Cylinder Head Assemble

Special Tools

• EN-8062:  Valve Spring Compressor
• EN-9666:  Valve Spring Tester
• EN-43963:  Valve Spring Compressor (off car)

For equivalent regional tools, refer to Special Tools .

Fig 1: View of Cylinder Head Plugs and Oil Restrictor
Courtesy of GENERAL MOTORS CORP.
CAUTION: In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.
1. Install NEW cylinder head plugs (1). Coat the plugs with sealer GM P/N 12345382 (Canadian P/N 10953489) or equivalent.
2. Inspect the valve springs for the following conditions:
   • Expanded height
   • Unparallel spring ends
   • Spring tension using EN-9666:  tester
   • Any distorted springs should be replaced
Fig 2: Applying Prussian Blue To Valves
Courtesy of GENERAL MOTORS CORP.
3. Assemble the valves (1).
4. Use the following steps to measure valve runout:
   1. Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are an indication of concentricity of the valve seat.
   2. Clean all traces of Prussian blue.
   3. Apply a dab of Prussian blue on the valve seat and repeat the check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.
Fig 3: View of Valves
Courtesy of GENERAL MOTORS CORP.
5. Replace the valves (1), if required.
Fig 4: View of Valve Seals
Courtesy of GENERAL MOTORS CORP.
6. Install the new valve seals (1). Fully seat the seals on the valve guides.
Fig 5: View of Valve Springs
Courtesy of GENERAL MOTORS CORP.
7. Install the springs (1).
Fig 6: View of Valve Keys and Retainer
Courtesy of GENERAL MOTORS CORP.
8. Install the retainer (1).
9. Using the EN-8062:  compressor and the EN-43963:  compressor (off car), compress the valve spring.
10. Install the valve keys.
11. Slowly release the EN-8062:  compressor and the EN-43963:  compressor (off car) from the valve/spring assembly.
12. Inspect for proper valve key seating.
13. Install the remaining valves, springs, and other components.
Fig 7: Identifying Coolant Air Bleed Hose Fitting
Courtesy of GENERAL MOTORS CORP.
CAUTION: Refer to Fastener Caution .
14. Install the cylinder head air bleed tube (1) and tighten the tube to 15 N.m (11 lb ft).