Acura CL Integra NSX RL RSX TL TSX 2001-2006

Rocker Arms/Shafts

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Removal & Installation



1.8L (B18b1) Engine
1.8L (B18c1, B18c5) Engine And NSX
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following: Negative battery cableCylinder head from the vehicle

    Negative battery cable
     
    Cylinder head from the vehicle
     

  4.  
  5. Hold each rocker arm assembly together with a rubber band to prevent them from separating.
  6.  
  7. Remove or disconnect the following: Intake and exhaust rocker shaft orifices from the cylinder head-The rocker shaft orifices are different and should be identified when removed. Discard the O-rings on the orifices.VTEC solenoid from the cylinder head and discard the filter

    Intake and exhaust rocker shaft orifices from the cylinder head-The rocker shaft orifices are different and should be identified when removed. Discard the O-rings on the orifices.
     
    VTEC solenoid from the cylinder head and discard the filter
     

  8.  
  9. Insert 12mm bolts into the rocker arm shafts.
  10.  
  11. Remove each rocker arm set while slowly pulling out the rocker arm shaft.
  12.  


NOTE
Tag each rocker arm set to assure installation in their original locations.

  1. Inspect the rocker arm pistons. If they do not move smoothly, replace the rocker arm assembly.
  2.  
  3. Remove the lost motion assembly from the cylinder head. Inspect the lost motion assembly by pushing the plunger with your finger. Replace the lost motion assembly if it does not move smoothly.
  4.  

To install:

  1. Install the lost motion assembly to the cylinder head.
  2.  
  3. Apply engine oil to the rocker arm pistons, then bundle the rocker arms with a rubber band. Apply a light coat of clean engine oil to the rocker arms.
  4.  
  5. Position the rocker arms in their original locations, if they are being reused. If new assembles are being used place them in the cylinder head.
  6.  
  7. Lightly coat the rocker arm shafts with clean engine oil, then install the rocker arm shafts into the cylinder head. A 12mm bolt can be installed into the end of the rocker arm shafts to aid in their installation. Be sure to install the shafts in the proper positions. Remove the 12mm bolts from the rocker arm shafts.
  8.  
  9. Clean and install the rocker arm shaft orifices with new O-rings. If the holes in the rocker arm shafts are not aligned screw a 12mm bolt into the end of the shaft to position the it.
  10.  
  11. Install the sealing bolts with new washers and tighten them to 47 ft. lbs. (64 Nm).
  12.  
  13. Install the cylinder head into the vehicle.
  14.  

2.0L Engine
2.4L Engines
3.0L, 3.2L And 3.5L Engines (Except NSX)
2001-03 TL Models
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the cylinder head from the vehicle.
  6.  
  7. Loosen the rocker shaft holder bolts 1 turn at a time in the opposite of the installation sequence. Following this procedure will prevent the camshafts and rocker assemblies from warping.
  8.  
  9. After all bolts are loose, remove the rocker arm shafts as an assembly with the bolts still in the holders.
  10.  
  11. If the rocker shafts are to be disassembled, note that each rocker arm has a letter A or B stamped into the side. Before disassembling the rocker arms, make a note of the position of each letter so the arms can be reassembled the same way.
  12.  
  13. Do not remove the hydraulic tappets from the rocker arms unless they are to be replaced. Handle the rocker arms carefully so the oil does not drain out of the tappets.
  14.  
  15. Lift the camshafts from the cylinder head, wipe them clean and inspect the lift ramps. Replace the camshafts and rockers if the lobes are pitted, scored, or excessively worn.
  16.  

To install:

  1. Lubricate the camshaft and its journals with fresh engine oil.
  2.  
  3. Place a new camshaft seal on the end of the camshaft. The spring side of the seal must face in. Lubricate the journals and set the camshaft in place on the head.
  4.  
  5. Install the camshaft onto the cylinder head with the keyway pointed up.
  6.  
  7. Apply liquid gasket to the mounting surfaces of the camshaft end holders.
  8.  
  9. Set the rocker arm assemblies in place and start all the cam holder bolts. Be sure the rocker arms are properly positioned and turn each bolt in sequence 2 turns at a time until the holders are seated on the head. Follow this procedure to avoid damaging the camshaft and rocker assemblies.
  10.  
  11. When all the camshaft and rocker holders are seated, tighten the bolts in the same sequence. Tighten the 8mm bolts to 16 ft. lbs. (22 Nm) and the 6mm bolts to 104 inch lbs. (12 Nm).
  12.  
  13. Install or connect the following:

    Cylinder head
     
    Negative battery cable
     

  14.  
  15. Check for proper engine and valve train operation.

