Piston and Connecting Rod Assemble

Tools Required 

EN-46745  Piston Pin Retainer Remover and Installer

Fig 1: "Cast Boss" Underside of Piston

Courtesy of GENERAL MOTORS CORP.

1. The cast boss (1), on the underside of the piston, must go to the rear of the block.
Fig 2: Identifying Front Side Of Connecting Rod
Courtesy of GENERAL MOTORS CORP.
2. The larger feature (1), at the split line located on one side of the connecting rod, must go to the front of the block.
Fig 3: Exploded View Of Piston & Connecting Rod Assembly
Courtesy of GENERAL MOTORS CORP.
3. Assemble the connecting rod and the piston.
   Fig 4: Piston Pin Clip Remover & Installer

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Install the piston pin retainers correctly in the retaining groove during assembly in order to avoid engine damage.
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 piston pin retainer into the retaining groove using EN-46745 . 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 piston pin retainer, using EN-46745 .
   5. Ensure that the piston moves freely.
   Fig 5: Exploded View Of Piston Rings

   Courtesy of GENERAL MOTORS CORP.
   NOTE: 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 (bottom ring):
   1. The expander
   2. The lower oil control ring
   3. The upper control ring
6. Install the lower compression ring (second ring). Place the manufacturer's mark facing up.
7. Install the upper compression ring (top ring).