Toyota Celica, Corolla, ECHO & MR2 1999-05

Valve Lash (Clearance) Adjustment

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Fig. Adjusting shim chart (intake and exhaust)- 5S-FE and 1MZ-FE engines



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Fig. Adjusting shim chart (intake)-1ZZ-FE engine



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Fig. Adjusting shim chart (exhaust)-1ZZ-FE engine



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Fig. Adjusting shim chart (intake)-2ZZ-GE engine



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Fig. Adjusting shim chart (exhaust)-2ZZ-GE engine



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Fig. Adjusting shim chart (exhaust)-1NZ-FE engine



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Fig. Adjusting shim chart (intake)-1NZ-FE engine



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Fig. Common method of removing valve shims



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Fig. Adjusting shim chart (intake and exhaust)-5E-FE engine



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Fig. Adjusting shim chart (intake and exhaust)- 5S-FE, 1MZ-FE, 2JZ-GE and 2JZ-GTE engines



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Fig. Adjusting shim chart (intake)-1ZZ-FE engine



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Fig. Adjusting shim chart (exhaust)-1ZZ-FE engine



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Fig. Adjusting shim chart (intake)-2ZZ-GE engine



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Fig. Adjusting shim chart (exhaust)-2ZZ-GE engine



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Fig. Adjusting shim chart (exhaust)-1NZ-FE engine



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Fig. Adjusting shim chart (intake)-1NZ-FE engine



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Fig. Common method of removing valve shims



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Fig. Adjusting shim chart (intake)-1ZZ-FE engine



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Fig. Adjusting shim chart (exhaust)-1ZZ-FE engine



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Fig. Adjusting shim chart (intake)-2ZZ-FE engine



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Fig. Adjusting shim chart (exhaust)-2ZZ-FE engine



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Fig. Adjusting shim chart (exhaust)-1NZ-FE engine



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Fig. Adjusting shim chart (intake)-1NZ-FE engine



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Fig. Common method of removing valve shims

1NZ-FE Engines




NOTE
Adjust the valve clearance when the engine is cold.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable. On vehicles equipped with an air bag, wait at least 90 seconds before proceeding.
     
    Cylinder head cover
     

  4.  
  5. Turn the crankshaft pulley and align its groove with the timing mark 0 of the No. 1 timing cover.
  6.  
  7. Check that the timing marks on the camshaft sprockets and valve timing controller are facing up (12 o-clock). If not, turn the crankshaft 1 complete revolution (360 degrees).
  8.  
  9. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves No. 1 and 2. Measure the exhaust valves at No. 1 and 3.
    1. The intake valve clearance cold is 0.006-0.010 in. (0.15-0.25mm).
    2.  
    3. The exhaust valve clearance cold is 0.010-0.014 in. (0.25-0.35mm).

      Click image to see an enlarged view

      Fig. Intake valves (1 and 2) and exhaust valves (1 and 3)-1NZ-FE engine

    4.  

  10.  
  11. Turn the crankshaft pulley 1 revolution (360 degrees) and align the timing mark as before.
  12.  
  13. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves No. 3 and 4. Measure the exhaust valves at No. 2 and 4.
    1. The intake valve clearance cold is 0.006-0.010 in. (0.15-0.25mm).
    2.  
    3. The exhaust valve clearance cold is 0.010-0.014 in. (0.25-0.35mm).
    4.  

  14.  
  15. To adjust the valve clearance:
    1. Set the No.1 cylinder at TDC compression. Place matchmarks on the timing chain and sprockets.
    2.  
    3. Remove the 2 plugs from the timing chain cover.
    4.  
    5. Turn the exhaust camshaft clockwise slightly while rotating the stopper plate on the tensioner downward. Push in on the tension plunger. When the stopper plate cannot be easily lowered, rotate the exhaust camshaft clockwise and counterclockwise slightly. Insert a 3mm bar into the holes in the stopper plate and tensioner to lock the tensioner. Remove the timing chain.
    6.  
    7. Remove the valve timing controller assembly.
    8.  
    9. Remove the lifters.
    10.  