    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-2001-03 3.2L engine

  16.  

2001-04 RL Models
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the cylinder head from the vehicle.
  6.  
  7. Loosen the rocker shaft holder bolts 1 turn at a time in the opposite of the installation sequence. Following this procedure will prevent the camshafts and rocker assemblies from warping.
  8.  
  9. After all bolts are loose, remove the rocker arm shafts as an assembly with the bolts still in the holders.
  10.  
  11. If the rocker shafts are to be disassembled, note that each rocker arm has a letter A or B stamped into the side. Before disassembling the rocker arms, make a note of the position of each letter so the arms can be reassembled the same way.
  12.  
  13. Do not remove the hydraulic tappets from the rocker arms unless they are to be replaced. Handle the rocker arms carefully so the oil does not drain out of the tappets.
  14.  
  15. Lift the camshafts from the cylinder head, wipe them clean and inspect the lift ramps. Replace the camshafts and rockers if the lobes are pitted, scored, or excessively worn.
  16.  

To install:

  1. Lubricate the camshaft and its journals with fresh engine oil.
  2.  
  3. Place a new camshaft seal on the end of the camshaft. The spring side of the seal must face in. Lubricate the journals and set the camshaft in place on the head.
  4.  
  5. Install the camshaft onto the cylinder head with the keyway pointed up.
  6.  
  7. Apply liquid gasket to the mounting surfaces of the camshaft end holders.
  8.  
  9. Set the rocker arm assemblies in place and start all the cam holder bolts. Be sure the rocker arms are properly positioned and turn each bolt in sequence 2 turns at a time until the holders are seated on the head. Follow this procedure to avoid damaging the camshaft and rocker assemblies.
  10.  
  11. When all the camshaft and rocker holders are seated, tighten the bolts in the same sequence. Tighten the 8mm bolts to 16 ft. lbs. (22 Nm) and the 6mm bolts to 104 inch lbs. (12 Nm).
  12.  
  13. Install or connect the following:

    Cylinder head
     
    Negative battery cable
     

  14.  
  15. Check for proper engine and valve train operation.

    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-2001-04 3.5L engine

  16.  

2004-06 TL & 2005-06 RL Models
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove the cylinder head cover.
  4.  
  5. Loosen the adjusting screws (A).

    Click image to see an enlarged view

    Fig. Loosen the rocker arm adjusting screws-2004-06 TL and 2005-06 RL models

  6.  
  7. Remove the bolts and the rocker arm assembly as follows:
    1. Step 1: Unscrew the rocker shaft mounting bolts two turns at a time, in a crisscross pattern, to prevent damaging the valves or rocker arm assembly.
    2.  
    3. Step 2: When removing the rocker arm assembly, do not remove the rocker shaft mounting bolts. The bolts will keep the springs and the rocker arms on the shafts

      Click image to see an enlarged view

      Fig. Loosen the rocker arm mounting bolts-2004-06 TL and 2005-06 RL models

    4.  

  8.  

To install:

  1. Set the rocker arm assembly in place, and loosely install the bolts. Make sure that the rocker arms are properly positioned on the valve stems.
  2.  
  3. Tighten each bolt two turns at a time in the sequence shown to ensure that the rockers do not bind on the valves. Tighten to a final torque of 17 ft. lbs. (24 Nm).
    NOTE
    Apply new engine oil to the threads and flange of the exhaust rocker shaft mounting bolts.

  4.  
  5. Install the cylinder head cover.

    Click image to see an enlarged view

    Fig. Tighten the rocker arm mounting bolts-2004-06 TL and 2005-06 RL models

  6.  

