For 1990-2009 cars

#### Special Tools

J 8062 Valve Spring Compressor - Head Off

For equivalent regional tools, refer to Special Tools

1. Clean the cylinder head valve spring shim area.

Note: When using the valves and related components again, install the parts to their original location.

2. Install the valves (228) into the proper port. Refer to Separating Parts
3. Install the valve stem oil seal (222).
4. Install the valve spring (223).
5. Install the valve spring cap (224).
6. Using the J 8062 compressor , compress the valve spring.
7. Install the valve stem keys.

7.1. | Use grease in order to hold the keys in place and remove the J 8062 compressor .

7.2. | Ensure the keys seat properly in the groove of the valve stem.

7.3. | Tap the end of the valve stem with a plastic face hammer to seat the keys, if necessary.

8. Using a ruler, measure the valve spring installed height.

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.

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

9. Install the remaining valves, springs, and other components.
10. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the coolant temperature sensor (725).

Caution: Refer to Fastener Caution in the Preface section.

11. Install the coolant temperature sensor into the left cylinder head and tighten to 20 N·m (15 lb ft).
12. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the cylinder head plug (229).
13. Install the cylinder head plug to the right cylinder head and tighten to 20 N·m (15 lb ft).
14. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the sides of the cylinder head plugs (216).
15. Install the cylinder head 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.

16. Second design applications use a rivet-type plug (1) at the top rear coolant passage of each cylinder head. If service of a leaking plug is required, it is necessary to remove the cylinder head from the engine to properly remove the plug.
17. If plug removal is required, install a first design coolant air bleed cover and bolt to complete the repair.