Honda Accord/Prelude 1984-1995 Repair Guide

Rocker Arms/Shafts

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REMOVAL & INSTALLATION



SOHC 4-Cylinder Engines

See Figures 1, 2, 3 and 4

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the valve cover and bring the No. 1 cylinder to TDC on the compression stroke.
  4.  
  5. Loosen the adjusting screws on the rocker arms.
  6.  
  7. Relieve the tension on the timing belt.
  8.  
  9. Remove the rocker arm assembly retaining bolts. Unscrew the bolts 2 turns at a time, in a crisscross pattern, to prevent damaging the valves or rocker assembly. The tension must be released evenly and constantly.
  10.  
  11. Remove the rocker arm/shaft assemblies. Leave the rocker arm bolts in place as the shafts are removed to keep the bearing caps, springs and rocker arms in place on the shafts.
  12.  
  13. If the rocker arms or shafts are to be replaced, identify the parts as they are removed from the shafts to insure reinstallation in the original location.
  14.  

To install:
  1. Lubricate the camshaft journals and lobes.
  2.  
  3. Set the rocker arm assembly in place and loosely install the bolts. Tighten each bolt 2 turns at a time in the proper sequence to insure that the rockers do not bind on the valves. Tighten the 6mm bolts to 9 ft. lbs. (12 Nm) and the 8mm bolts to 16 ft. lbs. (22 Nm).
  4.  



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Fig. Fig. 1: Rocker shaft bolt tightening sequence-1984-91 Prelude and 1984-89 Accord



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Fig. Fig. 2: Rocker shaft bolt tightening sequence-1992-95 Preludes and 1990-95 Accords without VTEC



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Fig. Fig. 3: Rocker shaft bolt tightening sequence-VTEC models

  1. Tension the timing belt.
  2.  
  3. Adjust the valve lash.
  4.  
  5. Install the valve cover and connect the negative battery cable.
  6.  



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Fig. Fig. 4: Always use a torque wrench to tighten the rocker shaft bolts

DOHC Engines
EXCEPT VTEC
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the valve cover and bring the No. 1 cylinder to TDC.
  4.  
  5. Remove the timing belt cover and the timing belt.
  6.  
  7. Remove the camshaft bearing caps and remove the camshafts.
  8.  
  9. Remove the rocker arms.
  10.  

To install:
  1. Make certain the keyways on the camshafts are facing up. Valve locknuts should be loosened and the adjusting screws backed off before installation.
  2.  
  3. Place the rocker arms on the pivot bolts and valve stems.
  4.  
  5. Install the camshafts and seals. The seals should be installed with the open or spring side facing inward.
  6.  
  7. Note that the cam retainers are marked I (intake) or E (exhaust) and consecutively numbered to indicate correct placement. Do not apply oil to the surfaces of the holders which mate with the seals. Apply a liquid gasket or sealer to the head mating surfaces for the No. 1 and No. 6 camshaft holders.
  8.  
  9. Install the camshaft holders.
  10.  
  11. Tighten the camshaft holders temporarily. Make sure the rocker arms are properly positioned on the valve stems.
  12.  
  13. Use a seal driver of the correct size to install the camshaft oil seals.
  14.  
  15. Tighten the bolts two turns at a time, using the correct sequence. Bring each bolt to the correct tension. Please refer to the camshaft procedures in this section.
  16.  
  17. Install the timing belt and covers.
  18.  
  19. Adjust the valve lash.
  20.  
  21. Reinstall the valve cover.
  22.  

VTEC

See Figures 5 and 6

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the valve cover.
  4.  
  5. Remove the timing belt.
  6.  
  7. Remove the camshafts.
  8.  
  9. Remove the cylinder head from the vehicle.
  10.  
  11. Remove the VTEC solenoid valve and filter from the head.
  12.  
  13. Hold the rocker arms together with a rubber band to prevent them from separating.
  14.  
  15. Remove the intake and exhaust rocker shaft orifices. Note that their shapes are different. Mark the parts as they are removed to ensure correct installation later.
  16.  
  17. Remove the sealing bolts from the end of the head. Discard the washers.
  18.  
  19. Screw 12mm bolts into the rocker arm shafts. Remove each rocker arm while slowly pulling out the intake and exhaust rocker arm shafts. Mark the parts as they are removed to ensure reinstallation in the proper locations.
  20.  



