Acura CL Integra NSX RL RSX TL TSX 2001-2006

Valve Lash

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Adjustment



2004-06 TL & 2005-06 RL Models


Click image to see an enlarged view

Fig. Valve adjusting screw locations- 2004- 06 TL and 2005- 06 RL models


NOTE
Adjust the valves only when the cylinder head temperature is less than 100 ºF (38 ºC).

  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove the right side engine compartment cover.
  4.  
  5. Remove the cylinder head covers.
  6.  
  7. Set the No. 1 piston at Top Dead Center (TDC).
  8.  
  9. Align the pointer on the front upper cover with the No. 1 piston TDC mark on the front camshaft pulley.

    Click image to see an enlarged view

    Fig. Align the pointer on the front upper cover with the No. 1 piston TDC mark on the front camshaft pulley- 2004- 06 TL and 2005- 06 RL models

  10.  
  11. Select the correct thickness feeler gauge for the valves you're going to check.
  12.  
  13. Valve clearance on the intake valves is 0.008- 0.009 inch (0.20- 0.24 mm) and on the exhaust side it is 0.011- 0.013 inch (0.28- 0.32 mm).
  14.  
  15. Insert the feeler gauge between the adjusting screw and the end of the valve stem on No. 1 cylinder and slide it back and forth; you should feel a slight amount of drag.
  16.  
  17. If you feel too much or too little drag, loosen the locknut, and turn the adjusting screw until the drag on the feeler gauge is correct.
  18.  
  19. Tighten the locknut to 14 ft. lbs. (20 Nm) and recheck the clearance.
  20.  
  21. Repeat the adjustment, if necessary.
  22.  
  23. Rotate the crankshaft clockwise. Align the pointer on the front upper cover with the No. 4 piston TDC mark on the front camshaft pulley.

    Click image to see an enlarged view

    Fig. Align the pointer on the front upper cover with the No. 4 piston TDC mark on the front camshaft pulley- 2004- 06 TL and 2005- 06 RL models

  24.  
  25. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
  26.  
  27. Rotate the crankshaft clockwise. Align the pointer on the front upper cover with the No. 2 piston TDC mark on the front camshaft pulley.

    Click image to see an enlarged view

    Fig. Align the pointer on the front upper cover with the No. 2 piston TDC mark on the front camshaft pulley- 2004- 06 TL and 2005- 06 RL models

  28.  
  29. Check and, if necessary, adjust the valve clearance on No. 2 cylinder
  30.  
  31. Rotate the crankshaft clockwise. Align the pointer on the front upper cover with the No. 5 piston TDC mark on the front camshaft pulley.

    Click image to see an enlarged view

    Fig. Align the pointer on the front upper cover with the No. 5 piston TDC mark on the front camshaft pulley- 2004- 06 TL and 2005- 06 RL models

  32.  
  33. Check and, if necessary, adjust the valve clearance on No. 5 cylinder
  34.  
  35. Rotate the crankshaft clockwise. Align the pointer on the front upper cover with the No. 3 piston TDC mark on the front camshaft pulley.

    Click image to see an enlarged view

    Fig. Align the pointer on the front upper cover with the No. 3 piston TDC mark on the front camshaft pulley- 2004- 06 TL and 2005- 06 RL models

  36.  
  37. Rotate the crankshaft clockwise. Align the pointer on the front upper cover with the No. 6 piston TDC mark on the front camshaft pulley.

    Click image to see an enlarged view

    Fig. Align the pointer on the front upper cover with the No. 6 piston TDC mark on the front camshaft pulley- 2004- 06 TL and 2005- 06 RL models

  38.  
  39. Check and, if necessary, adjust the valve clearance on No. 6 cylinder.
  40.  
  41. Install the cylinder head covers.
  42.  
  43. Install the right side engine compartment cover.
  44.  

CL, 2001-04 RL & 2001-03 TL Models

These engines are equipped with hydraulic valve lash adjusters on the rocker arms. No valve clearance adjustments are possible or necessary.

Integra & RSX Models

NOTE
While all valve adjustments must be as accurate as possible, it is better to have the valve adjustment slightly loose rather than too tight. Burned valves may result from overly tight adjustments. Perform the valve adjustment for each cylinder in the same sequence as the firing order: 1-3-4-2.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Be sure the engine is cold; cylinder head temperature must be below 100° F (38° C). Overnight cold is best.
  4.  
  5. Remove the cylinder head cover.
  6.  
  7. Remove the upper timing belt cover, 1.8L engines only
  8.  
  9. Set the No. 1 cylinder to Top Dead Center (TDC).
    1. On 1.8L engines, the word UP should appear at the top and the TDC grooves on the pulley should align with the cylinder head surface or the mark on the rear belt cover.
    2.  
    3. On 2.0L engines, the punch mark (arrow) on the Variable Valve Timing Control (VTC) actuator and the punch mark on the exhaust camshaft sprockets should be at the top. Align the TDC marks on the VTC actuator and exhaust camshaft sprocket.

