Cylinder Head Disassemble

Special Tools

• EN-43963  Valve Spring Compressor (off car)
• EN-46116  Valve Stem Seal Remover/Installer
• EN-50717  Valve Spring Compressor

For equivalent regional tools, refer to Special Tools .

1. Remove the intake camshaft position sensor (2) and bolt (1).
   Fig 1: Intake Camshaft Position Sensor And Bolt

   Courtesy of GENERAL MOTORS COMPANY
2. Remove the exhaust camshaft position sensor (2) and bolt (1).
   Fig 2: Exhaust Camshaft Position Sensor And Bolt

   Courtesy of GENERAL MOTORS COMPANY
3. Perform the following procedure to remove the valve keys, springs and retainers:
   Fig 3: Valve Keys, Springs And Retainers

   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.
   NOTE: Ensure that the valve train components are kept together and identified in order for proper installation in their original position.
   1. Using the EN-50717  fixture and the EN-43963  compressor adapter, compress the valve spring.
   2. Remove the valve keys (1).
   3. Slowly release the compression from the valve spring assembly.
   4. Remove the retainer (2).
4. Remove the springs (1).
   Fig 4: Valve Springs

   Courtesy of GENERAL MOTORS COMPANY
5. Using EN-46116  remover, remove the valve seals (1). Discard the seals, do not reuse.
   Fig 5: Valve Seals

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: Do not damage the valve guide. Remove any burrs that have formed at the key groove by chamfering the valve stem with an oil stone or a file.
6. Remove the valves (1, 2).
   Fig 6: Valves

   Courtesy of GENERAL MOTORS COMPANY
7. Remove the cylinder head plug (1).
   Fig 7: Cylinder Head Plug

   Courtesy of GENERAL MOTORS COMPANY
8. Remove the cylinder head plugs (1).
   Fig 8: Cylinder Head Plugs

   Courtesy of GENERAL MOTORS COMPANY