Piston and Connecting Rod Assemble

Special Tools

• EN-46745  Piston Pin Clip Remover/Installer
• EN-46745-4  Piston Pin Clip Remover/Installer Adapter

For equivalent regional tools, refer to Special Tools .

Fig 1: Connecting Rod And Piston
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Install the piston onto the connecting rod with the arrow on top of the piston oriented to the same side as the cast feature at the split line of the connecting rod.

1. The arrow (1), on the top of the piston, must go to the front of the block.
2. The feature at the split line (4), located on one side of the connecting rod, must go to the front of the block.
3. Assemble the connecting rod (3) and the piston (2).
Fig 2: View of Piston Pin Retainers
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

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

NOTE:

Use NEW retainers.

4. Use the following procedure to assemble the piston pin and the retainer:
   1. Coat the piston pin with oil.
   2. Install one side of one NEW piston pin retainer into the retaining groove using EN-46745  installer and EN-46745-4  adapter. Rotate the retainer until it is fully seated in the groove.
   3. Install the connecting rod and the piston pin.

      Push the piston pin until it bottoms in the previously installed retainer.

   4. Install the second NEW piston pin retainer, using EN-46745  installer (1) and EN-46745-4  adapter.
   5. Ensure that the piston moves freely.
Fig 3: Piston Rings
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

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

5. Install the following components of the oil control ring assembly:
   1. The piston oil ring rail (5)
   2. The piston oil ring rail spacer (4)
   3. The second piston oil ring rail (3)
6. Install the piston lower compression ring (2). Place the manufacturer's mark facing up.
7. Install the piston upper compression ring (1).