Montana, Silhouette, Venture 2000-2005

Valve Covers

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Removal & Installation



3.5L Engine
Left Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the cooling system below the thermostat housing.
  4.  
  5. Remove the front ignition wiring harness at the upper intake manifold and spark plugs.
  6.  
  7. Remove the thermostat bypass pipe.
  8.  
  9. Disconnect the positive crankcase ventilation (PCV) hose.
  10.  
  11. Remove the valve cover mounting bolts and valve cover.
    NOTE
    Gently bump the end of the cover with the palm of your hand or soft rubber mallet if the cover is stuck.

  12.  
  13. Remove the valve cover gasket.
  14.  

To install:

  1. Trim the sealant away from the lower intake manifold gasket at the cylinder head to the lower intake manifold joints.
  2.  
  3. Clean the sealing surfaces of the cylinder head and valve cover with degreaser.

    Click image to see an enlarged view

    Fig. Apply sealant at the cylinder head to the lower intake manifold joints-3.5L engine

  4.  
  5. Apply sealant at the cylinder head to the lower intake manifold joints.
  6.  
  7. Install a new gasket to the valve cover. Ensure that the gasket is properly seated in the groove of the valve rocker arm cover.
  8.  
  9. Install the valve rocker cover. Tighten the mounting bolts to 89 inch lbs. (10 Nm).
  10.  
  11. The remainder of the removal is the reverse order of removal.
  12.  
  13. Refill the cooling system to the correct level.
  14.  

Right Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the accessory drive belt.
  6.  
  7. Remove the alternator and alternator mounting bracket.
  8.  
  9. Remove the right side spark plug wires.
  10.  
  11. Disconnect the vacuum hoses from the evaporative emission (EVAP) purge valve.
  12.  
  13. Remove the EVAP purge valve.
  14.  
  15. Remove the ignition coil bracket with the coils.
  16.  
  17. Remove the vacuum hose from the grommet in the right side valve cover.
  18.  
  19. Remove the valve cover mounting bolts and valve cover.
    NOTE
    Gently bump the end of the cover with the palm of your hand or soft rubber mallet if the cover is stuck.

  20.  
  21. Remove the valve cover gasket.
  22.  

To install:

  1. Trim the sealant away from the lower intake manifold gasket at the cylinder head to the lower intake manifold joints.
  2.  
  3. Clean the sealing surfaces of the cylinder head and valve cover with degreaser.
  4.  
  5. Apply sealant at the cylinder head to the lower intake manifold joints.
  6.  
  7. Install a new gasket to the valve cover. Ensure that the gasket is properly seated in the groove of the valve rocker arm cover.
  8.  
  9. Install the valve rocker cover. Tighten the mounting bolts to 89 inch lbs. (10 Nm).
  10.  
  11. The remainder of the removal is the reverse order of removal.
  12.  

3.9L Engine
Left Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the Positive Crankcase Ventilation (PCV) tube. Replace both O-rings when re-installing.
  4.  
  5. Remove the valve cover bolts.
  6.  
  7. Remove valve cover and gasket.
  8.  
  9. Installation is the reverse order of removal.
  10.  

Right Side
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove any spark plug wires from their retainers for clearance.
  4.  
  5. Remove the ignition coil assembly.
  6.  
  7. Remove the ignition coil assembly studs if necessary.
  8.  
  9. Remove the fresh air tube from the valve cover.
  10.  
  11. Remove the valve cover mounting bolts.
  12.  
  13. Remove the valve cover.
  14.  
  15. Installation is the reverse order of removal.
  16.  

Left Side
  1. Remove the right engine strut mount..
  2.  
  3. Remove the thermostat bypass pipe.
  4.  
  5. Remove the PCV valve from valve rocker arm cover.
    NOTE
    Valve rocker arm cover gasket and sealant must be carefully trimmed away from lower intake manifold gasket. Failure to do so will damage the lower intake manifold gasket, causing a severe oil leak.

  6.  
  7. Remove the valve rocker arm cover bolts.
    NOTE
    When removing the valve rocker arm cover, make sure the gasket stays in place attached to the cylinder head.

