Cylinder Head Assemble (LDK, LHU)

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 (LDK, LHU) .

Fig 1: Cylinder Head Plugs
Courtesy of GENERAL MOTORS COMPANY
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. Refer to Adhesives, Fluids, Lubricants, and Sealers .
2. Inspect the valve springs.
3. Look for the following conditions when inspecting the valve springs:
   • Expanded height
   • Unparallel spring ends
   • Spring tension using EN-9666  tester
   • Any distorted springs should be replaced
Fig 2: View of Valve Runout
Courtesy of GENERAL MOTORS COMPANY
4. Inspect the valves (1) and the valve seats. Refer to Valve and Seat Grinding .
Fig 3: Keeping Engine Valves In Order
Courtesy of GENERAL MOTORS COMPANY
5. Install the valves (1). Replace any valves, if required.
Fig 4: Valve Seals
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Always use NEW valve stem oil seals when assembling the cylinder head.

6. Install the new valve seals (1). Fully seat the seals on the valve guides.
Fig 5: Valve Springs
Courtesy of GENERAL MOTORS COMPANY
7. Install the springs (1).
Fig 6: Valve Train Components
Courtesy of GENERAL MOTORS COMPANY
WARNING:

Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.

CAUTION:

Do not compress the valve springs to less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

8. Install the retainer (2).
9. Using the EN-8062  compressor and the EN-43963  compressor, compress the valve spring.
10. Install the valve keys (1).
11. Slowly release the EN-8062  compressor and the EN-43963  compressor from the valve/spring assembly.
12. Inspect for proper valve key seating.
13. Install the remaining valves, springs, and other components.
Fig 7: Intake Camshaft Position Sensor
Courtesy of GENERAL MOTORS COMPANY
14. Lubricate the camshaft position sensor O-ring with clean engine oil.
CAUTION:

Refer to Fastener Caution .

15. Install the intake camshaft position sensor (1) and bolt. Tighten the intake camshaft position sensor bolt to 10 N.m (89 lb in).