Toyota Sienna 2000-06

Valve Covers

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Removal & Installation



3.0L Engine
  1. Remove or disconnect the following:

    Wiper and blade assembly
     
    Top cowl seal and panel
     
    Window washer hoses from the ventilator louvers
     
    Left and right ventilator louvers
     
    Heater air duct
     

  2.  
  3. Relieve the fuel pressure.
    NOTE
    Wait at least 90 seconds from the time the negative battery was disconnected to start work.



    Turn the ignition key to the OFF position
     
    Negative battery cable
     

  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Accelerator and throttle cables, if equipped with an automatic transaxle
     
    Air cleaner cover, air flow meter and the air duct
     
    Cruise control actuator and bracket, if equipped
     
    2 engine ground straps
     
    Right engine mounting support
     
    Radiator hoses
     
    2 heater hoses
     
    Fuel feed and return lines from the fuel rail assembly
     
    Pressure hose from the hydraulic motor
     
    V-bank cover
     

  8.  
  9. Disconnect the following vacuum hoses:

    Fuel pressure control Vacuum Switching Valve (VSV)
     
    Fuel pressure regulator
     
    Cylinder head rear plate
     
    Intake air control valve VSV
     
    Exhaust Gas Recirculation (EGR) vacuum modulator
     
    EGR valve
     

  10.  
  11. Disconnect the following wiring and hoses:

    Intake air control valve
     
    Fuel pressure regulator
     
    EGR VSV
     

  12.  
  13. Remove the 2 nuts and the emission control valve set.
  14.  
  15. Disconnect the following hoses;

    Brake booster vacuum hose
     
    PCV hose
     
    Intake air control valve vacuum hose
     

  16.  
  17. Remove or disconnect the following:

    Data Link Connector (DLC) from the mounting bracket
     
    2 ground straps from the intake chamber
     
    Hydraulic motor pressure hose from the intake chamber
     
    Right Oxygen (O 2 ) sensor connector from the power steering pressure tube
     
    2 nuts and the power steering pressure tube from the intake chamber
     
    Both power steering air hoses
     
    Engine hanger and the intake chamber support
     
    EGR pipe and gaskets
     

  18.  
  19. Disconnect the following wiring:

    Throttle Position (TP) sensor connector
     
    Idle Air Control (IAC) valve connector
     
    EGR gas temperature connector
     
    Air conditioning idle up connector
     

  20.  
  21. Disconnect the following vacuum hoses:

    2 vacuum hoses from the Thermal Vacuum Valve (TVV)
     
    Vacuum hose from the cylinder head rear plate
     
    Vacuum hose from the charcoal canister
     

  22.  
  23. Remove or disconnect the following:

    Air assist hose and the 2 water bypass hoses
     
    Air intake chamber
     
    Left engine wiring harness and move it aside
     
    Wiring harness from the rear of the engine
     
    Right engine wiring harness and move it aside
     
    Ignition coils and move them aside
     
    Timing belt
     
    Camshaft pulleys and the timing belt rear cover
     
    Cylinder head rear plate
     
    Water inlet pipe
     
    Air assist hose and vacuum hose
     
    Intake manifold and fuel rail assembly
     
    Water outlet
     
    EGR pipe from the right exhaust manifold
     
    Front exhaust pipe and exhaust manifolds
     
    Dipstick assembly and the power steering pump bracket
     
    Valve covers
     

  24.  

To install:

Click image to see an enlarged view

Fig. Apply seal packing to the cylinder heads at the areas illustrated-Sienna with 3.0L engine

  1. Clean the valve cover mating surfaces.
  2.  
  3. Apply seal packing to the cylinder heads at the areas illustrated.

    Cylinder head covers, using new gaskets and tighten the retainers to 69 inch lbs. (8 Nm)
     
    Dipstick and power steering pump bracket
     
    Exhaust manifolds. Tighten the nuts to 36 ft. lbs. (49 Nm).
     
    EGR pipe to the right exhaust manifold
     
    Water outlet
     
    Intake manifold and the fuel rail assembly. Tighten the intake manifold nuts/bolts to 11 ft. lbs. (15 Nm).
     
    Air assist hose and the 2 water bypass hoses
     
    Water inlet pipe and cylinder head rear plate
     
    Timing belt rear cover and camshaft pulleys
     
    Timing belt
     
    Spark plugs and ignition coils
     
    Right engine wiring harness
     
    Wiring harness to the rear of the engine
     
    Left engine wiring harness
     
    Air intake chamber
     
    EGR pipe, using new gaskets
     

  4.  
  5. Connect the following vacuum hoses:

    The 2 TVV vacuum hoses
     
    The vacuum hose to the rear cylinder head plate
     
    Charcoal canister vacuum hose
     

  6.  
  7. Connect the following electrical wiring:

    TP sensor connector
     
    IAC valve connector
     
    EGR gas temperature connector
     
    Air conditioning idle up connector
     

  8.  
  9. Install or connect the following:

    Engine hanger and the intake chamber support
     
    Both power steering air hoses
     
    Power steering pressure tube to the intake chamber
     
    O 2 sensor connector to the pressure tube.
     