  8.  
  9. Remove the valve rocker arm cover. Bump the end of the valve rocker arm cover with the palm of your hand or a soft rubber mallet if the cover adheres to the cylinder head.
  10.  
  11. Trim valve cover gasket and sealant away from lower intake manifold gasket at the cylinder head to lower intake manifold joints.
  12.  
  13. Remove the valve cover gasket.
  14.  
  15. Clean the sealing surface on the cylinder head with degreaser.
  16.  
  17. Clean the valve rocker arm cover.

    Click image to see an enlarged view

    Fig. The removal and installation of the left rocker arm cover

  18.  

To install:


NOTE
All gasket mating surfaces need to be free of oil and foreign material. Use GM P/N 12346139 (Canadian P/N 88901148), or equivalent, at the cylinder head to lower intake manifold joint.


NOTE
Apply sealant GM P/N 12378521 (Canadian P/N 88901148), or equivalent, at the cylinder head lower intake joint.

  1. Apply sealant at the cylinder head to lower intake manifold joints.
  2.  
  3. Install the valve rocker arm cover gasket into valve rocker arm cover. Ensure that the gasket is properly seated in the groove of the valve rocker arm cover.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4.  
  5. Install the valve rocker arm cover and tighten the bolts to 89 inch lbs. (10 Nm).
  6.  
  7. Install the PCV valve to valve rocker arm cover.
  8.  
  9. Install the thermostat bypass pipe.
  10.  
  11. Install the right engine mount strut.
  12.  

Right Side
  1. Remove the drive belt.
  2.  
  3. Remove the generator.
  4.  
  5. Remove the generator bracket.
  6.  
  7. Disconnect the engine right side spark plug wires.
  8.  
  9. Disconnect the vacuum hoses from the Evaporative emissions (EVAP) canister purge solenoid valve.
  10.  
  11. Remove the EVAP canister purge solenoid valve.
  12.  
  13. Remove the ignition module bracket with the coils.

    Click image to see an enlarged view

    Fig. Remove the ignition module bracket with the coils.

  14.  
  15. Remove the vacuum hose from the grommet in the engine right side valve rocker arm cover.
    NOTE
    Valve rocker arm cover gasket and sealant must be carefully trimmed away from lower intake manifold gasket. Failure to do so will damage the lower intake manifold gasket, causing a severe oil leak.

  16.  
  17. Remove the valve rocker arm cover bolts.
    NOTE
    When removing the valve rocker arm cover, make sure the gasket stays in place attached to the cylinder head.

  18.  
  19. Remove the valve rocker. Bump the end of the valve rocker arm cover with the palm of your hand or a soft rubber mallet if the cover adheres to the cylinder head.
  20.  
  21. Trim the valve cover gasket and sealant away from lower intake manifold gasket at the cylinder head to lower intake manifold joints.
  22.  
  23. Remove the valve cover gasket.
  24.  
  25. Clean the sealing surface on the cylinder head with degreaser.
  26.  
  27. Clean the valve rocker arm cover.
  28.  

To install:


NOTE
All gasket mating surfaces need to be free of oil and foreign material. Use GM P/N 12346139 (Canadian P/N 10953463) or equivalent to clean surfaces. Important: Apply sealant GM P/N 12378521 (Canadian P/N 88901148), or equivalent, at the cylinder head to lower intake manifold joint.

  1. Apply sealant at the cylinder head to lower intake manifold joint. Install the valve rocker arm cover gasket into the valve rocker arm cover. Ensure that the gasket is properly seated in the groove of the valve rocker arm cover.
  2.  
  3. Install valve rocker arm cover.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4.  
  5. Install the valve rocker arm cover bolts and tighten the bolts to 89 inch lbs. (10 Nm).
  6.  
  7. Install the vacuum hose to the grommet in the engine right side valve rocker arm cover.
  8.  
  9. Install the ignition module bracket with the coils.
  10.  
  11. Install the EVAP canister purge solenoid valve.
  12.  
  13. Connect the vacuum hoses from the EVAP canister purge solenoid valve.
  14.  
  15. Connect the engine right side spark plug wires.
  16.  
  17. Install the generator bracket.
  18.  
  19. Install the generator.
  20.  
  21. Install the drive belt..
  22.  

 
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