CL Models
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the cylinder head from the vehicle.
  6.  
  7. Loosen the rocker shaft holder bolts 1 turn at a time in the opposite of the installation sequence. Following this procedure will prevent the camshafts and rocker assemblies from warping.
  8.  
  9. After all bolts are loose, remove the rocker arm shafts as an assembly with the bolts still in the holders.
  10.  
  11. If the rocker shafts are to be disassembled, note that each rocker arm has a letter A or B stamped into the side. Before disassembling the rocker arms, make a note of the position of each letter so the arms can be reassembled the same way.
  12.  
  13. Do not remove the hydraulic tappets from the rocker arms unless they are to be replaced. Handle the rocker arms carefully so the oil does not drain out of the tappets.
  14.  
  15. Lift the camshafts from the cylinder head, wipe them clean and inspect the lift ramps. Replace the camshafts and rockers if the lobes are pitted, scored, or excessively worn.
  16.  

To install:

  1. Lubricate the camshaft and its journals with fresh engine oil.
  2.  
  3. Place a new camshaft seal on the end of the camshaft. The spring side of the seal must face in. Lubricate the journals and set the camshaft in place on the head.
  4.  
  5. Install the camshaft onto the cylinder head with the keyway pointed up.
  6.  
  7. Apply liquid gasket to the mounting surfaces of the camshaft end holders.
  8.  
  9. Set the rocker arm assemblies in place and start all the cam holder bolts. Be sure the rocker arms are properly positioned and turn each bolt in sequence 2 turns at a time until the holders are seated on the head. Follow this procedure to avoid damaging the camshaft and rocker assemblies.
  10.  
  11. When all the camshaft and rocker holders are seated, tighten the bolts in the same sequence. Tighten the 8mm bolts to 16 ft. lbs. (22 Nm) and the 6mm bolts to 104 inch lbs. (12 Nm).
  12.  
  13. Install or connect the following:

    Cylinder head
     
    Negative battery cable
     

  14.  
  15. Check for proper engine and valve train operation.

    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-CL with 3.2L engine

  16.  

Integra Models With 1.8L (B18b1) Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Spark plug wires
     
    Cylinder head cover
     
    Timing belt cover
     
    Timing belt
     
    Distributor
     

  4.  
  5. Install 5.0mm pin punches to the No.1 camshaft holders, then remove the camshaft sprockets.
  6.  
  7. Loosen the valve adjusters to remove as much spring tension as possible.
  8.  
  9. Remove the pin punches from the camshaft holders.
  10.  
  11. To remove the camshaft bearing caps, loosen each bolt 2 turns at a time in a crisscross pattern to avoid damage to the valves or rockers. Mark the caps so they can be replaced in their original position.
  12.  
  13. Lift the camshafts from the cylinder head, wipe them clean and inspect the lift ramps. Replace the camshafts and rockers if the lobes are pitted, scored or excessively worn.
  14.  
  15. Label the rocker arms before removing so they can be installed in their original locations.
  16.  
  17. Remove the rocker arms.
  18.  

To install:

  1. Check the following before installing the camshafts:
    1. Be certain the keyways on the camshafts are facing UP (No. 1 cylinder at TDC).
    2.  
    3. The valve adjuster locknuts should be loosened and the adjusting screws backed off before installation.
    4.  