  16.  
  17. Determine the replacement adjusting shim size by either using the chart or the following formula:

    Intake: N = T + A - 0.008 in. (0.20mm)
     
    Exhaust: N = T + A - 0.012 in. (0.30mm)
     
    T = Thickness of removed shim
     
    A = Measured valve clearance
     
    N = Thickness of new shim
     

  18.  
  19. Install a new shim.
  20.  
  21. Recheck the valve clearance.
  22.  
  23. Install the cylinder head covers.
  24.  
  25. Connect the negative battery cable.
  26.  

2ZZ-GE Engine




NOTE
Adjust the valve clearance when the engine is cold.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable.
     
    Cylinder head covers
     

  4.  
  5. Turn the crankshaft pulley and align its groove with the timing mark 0 of the No. 1 timing cover.
  6.  
  7. Check that the timing marks on the camshaft sprockets are in alignment with the upper edge of the timing cover. If not, turn the crankshaft 1 complete revolution (360 degrees).
  8.  
  9. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves No. 1 and 2. Measure the exhaust valves at No. 1 and 3.
    1. The intake valve clearance cold is 0.006-0.010 in. (0.15-0.25mm).
    2.  
    3. The exhaust valve clearance cold is 0.014-0.018 in. (0.36-0.45mm).
    4.  

  10.  
  11. Turn the crankshaft pulley 1 revolution (360 degrees) and align the groove with the timing mark 0 of the No.1 timing belt cover.
  12.  
  13. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves No. 3 and 4. Measure the exhaust valves at No. 2 and 4.
    1. The intake valve clearance cold is 0.006-0.010 in. (0.15-0.25mm).
    2.  
    3. The exhaust valve clearance cold is 0.014-0.018 in. (0.36-0.45mm).
    4.  

  14.  
  15. To adjust the intake valve clearance:
    1. Remove the intake camshaft.
    2.  
    3. Using a small screwdriver and a magnetic finger, remove the adjusting shim.
    4.  
    5. Determine the replacement adjusting shim size by either using the chart or the following formula:

      Intake: N = T + A - 0.008 in. (0.20mm)
       
      T = Thickness of removed shim
       
      A = Measured valve clearance
       
      N = Thickness of new shim
       

    6.  
    7. Install a new shim.
    8.  
    9. Install intake camshaft.
    10.  
    11. Recheck the valve clearance.
    12.  

  16.  
  17. To adjust the exhaust valve clearance:
    1. Turn the crankshaft to position the cam lobe of the camshaft on the valve to be adjusted, upward.
    2.  
    3. Turn the valve lifter so that the notch is perpendicular to the camshaft and facing the spark plug side.
    4.  
    5. Using SST 09248-55040 (valve lifter press), or equivalent, hold the camshaft in place.
    6.  
    7. Using SST 09248-55040 (valve lifter press), or equivalent, press down the valve lifter and place SST 09248-05420 (valve lifter stopper), or equivalent between the camshaft and valve lifter.
    8.  
    9. Remove the SST 09248-44040 tool.
    10.  
    11. Using a small screwdriver and a magnetic finger, remove the adjusting shim.
    12.  

  18.  
  19. Determine the replacement adjusting shim size by either using the chart or the following formula:

    Exhaust: N = T + A - 0.014 in. (0.36mm)
     
    T = Thickness of removed shim
     
    A = Measured valve clearance
     
    N = Thickness of new shim
     

  20.  
  21. Install a new shim.
  22.  
  23. Recheck the valve clearance.
  24.  
  25. Install or connect the following:

    Cylinder head covers
     
    Negative battery cable
     

  26.  

5S-FE Engines




NOTE
Adjust the valve clearance when the engine is cold.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable. On vehicles equipped with an air bag, wait at least 90 seconds before proceeding.
     
