Cylinder Head Disassemble

Special Tools 

J 8062  Valve Spring Compressor - Head Off

For equivalent regional tools, refer to Special Tools .

Fig 1: Compressing Valve Spring Using
Courtesy of GENERAL MOTORS COMPANY
NOTE:
• With the components at room temperature, remove the spark plugs from the cylinder head.
• Mark, organize, or sort the cylinder head components for assembly. Return the components to their original location during assembly.
1. Remove the spark plugs from the cylinder heads.
2. Use the J 8062  valve spring compressor in order to compress the valve spring.
Fig 2: Valve Stem Keys, Valve Spring Cap & Valve Spring
Courtesy of GENERAL MOTORS COMPANY
3. Remove the valve stem keys (225).
4. Remove the valve spring cap (224).
5. Remove the valve spring (223).
6. Remove the valves (228).
7. Remove the valve stem oil seal (222). Refer to Separating Parts .
Fig 3: Locating Cylinder Head Core Hole Plug
Courtesy of GENERAL MOTORS COMPANY
8. Remove the cylinder head core hole plugs (216), as required.
Fig 4: Locating Coolant Temperature Sensor
Courtesy of GENERAL MOTORS COMPANY
9. Remove the coolant temperature sensor (725) from the left cylinder head.
Fig 5: Locating Coolant Plug
Courtesy of GENERAL MOTORS COMPANY
10. Remove the cylinder head plug (229) from the right cylinder head.
Fig 6: Rivet-Type Plug
Courtesy of GENERAL MOTORS COMPANY
11. Inspect for a leaking 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.
Fig 7: View Of Plug Assembly
Courtesy of GENERAL MOTORS COMPANY
12. Using a 6.43 mm (0.25 in) or smaller punch, remove the plug assembly (1) from the cylinder head.
Fig 8: Engine Coolant Air Bleed Cover, Bolts & Seals
Courtesy of GENERAL MOTORS COMPANY
13. If plug removal is required, install either a new plug or a first design coolant air bleed cover (313), seal (308), and bolt (312) to complete the repair. Refer to Cylinder Head Assemble