  2.  
  3. Lubricate the rocker arms and camshafts with clean engine oil.
  4.  
  5. Place the rocker arms on the pivot bolts and the valve stems, making sure that the rocker arms are in their original positions.
  6.  
  7. Install the camshaft seals with the open side (spring) facing in. Lubricate the lip of the seal.
  8.  
  9. Be sure the keyways on the camshafts are facing up and install the camshafts to the cylinder head.
  10.  
  11. Apply liquid gasket to the head mating surfaces of the No. 1 and No. 6 camshaft holders, then install them along with Nos. 2, 3, 4 and 5 camshaft holders. The arrows stamped on the holders should point toward the timing belt. Do not apply oil to the holder mating surface where the camshaft seals are housed.
  12.  
  13. Tighten the camshaft holders temporarily and be sure that the rocker arms are properly positioned.
  14.  
  15. Press the oil seals into the No.1 camshaft holders with a seal driver.
  16.  
  17. Tighten the bolts in a crisscross pattern to 84 inch lbs. (10 Nm). Check that the rockers do not bind on the valves.
  18.  
  19. Install the cylinder head plug to the end of the cylinder head. If the plug has alignment marks, align the marks.
  20.  
  21. Install the rear timing belt cover and tighten the bolts to 108 inch lbs. (12 Nm).
  22.  
  23. Install 5.0mm pin punches to the No.1 camshaft holders, then install the camshaft pulley keys onto the grooves in the camshafts.
  24.  
  25. Push the camshaft pulleys onto the camshafts, then tighten the retaining bolts to 27 ft. lbs. (38 Nm).
  26.  
  27. Install the timing belt and timing belt covers. Remove the pin punches from the camshaft holders.
  28.  
  29. Adjust the valves and pour oil over the camshafts and rocker arms.
  30.  
  31. Apply liquid gasket to the rubber seal at the 8 corners of the recesses.
  32.  
  33. Install the cylinder head cover and engine ground cable. Be sure the contact surfaces are clean and do not touch surfaces where liquid gasket has been applied.
  34.  
  35. Tighten the cylinder head cover nuts in 2-3 steps. In the final step, tighten all nuts in sequence, to 84 inch lbs. (10 Nm).
  36.  
  37. Install the distributor to the cylinder head and reconnect the spark plug wires to the spark plugs.
  38.  
  39. Connect the negative battery cable and enter the radio security code.
  40.  
  41. Change the engine oil. Wait at least 20 minutes for the sealant to cure before filling the engine with oil.

    Click image to see an enlarged view

    Fig. Rocker arms and shafts-1.8L (B18B1, B18C1, and B18C5) engines



    Click image to see an enlarged view

    Fig. Rocker arms with rubber band installed-1.8L (B18B1, B18C1 and B18C5) engines

  42.  

Integra Models With 1.8L (B18c1, B18c5) Engines & NSX
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Cylinder head from the vehicle
     

  4.  
  5. Hold each rocker arm assembly together with a rubber band to prevent them from separating.
  6.  
  7. Remove or disconnect the following:

    Intake and exhaust rocker shaft orifices from the cylinder head-The rocker shaft orifices are different and should be identified when removed. Discard the O-rings on the orifices.
     
    VTEC solenoid from the cylinder head and discard the filter
     

  8.  
  9. Insert 12mm bolts into the rocker arm shafts.
  10.  
  11. Remove each rocker arm set while slowly pulling out the rocker arm shaft.
    NOTE
    Tag each rocker arm set to assure installation in their original locations.

  12.  
  13. Inspect the rocker arm pistons. If they do not move smoothly, replace the rocker arm assembly.
  14.  
  15. Remove the lost motion assembly from the cylinder head. Inspect the lost motion assembly by pushing the plunger with your finger. Replace the lost motion assembly if it does not move smoothly.
  16.  

To install:

  1. Install the lost motion assembly to the cylinder head.
  2.  
  3. Apply engine oil to the rocker arm pistons, then bundle the rocker arms with a rubber band. Apply a light coat of clean engine oil to the rocker arms.
  4.  
  5. Position the rocker arms in their original locations, if they are being reused. If new assembles are being used place them in the cylinder head.
  6.  
  7. Lightly coat the rocker arm shafts with clean engine oil, then install the rocker arm shafts into the cylinder head. A 12mm bolt can be installed into the end of the rocker arm shafts to aid in their installation. Be sure to install the shafts in the proper positions. Remove the 12mm bolts from the rocker arm shafts.
  8.  
  9. Clean and install the rocker arm shaft orifices with new O-rings. If the holes in the rocker arm shafts are not aligned screw a 12mm bolt into the end of the shaft to position the it.
  10.  
  11. Install the sealing bolts with new washers and tighten them to 47 ft. lbs. (64 Nm).
  12.  
  13. Install the cylinder head into the vehicle.
  14.  

