Tools Required

J 8062  Valve Spring Compressor

1. Clean the cylinder head valve spring seat and/or shim area.
   IMPORTANT: When using the valves and related components again, install the parts to their original location.
2. Install the valves (9 and 10) into the proper guides. Refer to Separating Parts .
   IMPORTANT: The valve stem oil seal alignment and position on the valve guide is critical.

   An improperly installed valve stem oil seal may lead to excessive oil consumption, increased vehicle emissions, or component damage.

3. Install the valve stem oil seal and shim assembly (5).
4. Install the valve spring (4).
5. Install the valve spring cap (3).
   Fig 1: Cylinder Head & Components

   Courtesy of GENERAL MOTORS CORP.
6. Compress the valve spring using the J 8062  .
7. Install the valve stem keys.
   1. 7.1. Use grease to hold the keys in place and remove the J 8062  .
   2. 7.2. Make sure the keys seat properly in the groove of the valve stem.
   3. 7.3. Tap the end to the valve stem with a plastic faced hammer to seat the keys, if necessary.
   Fig 2: Compressing Valve Spring Using J 8062

   Courtesy of GENERAL MOTORS CORP.
8. Measure the valve spring installed height using a ruler. Measure from the base of the spring to the top of the spring.

   If the installed height exceeds 46.25 mm (1.82 in), install a valve seat spring shim of approximately 0.5 mm (0.02 in) thick.

   Do not shim the valve spring to obtain less than the specified height.

   Do not assemble the components without a spring shim on the cylinder head, aluminum head.

9. Install the remaining valves, springs, and other components.
   Fig 3: Measuring Valve Spring Installed Height

   Courtesy of GENERAL MOTORS CORP.
10. Install sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the coolant sensor.
    NOTE: Refer to FASTENER NOTICE .
11. Install the coolant sensor into the left cylinder head.

    Tighten 

    Tighten the coolant sensor to 20 N.m (15 lb ft).

    Fig 4: Installing Coolant Sensor Into Left Cylinder Head

    Courtesy of GENERAL MOTORS CORP.
12. Install the coolant plug to the right cylinder head.

    Tighten 

    Tighten the coolant plug to 20 N.m (15 lb ft).

    Fig 5: Installing Coolant Plug To Right Cylinder Head

    Courtesy of GENERAL MOTORS CORP.
13. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the sides of the cylinder head expansion plugs (1), if applicable.
14. Install the expansion plugs into the cylinder head, aluminum head.

    A properly installed plug should be slightly below flush with the face of the head.

    Fig 6: Installing Expansion Plugs

    Courtesy of GENERAL MOTORS CORP.