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Home >> Chevrolet >> 2007 >> Optra LT, Automatic >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.0L (L34 GMDAT) >> Repair Instructions >> Cylinder Head Assemble >> Assembly Procedure

Assembly Procedure

    CAUTION: Refer to Safety Glasses Caution .
    Fig 1: View Of Oil Coated Valve Stem And Seat
    GM1241260Courtesy of GENERAL MOTORS CORP.
  1. Coat the valve stems with engine oil.
  2. Insert the valves in the cylinder head in their original positions.
  3. Insert the valve spring seats.
    4. CAUTION: Refer to Compressed Valve Spring Caution .
  4. Push the accompanying assembly sleeve onto the valve stem.
  5. Insert the new valve stem seat.
  6. Carefully drive the valve stem seal onto the stop with light taps.
  7. Install the valve springs in their original positions.
  8. Install the valve springs caps.
    9. Fig 2: Compressing Valve Springs
    GM1252182Courtesy of GENERAL MOTORS CORP.
  9. Compress the valve springs with the J 8062  (1) and KM-653-A  (2).
  10. Install the valve retainers.
  11. Remove the J 8062  (1) and KM-653-A  (2).
    12. Fig 3: View Of Valve Lash Adjusters
    GM1252180Courtesy of GENERAL MOTORS CORP.
  12. Lubricate the valve lash adjusters with engine oil.
  13. Install the valve lash adjusters.
    14. Fig 4: View Of Camshaft Bearing Caps And Bolts
    GM1252134Courtesy of GENERAL MOTORS CORP.
  14. Install the intake camshaft.
  15. Install the intake camshaft bearing caps in their original positions.
  16. Install the exhaust camshaft.
  17. Install the exhaust camshaft bearing caps in their original positions.
  18. Install the camshaft bearing cap bolts.
    19. NOTE: Refer to Fastener Notice .
  19. Tighten the camshaft bearing cap bolts gradually and in the sequence shown for each camshaft cap.

    Tighten:  Tighten the camshaft bearing cap bolts to 8 N.m (71 lb in)  .

    20. Fig 5: View Of Ignition Coil, EGR Mounting Bracket And Bolts
    GM1241257Courtesy of GENERAL MOTORS CORP.
  20. Install the spark plugs.

    Tighten:  Tighten the spark plugs to 20 N.m (15 lb ft)  .

  21. Install the ignition coil and exhaust gas recirculation (EGR) mounting bracket and bolt.

    Tighten:  Tighten the ignition coil and EGR mounting bracket bolts to 25 N.m (18 lb ft)  .

  22. Install the ignition coil and EGR.

    Tighten:  Tighten the ignition coil and EGR to 25 N.m (18 lb ft)  .

    23. Fig 6: View Of Intake Manifold Retaining Nut Installation Sequence
    GM1252158Courtesy of GENERAL MOTORS CORP.
  23. Install the intake manifold studs.
  24. Install the intake manifold gasket.
  25. Install the intake manifold.
  26. Install the intake manifold retaining nuts and retaining bolts in the sequence shown.

    Tighten:  Tighten the intake manifold retaining nuts and retaining bolts to 22 N.m (16 lb ft)  .

    27. Fig 7: View Of Thermostat Housing And Bolts
    GM1241256Courtesy of GENERAL MOTORS CORP.
  27. Install the fuel rail assembly. Refer to Fuel Rail Assembly Replacement .
  28. Install the thermostat housing assembly.
  29. Install the thermostat housing mounting bolts.

    Tighten:  Tighten the thermostat housing mounting bolts to 15 N.m (11 lb ft)  .

  30. Install the coolant bypass housing bolts.

    Tighten:  Tighten the coolant bypass housing bolts to 15 N.m (11 lb ft)  .

    31. Fig 8: View Of Exhaust Manifold Retaining Nut Installation Sequence
    GM1252166Courtesy of GENERAL MOTORS CORP.
  31. Install the exhaust manifold studs.
  32. Install the exhaust manifold gasket.
  33. Install the exhaust manifold.
  34. Install the exhaust manifold retaining nuts in the sequence shown.

    Tighten:  Tighten the exhaust manifold retaining nuts to 22 N.m (16 lb ft)  .

  35. Install the exhaust manifold heat shield.
  36. Install the exhaust manifold heat shield bolts.

    Tighten:  Tighten the exhaust manifold heat shield bolts to 8 N.m (71 lb in)  .

  37. Install the cylinder head with the intake manifold and the exhaust manifold attached. Refer to Cylinder Head Replacement .
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