Cylinder Head Disassemble

Special Tools

• EN-840  Pliers/Remover
• EN-8062  Valve Spring Compressor
• EN-8062-5  Adapter
• EN-50717-2  Compressor Assembly of EN-50717  Kit

For equivalent regional tools, refer to Special Tools .

Fig 1: Valve Spring Compressor And Adapter Assembly
Courtesy of GENERAL MOTORS COMPANY
1. Install the EN-50717-2  assembly (1) to the EN-8062  compressor (4).
2. Install the EN-8062-5  adapter (3) to the EN-8062  compressor.
3. Install the compressor assembly to the cylinder head, so that the adapter (5) of the EN-50717-2  assembly (1) contacts the valve spring retainer properly and the EN-8062-5  adapter (3) contacts the valve disc (2). Prefix the EN-8062  compressor (4).
Fig 2: Valve Spring Retainer And Valve Spring
Courtesy of GENERAL MOTORS COMPANY
WARNING:

Valve springs can be tightly compressed. Use care when removing the retainers and plugs. Personal injury could result.

4. Apply pressure to the EN-50717-2  assembly to push down the vale spring retainer (1) and compress the valve spring (3) until the valve keys (2) are free from tension. Carefully remove the valve keys.
Fig 3: Spring Compressor
Courtesy of GENERAL MOTORS COMPANY
5. Slowly and carefully loosen the EN-50717-2  assembly until the valve spring is entirely expanded.
6. Remove the compressor assembly from the cylinder head.
7. Remove the valve spring retainer (1) and the valve spring (3).
8. Remove and DISCARD the valve stem oil seal (4), using the EN-840  pliers (2).
9. Remove the valve (5).
NOTE:

Ensure that the valve train components are kept together and identified in order for proper installation in their original position.

10. Repeat the procedure with the remaining valves.
11. In case of re-using the cylinder head, refer to Cylinder Head Cleaning and Inspection .