Piston and Connecting Rod Assemble (LDK, LHU)

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 (LDK, LHU) .

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

Install the piston onto the connecting rod with the arrow oriented toward the front of the engine.

1. Assemble the connecting rod (2) and the piston (1).
Fig 2: Piston Pin Retainer Removal Tool
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

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

2. Use the following procedure to assemble the piston pin and the retainer:
   1. Coat the piston pin with oil.
   2. Using the EN-46745  installer (1) and the EN-46745-4  adapter, install one side of one piston pin retainer into the retaining groove. 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. Using the EN-46745  installer and the EN-46745-4  adapter, install the second piston pin retainer.
   5. Ensure that the piston moves freely.
Fig 3: Identifying 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.

3. Install the following components of the oil control ring assembly - bottom ring (6):
   1. The expander (5)
   2. The lower oil control ring (4)
   3. The upper control ring (3)
4. Install the lower compression ring - second ring (2). Place the manufacturer's mark facing up.
5. Install the upper compression ring - top ring (1).