Cylinder Head Assemble

Tools Required 

• J 8062  Valve Spring Compressor
• J 42078  Valve Stem Oil Seal Installer

1. Clean the cylinder head valve spring seat and/or shim area.
   IMPORTANT: When reusing the valves and related components, install the parts to their original location.
2. Install the valves (11 and 13) into the proper guides. Refer to Separating Parts .
3. Install the valve spring shim (7), first design.
4. Install the valve stem oil seal and shim assembly, second design.

   J 42078  is not required for installation of the second design seal and shim assembly. A separate spring shim is not required with the second design seal and shim assembly.

   Fig 1: Valve Components

   Courtesy of GENERAL MOTORS CORP.
   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.

5. Install the valve stem oil seal, first design, onto the guide.
   1. 5.1. Lubricate the valve guide and valve stem oil seal with clean engine oil.
   2. 5.2. Install the valve stem oil seal, first design, onto the valve stem. Push the seal down until the seal contacts the valve guide.
   3. 5.3. Use the J 42078  in order to install the valve stem oil seal.

      Push or lightly tap the tool until the tool bottoms against the valve spring shim.

   Fig 2: Installing Valve Stem Oil Using J 42078

   Courtesy of GENERAL MOTORS CORP.
6. Measure the valve stem oil seals, first design, for the properly installed height.

   There should be a 18.1-19.1 mm (0.712-0.752 in) gap between the top edge of the oil seal body and the valve spring shim surface.

   Fig 3: Measuring Valve Stem Oil Seals

   Courtesy of GENERAL MOTORS CORP.
7. Install the valve spring (5).
8. Install the valve spring cap (4).
   Fig 4: Valve Components

   Courtesy of GENERAL MOTORS CORP.
9. Compress the valve spring using the J 8062. 
10. Install the valve stem keys.
    1. 10.1. Use grease to hold the keys in place and remove the J 8062. 
    2. 10.2. Make sure the keys seat properly in the groove of the valve stem.
    3. 10.3. Tap the end to the valve stem with a plastic faced hammer to seat the keys, if necessary.
    Fig 5: Compressing Valve Spring Using J 8062

    Courtesy of GENERAL MOTORS CORP.
11. 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.

12. Install the remaining valves, springs, and other components.
    Fig 6: Measuring Valve Spring Installed

    Courtesy of GENERAL MOTORS CORP.
13. Install sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent, to the threads of the coolant sensor.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
14. Install the coolant sensor into the left cylinder head.

    Tighten 

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

    Fig 7: Coolant Sensor (Left Cylinder Head)

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

    Tighten 

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

    Fig 8: Coolant Plug (Right Cylinder Head)

    Courtesy of GENERAL MOTORS CORP.
16. Apply threadlock GM P/N United States 12345382, GM P/N Canada 10953489, or equivalent, to the sides of the cylinder head expansion plugs (1), if applicable.
17. 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 9: Expansion Plugs

    Courtesy of GENERAL MOTORS CORP.