Tools Required

J 8062  Valve Spring Compressor - Head Off. See Special Tools .

Fig 1: View Of Cylinder Head Components
Courtesy of GENERAL MOTORS CORP.
1. Clean the cylinder head valve spring shim area.
IMPORTANT: When using the valves and related components again, install the parts to their original location.
2. Install the valves (227 and 228) into the proper port. 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 (222).
4. Install the valve spring (223).
5. Install the valve spring cap (224).
Fig 2: Compressing Valve Spring Using
Courtesy of GENERAL MOTORS CORP.
6. Compress the valve spring using the J 8062  . See Special Tools .
7. Install the valve stem keys.
   1. Use grease to hold the keys in place and remove the J 8062  . See Special Tools .
   2. Ensure the keys seat properly in the groove of the valve stem.
   3. Tap the end to the valve stem with a plastic faced hammer to seat the keys, if necessary.
Fig 3: Measuring Valve Spring Installed Height
Courtesy of GENERAL MOTORS CORP.
8. Measure the valve spring installed height using a ruler.

   Measure from the base of the valve spring to the top of the valve spring.

   Specification: 

   • If the installed height exceeds 46.25 mm (1.82 in), install a valve spring shim of approximately 0.5 mm (0.02 in) thick.
   • Do not shim the valve spring to obtain less than the specified height.

9. Install the remaining valves, springs, and other components.
Fig 4: View Of Coolant Temperature Sensor (Left Cylinder Head)
Courtesy of GENERAL MOTORS CORP.
10. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the coolant temperature sensor.
NOTE: Refer to Fastener Notice .
11. Install the coolant temperature sensor into the left cylinder head.

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

Fig 5: View Of Coolant Plug (Right Cylinder Head)
Courtesy of GENERAL MOTORS CORP.
12. Install sealant GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the plug.
13. Install the coolant plug to the right cylinder head.

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

Fig 6: View Of Cylinder Head Expansion Plugs
Courtesy of GENERAL MOTORS CORP.
14. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the sides of the cylinder head core hole plugs (226).
15. Install the core hole plugs into the cylinder head.

    A properly installed plug should be installed 2.5 mm (0.1 in) below the end face of the head.