Cylinder Head Assemble

Special Tools

• EN-958  Valve Stem Seal Installer
• 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 Stem Oil Seal And Installer
Courtesy of GENERAL MOTORS COMPANY
1. Lubricate the valve stem and the valve guide with clean engine oil.
NOTE:

Ensure all valve train components will be installed in their original position.

2. Install the valve (5).
3. Install the NEW valve stem oil seal (4), using the EN-958  installer (2).
4. Loosely install the valve spring (3) and the valve spring retainer (1).
Fig 2: Valve Spring Compressor And Adapter Assembly
Courtesy of GENERAL MOTORS COMPANY
5. Install the EN-50717-2  assembly (1) to the EN-8062  compressor (4).
6. Install the EN-8062-5  adapter (3) to the EN-8062  compressor.
7. 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 3: Valve Spring Retainer And Valve Spring
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

The valve stem keys must correctly seat in the valve spring cap. Engine damage may occur by not installing properly.

8. 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) can be inserted. Carefully insert the valve keys then, so that they are proper installed to the valve stem grooves.
9. Carefully release the tension from the EN-50717-2  assembly.
10. Inspect the valve keys and valve spring retainers for proper seat.
11. Remove the compressor assembly from the cylinder head.
12. Repeat the procedure with the remaining valves.