Scion 2005-06

Valve Lash (Clearance) Adjustment

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1.5L Engine



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Inspect the valve clearance when the engine is cold.



    Negative battery cable
     
    Engine appearance cover
     
    Ignition coil
     
    Ventilation hoses from the cylinder head cover
     
    Cylinder head cover
     

  4.  
  5. Turn the crankshaft pulley to set the No. 1 cylinder at TDC.
  6.  
  7. Using a feeler gauge, measure the valve clearance shown in the illustration. Record the measurements.
  8.  
  9. Turn the crankshaft 1 complete revolution until the timing mark 0 of the chain cover are aligned to set the No. 4 cylinder at TDC.
  10.  
  11. Using a feeler gauge, measure the valve clearance shown in the illustration. Record the measurements.
    1. Intake valve clearance is 0.006-0.010 inches (0.15-0.25 mm).
    2.  
    3. Exhaust valve clearance is 0.010-0.014 inches (0.25-0.35 mm).

      Click image to see an enlarged view

      Fig. Measure indicated valve lifters with No. 1 cylinder at TDC-1.5L Engine



      Click image to see an enlarged view

      Fig. Measure indicated valve lifters with No. 4 cylinder at TDC-1.5L Engine

    4.  

  12.  
  13. To adjust the valve clearance:
    1. Set the No. 1 cylinder at TDC compression. Matchmark the timing chain and cam shaft sprockets.
    2.  
    3. Remove the screw plug and insert a screwdriver into the service hole of the chain tensioner to hold the stopper plate of the chain tensioner at an upward position.
    4.  
    5. Using a wrench, rotate the exhaust camshaft clockwise to push in the plunger of the chain tensioner.
    6.  
    7. Remove the screwdriver from the service hole, and then align the hole of the stopper plate with the service hole and insert a 0.08-0.12 in. (2 -3 mm) diameter bar into the holes to hold the stopper plate.
    8.  
    9. Using Special Tool 09023-38400, hold the camshaft with a wrench on the hexagonal lobe, and remove the flange bolt.
    10.  
    11. Remove the exhaust camshaft bearing caps.
      NOTE
      Loosen each bolt uniformly, keeping the camshaft level.

    12.  
    13. Remove the flange bolt with the exhaust camshaft lifted up. Then detach the exhaust camshaft and the camshaft timing sprocket.
    14.  
    15. Remove the intake camshaft bearing caps.
      NOTE
      Loosen each bolt uniformly, keeping the camshaft level.

    16.  
    17. Hold the timing chain by hand, and remove the camshaft and the camshaft timing gear assembly.
    18.  
    19. Remove the valve lifters.
    20.  
    21. Using a micrometer, measure the thickness of the removed lifter.
    22.  

  14.  
  15. Calculate the thickness of a new lifter so that the valve clearance comes within the specified value.

    Intake: New lifter thickness = Used lifter thickness + Recorded valve clearance measurement - 0.008 in. (0.20 mm)
     
    Exhaust: New lifter thickness = Used lifter thickness + Recorded valve clearance measurement - 0.012 in. (0.30 mm)
     

  16.  
  17. Select a new lifter with the thickness as close to the calculated value as possible.
  18.  
  19. Reinstall the camshafts and check the valve clearance.
  20.  
  21. Install the cylinder head cover and remaining components.
  22.  
  23. Start the engine and check for leaks.
  24.  

2.4L Engine



  1. Support the engine with a suitable jack.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Right-hand front wheel
     
    Engine undercover
     
    Engine appearance cover
     
    Accessory drive belt
     
    Power steering pump
     
    Right-hand engine mount
     
    Ignition coil
     
    Cylinder head cover
     

  4.  
  5. Turn the crankshaft to set the No. 1 cylinder at TDC compression.
    NOTE
    Inspect the valve clearance when the engine is cold.

  6.  
  7. Turn the crankshaft pulley to set the No. 1 cylinder at TDC.
  8.  
  9. Using a feeler gauge, measure the valve clearance shown in the illustration. Record the measurements.
  10.  
  11. Turn the crankshaft 1 complete revolution and set the No. 4 cylinder to TDC.
  12.  
  13. Using a feeler gauge, measure the valve clearance shown in the illustration. Record the measurements.
    1. Intake valve clearance is 0.0075-0.0114 inches (0.19-0.29 mm).
    2.  
    3. Exhaust valve clearance is 0.0118-0.0158 inches (0.30-0.40 mm).

      Click image to see an enlarged view

      Fig. Measure indicated valve lifters with No. 1 cylinder at TDC-2.4L Engine



      Click image to see an enlarged view

      Fig. Measure indicated valve lifters with No. 4 cylinder at TDC-2.4L Engine

    4.  

  14.  
  15. To adjust the valve clearance:
  16.  
  17. Remove the camshafts.
  18.  
  19. Remove the valve lifters.
    1. Using a micrometer, measure the thickness of the removed lifter.
    2.  

  20.  
  21. Calculate the thickness of a new lifter so that the valve clearance comes within the specified value.

    Intake: New lifter thickness = Used lifter thickness + Recorded valve clearance measurement - 0.0095 in. (0.24 mm)
     
    Exhaust: New lifter thickness = Used lifter thickness + Recorded valve clearance measurement - 0.0138 in. (0.35 mm)
     

  22.  
  23. Select a new lifter with the thickness as close to the calculated value as possible.
  24.  
  25. Reinstall the camshafts and check the valve clearance.
  26.  
  27. Install the cylinder head cover and remaining components.
  28.  
  29. Start the engine and check for leaks.
  30.  

 
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