      Click image to see an enlarged view

      Fig. The punch mark (A) on the VTC actuator and the punch mark (B) on the exhaust camshaft sprockets should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust camshaft sprocket.

    4.  

  10.  
  11. For 1.8L engines, valve clearances are:

    B18B1 engine: Intake-0.003-0.005 in. (0.08-0.12mm) Exhaust-0.006-0.008 in. (0.16-0.20mm)
     
    B18C1 and B18C5 VTEC engine: Intake-0.006-0.007 in. (0.15-0.19mm) Exhaust-0.007-0.008 in. (0.17-0.20mm)

    Click image to see an enlarged view

    Fig. Valve arrangement-1.8L (B18B1, B18C1, and B18C5) engines

     

  12.  
  13. For 2.0L engines, valve clearances are:

    K20A3 engine: Intake-0.008-0.010 in. (0.21-0.25mm) Exhaust-0.011-0.013 in. (0.28-0.32mm)
     
    K20A2 engine: Intake-0.008-0.010 in. (0.21-0.25mm) Exhaust-0.010-0.011 in. (0.25-0.29mm)

    Click image to see an enlarged view

    Fig. Valve arrangement-2.0L engines

     

  14.  
  15. With the No. 1 cylinder at TDC, adjust the valves of the No. 1 cylinder by performing the following procedures:
    1. Hold the rocker arm against the valve and place the feeler gauge between the rocker arm and the camshaft lobe. There should be a slight drag on the feeler gauge.
    2.  
    3. If adjustment is required, loosen the valve adjusting the screw locknut.
    4.  
    5. Turn the adjusting screw to obtain the proper clearance.
    6.  
    7. Hold the adjusting screw and tighten the locknut(s). For 1.8L engines tighten to 18 ft. lbs. (25 Nm). For the 2.0L tighten the locknut to 14 ft. lbs. (20 Nm) for all except K20A3 exhaust locknuts. For the K20A3 exhaust, tighten the locknut to 10 ft. lbs. (14 Nm).
    8.  
    9. Recheck the clearance.
    10.  

  16.  
  17. Turn the crankshaft 180 degrees counterclockwise; the cam pulley will turn 90 degrees. With the No. 3 cylinder at TDC, the UP marks should be at the exhaust side. Adjust the valves on the No. 3 cylinder.
  18.  
  19. Turn the crankshaft 180 degrees counterclockwise; the cam pulley will turn 90 degrees. With the No. 4 cylinder at TDC, both UP marks should be at the bottom. Adjust the valves on the No. 4 cylinder.
  20.  
  21. Turn the crankshaft 180 degrees counterclockwise. The No. 2 cylinder will now be on TDC and the UP marks should be at the intake side. Adjust the valves on the No. 2 cylinder.
  22.  
  23. Install the cylinder head cover and upper timing belt cover.
  24.  

NSX Models
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Cylinder head cover
     
    Upper front timing belt cover
     

  4.  
  5. Rotate the crankshaft so the No. 1 piston is at Top Dead Center (TDC) on compression to adjust the valves for the No. 1 cylinder.

    Click image to see an enlarged view

    Fig. Adjusting screw locations for valve lash adjustment- 3.0L engine



    Click image to see an enlarged view

    Fig. Slide the feeler gauge between the valve and rocker arm while turning the adjusting screw- 3.0L engine

  6.  
  7. Loosen the locknuts and adjust the screws until a slight drag can be felt with the feeler gage when the gage is placed between the valve and rocker arm tip as shown. The specifications are as follows:

    Intake: 0.006- 0.007 in. (0.15- 0.18mm)
     
    Exhaust: 0.007- 0.008 in. (0.18- 0.20mm)
     

  8.  
  9. Rotate the crankshaft clockwise until the No. 4 on the camshaft sprocket is near the pointer on the rear cover. This is the No. 4 cylinder firing position.

    Click image to see an enlarged view

    Fig. Camshaft sprocket position when No. 1 piston is at TDC- 3.0L engine

  10.  
  11. Adjust the valves for the No. 4 cylinder while the sprocket is in this position. Tighten the locknuts to 14 ft. lbs. (20 Nm).
  12.  
  13. Continue to rotate the crankshaft and adjust the valves for cylinders 3 and 2.
  14.  
  15. Install the timing belt and cylinder head covers.
  16.  