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

    Negative battery cable
     
    Cylinder head from the vehicle
     
    Loosen the rocker arm adjusting screws
     
    Camshaft holder bolts, 2 turns at a time in a criss-cross pattern

    Click image to see an enlarged view

    Fig. Loosen the rocker arm adjusting screws (A)-2.0L engines



    Click image to see an enlarged view

    Fig. Camshaft holder bolt loosening sequence-2.0L engines

     
    Timing chain guide B, camshaft holders and camshafts
     

  4.  
  5. Insert the bolts into the rocker shaft holder, then remove the rocker arm assembly.

    Click image to see an enlarged view

    Fig. Insert the bolts (A) into the rocker shaft holder, then remove the rocker arm assembly (B)-2.0L engines

  6.  
  7. Disassemble the rocker shafts as necessary.

    Click image to see an enlarged view

    Fig. Rocker arm disassembly-2.0L (K20A3) engine



    Click image to see an enlarged view

    Fig. Rocker arm disassembly-2.0L (K20A2) engine

  8.  

To install:

  1. Clean and dry the No. 5 rocker shaft holder mating surface.
  2.  
  3. Apply liquid gasket part No. 08718-0009 evenly to the cylinder head mating surface of the No. 5 rocker shaft holder and install within 5 minutes.
  4.  
  5. Reassemble the rocker arm assembly.
  6.  
  7. Insert the bolts into the rocker shaft holder, then install the rocker arm assembly on the cylinder head. Remove the bolts from the rocker shaft holder.
  8.  
  9. Make sure the punch marks on the VTC actuator and exhaust camshaft sprocket are facing up, then set the camshafts in the holder.
  10.  
  11. Set the camshaft holders and timing chain guide B in place.
  12.  
  13. Tighten the bolts, in sequence, to the following specifications:

    8mm bolts: 16 ft. lbs. (22 Nm)
     
    6mm bolts (nos. 21, 22 & 23): 104 inch lbs. (12 Nm)

    Click image to see an enlarged view

    Fig. Rocker arm assembly tightening sequence-2.0L engines

     

  14.  
  15. Install or connect the following:

    Timing chain, then adjust the valve clearance
     
    Cylinder head
     
    Negative battery cable
     

  16.  
  17. Check for proper engine and valve train operation.
  18.  

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

    Timing chain
     
    Loosen the rocker arm adjusting screws
     
    Camshaft holder bolts, two turns at a time in sequence

    Click image to see an enlarged view

    Fig. Camshaft holder bolt loosening sequence-TSX models

     
    Timing chain guide (B), camshaft and camshafts
     

  4.  
  5. Insert the bolts (A) into the rocker shaft holder, then remove the rocker arm assembly (B)

    Click image to see an enlarged view

    Fig. Insert the bolts (A) into the rocker shaft holder, then remove the rocker arm assembly (B)-TSX models



    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-TSX models

  6.  

To install:

  1. Clean and dry the No. 5 rocker shaft holding mating surface.
  2.  
  3. Apply a suitable liquid gasket P/N 08718-0009, or equivalent, evenly to the cylinder head mating surface of the No. 5 rocker shaft holder.
    NOTE
    The parts must be installed within 5 minutes of applying the liquid gasket.

  4.  
  5. Reassemble the rocker arm assembly, as necessary.
  6.  
  7. Install or connect the following

    Bolts (A) into the rocker shaft holder, then the rocker arm assembly on the cylinder head. Remove the bolts from the rocker shaft holder.
     

  8.  
  9. Make sure the punch marks on the variable valve timing control (VTC) actuator and exhaust camshaft sprocket are facing up, then set the camshafts (A) in the holder

    Click image to see an enlarged view

    Fig. When installing the camshafts (A) make sure the punch marks on the VTC actuator and exhaust cam sprockets are facing up-TSX models

  10.  
  11. Set the camshaft holders (B) and timing chain guide B (C) in place.
  12.  
  13. Tighten the bolts, in sequence, to the following specification:
    1. 8mm bolts: 16 ft. lbs. (22 Nm)
    2.  
    3. 6mm bolts: 104 inch lbs. (12 Nm)

      Click image to see an enlarged view

      Fig. Rocker arm assembly bolt tightening sequence-TSX models

    4.  

  14.  
  15. Install the timing chain and adjust the valve lash.
  16.  

 
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