Cylinder Head Assemble

Special Tools

• EN-50717  Valve Spring Compressor
• EN-9666  Valve Spring Tester
• EN-43963  Valve Spring Compressor (off car)

For equivalent regional tools, refer to Special Tools .

1. Courtesy of GENERAL MOTORS COMPANY

   CAUTION:

   Refer to Component Fastener Tightening Caution .

   CAUTION:

   In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.

   Install NEW cylinder head plugs. Coat the plugs with sealer. Refer to Adhesives, Fluids, Lubricants, and Sealers .

2. Install the water jacket hole plugs (1) in the top of the cylinder head. Tighten the plugs to 50 N.m (37 lb ft).

3. Courtesy of GENERAL MOTORS COMPANY

   Install the oil gallery plug (1) in the rear of the cylinder head. Tighten the plug to 40 N.m (30 lb ft).

4. Inspect the valve springs for the following conditions:
   • Expanded height
   • Unparallel spring ends
   • Spring tension using EN-9666  tester
   • Any distorted springs should be replaced

5. Courtesy of GENERAL MOTORS COMPANY

   Inspect the valves and the valve seats. Refer to Valve and Seat Grinding .

6. Lubricate the valves. Refer to Adhesives, Fluids, Lubricants, and Sealers .
7. Install the valves (1, 2). Replace the valves, if required.

8. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   Always use NEW valve stem oil seals when assembling the cylinder head.

   Install the NEW valve seals (1). Fully seat the seals on the valve guides.

9. Courtesy of GENERAL MOTORS COMPANY

   Install the springs (1).

10. Courtesy of GENERAL MOTORS COMPANY

    WARNING:

    Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.

    CAUTION:

    Do not compress the valve springs to less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

    Install the retainers and keys using the following procedure:

    1. Install the retainer (2).
    2. Using the EN-50717  compressor and the EN-43963  adapter, compress the valve spring.
    3. Install the valve keys (1).
    4. Slowly release the compression from the valve/spring assembly.
    5. Inspect for proper valve key seating.

11. Courtesy of GENERAL MOTORS COMPANY

    Lubricate the camshaft position sensor O-ring with clean engine oil.

CAUTION:

Refer to Fastener Caution .

12. Install the exhaust camshaft position sensor (2) and bolt (1). Tighten the bolt to 10 N.m (89 lb in).

13. Courtesy of GENERAL MOTORS COMPANY

    Lubricate the camshaft position sensor O-ring with clean engine oil.

14. Install the intake camshaft position sensor (2) and bolt (1). Tighten the bolt to 10 N.m (89 lb in).