Scion 2005-06

Cylinder Head

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Removal & Installation



1.5L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Drain the engine oil.
  6.  
  7. Relieve the fuel system pressure.
  8.  
  9. Remove or disconnect the following:

    Negative battery cable
     
    Air intake assembly
     
    Engine appearance cover
     
    Right-hand front wheel
     
    Engine undercover
     
    Accelerator control cable
     
    Fuel tube from the fuel supply hose
     
    Brake booster check valve hose
     
    Radiator hose
     
    Heater hoses
     
    Radiator filler hose
     
    Front exhaust pipe
     
    Exhaust manifold
     
    Intake manifold
     
    Oil dipstick guide
     
    Ignition coil
     
    Accessory drive belts
     
    Alternator
     
    Camshaft timing oil control valve
     
    Ventilation hoses from the cylinder head cover
     
    Cylinder head cover
     
    Water pump
     
    Front cover
     
    Crankshaft pulley
     
    Crankshaft position sensor
     

  10.  
  11. Support the engine with a suitable jack.
  12.  
  13. Remove or disconnect the following:

    Right-hand engine mount
     
    Timing chain
     
    Fuel supply hose
     
    Fuel rail and injectors
     
    Camshaft and sprockets
     

  14.  
  15. Loosen the cylinder head mounting bolts, in several steps, in the sequence shown.

    Click image to see an enlarged view

    Fig. Cylinder head bolt removal sequence-1.5L engine

  16.  
  17. Remove the cylinder head and gasket.
  18.  

To install:

  1. Install the cylinder head with a new gasket. The Lot Number on the gasket should face upward.
  2.  
  3. Apply a light coat of new engine oil to the threads of the cylinder head bolts. Tighten the bolts in the sequence shown as follows:
    1. Step 1: Tighten to 22 ft. lbs. (29 Nm).
    2.  
    3. Step 2: Plus 90 degrees.
    4.  
    5. Step 3: Plus an additional 90 degrees.

      Click image to see an enlarged view

      Fig. Cylinder head torque sequence-1.5L engine

    6.  

  4.  
  5. Install or connect the following:

    Camshaft and sprockets
     
    Fuel rail and injectors
     
    Fuel supply hose
     
    Timing chain
     
    Right-hand engine mount
     
    Camshaft timing oil control valve
     
    Crankshaft position sensor
     
    Front cover
     
    Water pump
     
    Cylinder head cover
     
    Alternator
     
    Accessory drive belts
     
    Ventilation hoses to the cylinder head cover
     
    Ignition coil. Tighten bolts to 80 inch lbs. (9 Nm).
     
    Oil dipstick guide
     
    Intake manifold
     
    Exhaust manifold
     
    Front exhaust pipe. Tighten to 32 ft. lbs. (43 Nm).
     
    Radiator filler hose. Tighten support bracket to 66 inch lbs. (7.5 Nm).
     
    Heater hose
     
    Radiator hose
     
    Brake booster check valve hose
     
    Fuel tube to the fuel supply hose
     
    Accelerator control cable
     
    Engine undercover
     
    Front wheel
     
    Engine appearance cover
     
    Air intake assembly
     
    Negative battery cable
     

  6.  
  7. Refill the engine with oil to the correct level.
  8.  
  9. Refill the cooling system to the correct level.
  10.  
  11. Start the engine and check for leaks.
  12.  

 
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