    Cylinder head covers
     

  4.  
  5. Turn the crankshaft pulley and align its groove with the timing mark 0 of the No. 1 timing cover.
  6.  
  7. Check that the timing marks on the camshaft sprockets are in alignment with the marks on the No. 4 timing cover. If not, turn the crankshaft 1 complete revolution (360 degrees).
  8.  
  9. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves No. 1 and 2. Measure the exhaust valves at No. 1 and 3.
    1. The intake valve clearance cold is 0.007-0.011 in. (0.19-0.29mm).
    2.  
    3. The exhaust valve clearance cold is 0.011-0.015 in. (0.28-0.38mm).

      Click image to see an enlarged view

      Fig. Intake valves (1 and 2) and exhaust valves (1 and 3)-2.2L (5S-FE) engine

    4.  

  10.  
  11. Turn the crankshaft pulley 1 revolution (360 degrees) and align the groove with the timing mark 0 of the No.1 timing belt cover.
  12.  
  13. Measure the clearance between the valve lifter and the camshaft. Record the measurements on the intake valves No. 3 and 4. Measure the exhaust valves at 2 and 4.
    1. The intake valve clearance cold is 0.007-0.011 in. (0.19-0.29mm).
    2.  
    3. The exhaust valve clearance cold is 0.011-0.015 in. (0.29-0.38mm).

      Click image to see an enlarged view

      Fig. Intake valves (3 and 4) and exhaust valves (2 and 4)-2.2L (5S-FE) engine

    4.  

  14.  
  15. To adjust the valve clearance:
    1. Turn the crankshaft to position the cam lobe of the camshaft on the valve to be adjusted, upward.
    2.  
    3. Turn the valve lifter so that the notch is perpendicular to the camshaft and facing the spark plug side.
    4.  
    5. Using SST 09248-55040 (valve lifter press), or equivalent, hold the camshaft in place.
    6.  
    7. Using SST 09248-55040 (valve lifter press), or equivalent, press down the valve lifter and place SST 09248-05420 (valve lifter stopper), or equivalent between the camshaft and valve lifter.
    8.  
    9. Remove the SST 09248-44040 tool.
    10.  
    11. Using a small screwdriver and a magnetic finger, remove the adjusting shim.
    12.  

  16.  
  17. Determine the replacement adjusting shim size by either using the chart or the following formula:

    Intake: N = T + A - 0.009 in. (24mm)
     
    Exhaust: N = T + A - 0.013 in. (0.33mm)
     
    T = Thickness of removed shim
     
    A = Measured valve clearance
     
    N = Thickness of new shim
     

  18.  
  19. Install a new shim.
  20.  
  21. Recheck the valve clearance.
  22.  
  23. Install or connect the following:

    Cylinder head covers
     
    Negative battery cable
     

  24.  

7A-FE Engine



Inspect and adjust the valve clearance while the engine is cold.

  1. Remove the spark plug wires from the valve cover.
  2.  
  3. Remove the valve cover and gasket as described in Section 3.
  4.  
  5. Set the No. 1 cylinder to TDC by turning the crankshaft pulley and align its groove with the timing mark "0" of the No. 1 timing cover. Check that the hole of the camshaft timing pulley is aligned with the timing mark of the bearing cap. If not, turn the crankshaft one revolution (360°).
  6.  
  7. To inspect the valve clearance, check only the valves indicated.
    1. Using a thickness gage, measure the clearance between the valve lifter and camshaft. Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.

      Intake COLD: 0.006-0.010 inch (0.15-0.25mm)
       
      Exhaust COLD: 0.010-0.014 inch (0.25-0.35mm)
       

    2.  
    3. Turn the crankshaft pulley one revolution (360°) and align its groove with the timing mark "0" of the No. 1 timing cover. Check only the valve indicated in the illustration. Measure the valve clearance as specified earlier.
    4.  