TSX Models

NOTE
The valve clearance should be adjusted when the engine is cold, the cylinder head temperature should be less than 100° F (38° C).


NOTE
The radio may contain a coded theft protection circuit. Always obtain the code number before disconnecting the battery.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Label the wires before disconnecting them.



    Negative battery cable
     



    Spark plug wires from the spark plugs
     
    Positive Crankcase Ventilation (PCV) hose
     
    Cylinder head cover. Replace the rubber seals if damaged or deteriorated.
     

  4.  
  5. Turn the engine to align the timing marks and set cylinder No.1 to TDC. The white mark on the crankshaft pulley should align with the pointer on the timing belt cover. The words UP embossed on the camshaft pulley should be aligned in the upward position. The marks on the edge of the pulley should be aligned with the cylinder head or the back cover upper edge.

    Click image to see an enlarged view

    Fig. The punch mark (A) on the VTC actuator and the punch mark (B) on the exhaust cam sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust cam sprockets- 2.4L engine

  6.  
  7. Adjust the valves on cylinder No. 1 by performing the following:
    1. Insert a feeler gauge in between the camshaft lobe and the rocker arm.
      NOTE
      The intake valve clearance specification is 0.008- 0.010 in. (0.21- 0.25mm). The exhaust valve clearance specification is 0.010- 0.011 in. (0.25- 0.29mm).

    2.  
    3. Loosen the locknut and turn the adjusting screw until the feeler gauge slides back and forth with a slight amount of drag.
    4.  
    5. Tighten the locknut to 14 ft. lbs. (20 Nm) and recheck the valve clearance. Repeat the valve adjustment if necessary.
    6.  

  8.  
  9. Rotate the crankshaft 180° counterclockwise (the camshaft pulleys will turn 90° ) The UP arrow marks should be pointing to the exhaust side of the cylinder head.
  10.  
  11. Adjust the valves on cylinder No. 3 by performing the following:
    1. Insert a feeler gauge in between the camshaft lobe and the rocker arm.
    2.  
    3. Loosen the locknut and turn the adjusting screw until the feeler gauge slides back and forth with a slight amount of drag.
    4.  
    5. Tighten the locknut to 14 ft. lbs. (20 Nm) and recheck the valve clearance. Repeat the valve adjustment if necessary.
    6.  

  12.  
  13. Rotate the crankshaft 180° counterclockwise (the camshaft pulleys will turn 90° ) to bring No. 4 piston to TDC. The UP arrow marks should be pointing down, toward the crankshaft.
  14.  
  15. Adjust the valves on cylinder No. 4 by performing the following:
    1. Insert a feeler gauge in between the camshaft lobe and the rocker arm.
    2.  
    3. Loosen the locknut and turn the adjusting screw until the feeler gauge slides back and forth with a slight amount of drag.
    4.  
    5. Tighten the locknut to 14 ft. lbs. (20 Nm) and recheck the valve clearance. Repeat the valve adjustment if necessary.
    6.  

  16.  
  17. Rotate the crankshaft 180° counterclockwise (the camshaft pulleys will turn 90° ) to bring piston No. 2 to TDC. The UP arrow marks should be pointing to the intake side of the cylinder head.
  18.  
  19. Adjust the valves on cylinder No. 2 by performing the following:
    1. Insert a feeler gauge in between the camshaft lobe and the rocker arm.
    2.  
    3. Loosen the locknut and turn the adjusting screw until the feeler gauge slides back and forth with a slight amount of drag.
    4.  
    5. Tighten the locknut to 14 ft. lbs. (20 Nm) and recheck the valve clearance. Repeat the valve adjustment if necessary.
    6.  

  20.  
  21. Install the cylinder head cover gasket cover to the groove of the cylinder head cover. Before installing the gasket, thoroughly clean the seal and the groove. Seat the recesses for the camshaft first, then work it into the groove around the outside edges. Be sure the gasket is seated securely in the corners of the recesses.
  22.  
  23. Apply liquid gasket to the 4 corners of the recesses of the cylinder head cover gasket. Do not install the parts if 5 minutes or more have elapsed since applying liquid gasket. After assembly, wait at least 20 minutes before filling the engine with oil.
  24.  
  25. Install or connect the following:

    Cylinder head (valve) cover. Tighten the bolts attaching to 84 inch lbs. (10 Nm).
     
    Spark plug wires to the correct spark plugs.
     
    Positive, then the negative battery cable and enter the radio security code.

    Click image to see an enlarged view

    Fig. Valve clearance adjusting screw locations

     

  26.  

 
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