    Both ground straps, to the intake chamber
     
    DLC to the bracket
     

  10.  
  11. Connect the following hoses:

    Power brake booster vacuum hose
     
    PCV hose
     
    IAC valve vacuum hose
     

  12.  
  13. Install or connect the following:

    Emission control valve set and related vacuum hoses and connectors
     
    V-bank cover
     
    Pressure hose to the hydraulic motor
     
    Fuel lines to the fuel rail assembly
     
    Heater and radiator hoses
     
    Right engine mounting support
     
    both engine ground straps
     
    Upper front suspension brace, if removed. Tighten the nuts to 59 ft. lbs. (80 Nm).
     
    Cruise control actuator and bracket
     
    Air cleaner, air flow meter and air duct assembly
     
    Accelerator and throttle cables, if equipped with an automatic transaxle
     

  14.  
  15. Fill the cooling system.
  16.  
  17. Install or connect the following:

    Negative battery cable
     
    Heater air duct
     
    Left and right ventilator louvers
     
    Window washer hoses from the ventilator louvers
     
    Top cowl seal and panel
     
    Wiper and blade assembly
     

  18.  
  19. Start the engine and check for leaks.
  20.  
  21. Bleed the air from the cooling system.
  22.  
  23. Road test the vehicle and check for unusual noise, shock, slippage, correct shift points and smooth operation.
  24.  
  25. Recheck the coolant and engine oil levels.
  26.  

3.3L Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Drain the engine oil.
  8.  
  9. Drain and recycle the engine coolant.
  10.  
  11. Remove the right hand front wheel.
  12.  
  13. Remove the wiper arms.
  14.  
  15. Remove the cowl panel.
  16.  
  17. Remove the wiper link assembly.
  18.  
  19. Remove the cowl top to inner brace.
  20.  
  21. Remove the cowl top cover outer sub assembly.
  22.  
  23. Remove the engine cover.
  24.  
  25. Remove the air cleaner assembly.
  26.  
  27. Remove the air surge tank.
  28.  
  29. Disconnect the fuel pipe sub assembly.
  30.  
  31. Disconnect the heater hose inlet pipe.
  32.  
  33. Remove the intake manifold.
  34.  
  35. Disconnect the radiator inlet hose.
  36.  
  37. Disconnect the water outlet as follows:
    1. Disconnect the engine coolant temperature sensor.
    2.  
    3. Remove the clamp, bolts nuts and washers.
    4.  
    5. Lock the clamp open and remove the water outlet with the by pass hose and remove the gaskets.
    6.  

  38.  
  39. Remove the right hand front fender apron seal.
  40.  
  41. Remove the compressor to crankshaft pulley belt.
  42.  
  43. Remove the vane pump belt.
  44.  
  45. Remove the engine moving control rod.
  46.  
  47. Remove the number 2 engine mounting stay as follows:
    1. Remove the bolt and wire harness bracket.
    2.  
    3. Remove the bolt, stay and bracket.
    4.  

  48.  
  49. Remove the number 2 alternator bracket and the alternator belt adjusting bar.
  50.  
  51. Remove the crankshaft pulley.
  52.  
  53. Remove the timing belt covers 1 and 2. Refer to the timing belt removal and installation procedure in this manual.
  54.  
  55. Remove the right hand engine mount bracket.
  56.  
  57. Remove the timing belt guide and timing belt. Refer to the timing belt removal and installation procedure in this manual.
  58.  
  59. Remove the timing belt guide number 2. Refer to the timing belt removal and installation procedure in this manual.
  60.  
  61. Remove the camshaft pulley and lower timing cover. Refer to the timing belt removal and installation procedure in this manual.
  62.  
  63. Remove the vane pump.
  64.  
  65. Remove the propeller shaft on 4 wheel drive models.
  66.  
  67. Remove the front exhaust pipe on 2 wheel drive models, or center exhaust pipe on 4 wheel drive models.
  68.  
  69. Remove the number 1 exhaust manifold heat insulator.
  70.  
  71. Remove the manifold stay.
  72.  
  73. Disconnect the oxygen sensor and remove the right hand exhaust manifold.
  74.  
  75. Disconnect the front exhaust pipe assembly.
  76.  
  77. Remove the number 3 manifold converter and number e exhaust manifold hear insulator.
  78.  
  79. Disconnect the oxygen sensor and remove the left hand exhaust manifold.
  80.  
  81. Remove the dipstick tube.
  82.  
  83. Remove the ignition coil.
  84.  
  85. Remove the cylinder head covers.
  86.  

To install:

  1. Apply sealant to the cylinder heads where the camshaft supports meet the cylinder heads. Install the cylinder head covers, using new gaskets.
  2.  
  3. Install the remaining components in the reverse order of removal.
  4.  
  5. Fill the engine with correct grade and amount of oil.
  6.  
  7. Fill the cooling system.
  8.  
  9. Start the engine and check for leaks.
  10.  
  11. Bleed the air from the cooling system.
  12.  
  13. Road test the vehicle and check for unusual noise, shock, slippage, correct shift points and smooth operation.
  14.  
  15. Recheck the coolant and engine oil levels.
  16.  

 
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