  8.  
  9. On the intake side to adjust the valve clearance the camshaft must be removed.
  10.  
  11. Remove the adjusting shim with a small flat bladed tool.
  12.  
  13. Determine the replacement adjusting shim size by following the formula or charts.
    1. Using a micrometer, measure the thickness of the removed shim. Calculate the thickness of a new shim so that the valve clearance comes within the specified value.

      T: Thickness of the remove shim
       
      A: Measured value of clearance
       
      N: Thickness of the new shim
       
      Intake: N= T + (A - 0.008 inch (0.20mm))
       

    2.  
    3. Select a new shim with a thickness as close as possible to calculate value. The shims are available in 16 sizes in increments of 0.0020 inch (0.05mm). They range from 1.0039 inch (2.55mm) to 0.1299 inch (3.30mm).
    4.  

  14.  
  15. Install the new adjusting shim by placing the shim on the valve lifter.
  16.  
  17. Install the intake camshaft.
  18.  
  19. Recheck the valve clearance.
  20.  
  21. To adjust the exhaust valve clearance, turn the crankshaft so that the cam lobe of the camshaft on the adjusting valve is upward.Apply SST-B at a slight angle on the side marked with "9", at the position shown in the illustration. When SST-B is inserted too deeply, it will get pinched by the shim. To prevent it from getting stuck, insert it gently from the intake side at a slight angle. The shape of the cam makes it difficult to insert SST-B from the intake side to the No. 3 rear. For this shim, it is best approached from the exhaust side instead.
    1. Position the notch of the valve lifter facing the front of the vehicle.
    2.  
    3. Using a SST-A (09248-05410) or equivalent valve clearance and adjuster tool, press down the valve lifter and place SST-B 09248-05420 (or equivalent), between the camshaft and valve lifter. Remove the SST-A.
    4.  

  22.  
  23. Remove the adjusting shim with a small flat bladed tool and magnetic finger.
  24.  
  25. Determine the replacement shim size by following the formula or the chart.
    1. Using a micrometer, measure the thickness of the removed shim. Calculate the thickness of a new shim so that the valve clearance comes within the specified value.

      T: Thickness of the remove shim
       
      A: Measured value of clearance
       
      N: Thickness of the new shim
       
      Exhaust: N= T + (A - 0.012 inch (0.30mm))
       

    2.  
    3. Select a new shim with a thickness as close as possible to calculate value. The shims are available in 16 sizes in increments of 0.0020 inch (0.05mm). They range from 1.0039 inch (2.55mm) to 0.1299 inch (3.30mm).
    4.  

  26.  
  27. Install the new adjusting shim on the valve lifter. Using the SST-A or equivalent, press down the valve lifter and remove SST-B.
  28.  
  29. Recheck the valve clearance.
  30.  
  31. Install and secure the valve cover. Attach the spark plug wires.
  32.  



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Fig. Adjusting shim chart-7A-FE intake



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Fig. Adjusting shim chart-7A-FE exhaust

General Information



Check and adjust the valve clearance every 60,000 miles or 72 months.

Valve clearance is one factor which determines how far the intake and exhaust valves will open into the cylinder. If the valve clearance is too large, part of the lift of the camshaft will be used up in removing the excessive clearance, thus the valves will not be opened far enough. This condition has two effects, the valve train components will emit a tapping noise as they take up the excessive clearance, and the engine will perform poorly, since the less the intake valve opens, the smaller the amount of air/fuel mixture that will be admitted to the cylinders. The less the exhaust valves open, the greater the back-pressure in the cylinder which prevents the proper air/fuel mixture from entering the cylinder.

If the valve clearance is too small, the intake and exhaust valves will not fully seat on the cylinder head when they close. When a valve seats on the cylinder head it does two things, it seals the combustion chamber so none of the gases in the cylinder can escape and it cools itself by transferring some of the heat it absorbed from the combustion process through the cylinder head and into the engine cooling system. Therefore, if the valve clearance is too small, the engine will run poorly due to gases escaping from the combustion chamber, and the valves will overheat and warp since they cannot transfer heat unless they are touching the seat in the cylinder head.

 
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