

    6. Object Number: 562823 Size: SH
  6. Install the lower compression piston ring onto the piston (1). The mark on the side of the piston ring should face the top of the piston.

    7. Object Number: 562819 Size: SH
  7. Install the upper compression piston ring onto the piston. The mark (1) on the side of the piston ring should face the top of the piston.
  8. Space the compression piston ring end gaps 120 degrees apart.

Full-Floating Piston Pin

    Object Number: 1366372 Size: SH

    Notice: Install the piston pin retainers correctly in the retaining groove during assembly in order to avoid engine damage.

  1. Install the retaining clip. The clip should be seated in the groove of the pin bore.

    2. Object Number: 35866 Size: SH
  2. Lubricate the pin and pin bore with clean engine oil.
  3. Install the piston pin to the piston and connecting rod.
  4. Install the retaining clip. The clip should be seated in the groove of the pin bore. Ensure the pin moves freely within the piston pin bore.

    5. Object Number: 490763 Size: SH

    Notice: Use a piston ring expander to install the piston rings. The rings may be damaged if expanded more than necessary.

  5. Using piston ring pliers, install the piston rings onto the piston.

    6. Object Number: 562836 Size: SH
  6. Install the lower oil control piston ring spacer onto the piston.

    7. Object Number: 562842 Size: SH
  7. Install the lower oil control piston ring onto the piston (1).

    8. Object Number: 562839 Size: SH
  8. Install the upper oil control piston ring onto the piston (1).

    9. Object Number: 562848 Size: SH
  9. Position the oil control piston ring end gaps a minimum of 90 degrees apart (1, 2, 3).

    10. Object Number: 562823 Size: SH
  10. Install the lower compression piston ring onto the piston. The mark (1) on the side of the piston ring should face the top of the piston.

    11. Object Number: 562819 Size: SH
  11. Install the upper compression piston ring onto the piston. The mark (1) on the side of the piston ring should face the top of the piston.
  12. Position the compression ring end gaps 120 degrees apart.

    13. Object Number: 1366359 Size: SH
  13. Install the connecting rod bearings (3) to the rod (2) and cap (4).