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Fig. Fig. 5: Removing the rocker arms from the engine. Note the rubber band holding the rocker arm assembly together

To install:
  1. Clean all parts in solvent, dry them and apply lubricant to any contact points.
  2.  
  3. The rocker locknuts should be loosened and the adjusting screws backed off before installation.
  4.  
  5. Install the rocker arms in their original locations while passing the rocker arm shaft through the cylinder head. Remove the rubber bands after installing the rockers.
  6.  



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Fig. Fig. 6: Always use new washers and O-rings when assembling the rocker arms

  1. Using new O-rings, install the rocker shaft orifices in their correct locations. After installing the orifices, try to turn the shaft to make sure the orifice has been inserted in the hole of the rocker shaft correctly. If the orifice is in place, it should not turn.
  2.  
  3. Install the sealing bolts with new washers. Tighten them to 43 ft. lbs. (60 Nm).
  4.  
  5. Install the VTEC solenoid valve with a new filter. Tighten the bolts to 9 ft. lbs. (12 Nm).
  6.  
  7. Install the cylinder head on the engine, then install the camshafts.
  8.  
  9. Install the timing belt.
  10.  
  11. Adjust the valve lash.
  12.  
  13. Install the rocker cover and connect the negative battery cable.
  14.  

Accord V-6
INNER ROCKER ARMS

See Figure 7

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arm and side covers.
  4.  
  5. Remove the camshafts. Refer to the procedure outlined in this section.
  6.  
  7. Remove the intake rocker arms, inner exhaust rocker arms and pushrods. Identify the parts as they are removed to ensure reinstallation in the proper locations.
  8.  



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Fig. Fig. 7: Inner rocker arms and pushrods used on the Accord V-6

  1. If necessary, remove the rocker arm guides by removing the bolts securing them to the head. The bolts are of different lengths; be sure to mark them for correct installation later.
  2.  

To install:
  1. If necessary, install the rocker arm guides. Tighten the bolts to 9 ft. lbs. (12 Nm). Be sure the bolts are installed in their correct locations.
  2.  
  3. Clean all parts in solvent, dry them and apply lubricant to any contact points.
  4.  
  5. If the hydraulic tappets were removed, bleed them using the procedure found later in this section.
  6.  
  7. Position the rocker arms and pushrods in their correct locations.
  8.  
  9. Install the camshafts. Refer to the procedure outlined in this section.
  10.  
  11. Adjust the exhaust rocker arms as described in the shaft-mounted arm procedure.
  12.  
  13. Install the rocker arm and side covers. Connect the negative battery cable.
  14.  

SHAFT-MOUNTED ARMS

See Figure 8

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cylinder head(s) from the engine.
  4.  

Identify the parts as they are removed to ensure reinstallation in the proper locations.

  1. Remove the 22mm sealing bolt from the end of the head. Discard the washer.
  2.  
  3. Remove the rocker shaft using a 12x1.25mm bolt. Remove the rockers and wave washers as the shaft is extracted from the head.
  4.  



Click image to see an enlarged view

Fig. Fig. 8: Shaft mounted rocker arm assembly

To install:
  1. Clean all parts in solvent, dry them and apply lubricant to any contact points.
  2.  
  3. If the hydraulic tappets were removed, bleed them using the procedure found later in this section.
  4.  
  5. Position the rocker arms and wave washers in their correct locations. Make sure the wave washers are firmly fitted to the cylinder head groove.
  6.  
  7. Carefully install the shaft into the cylinder head. Be careful not to damage the rockers or shaft when installing. Make sure the wave washers are still properly installed. Install the sealing bolt with a new washer and tighten to 36 ft. lbs. (49 Nm).
  8.  
  9. Install the cylinder head(s) and the timing belt. Do not install the side and rocker covers at this time.
  10.  
  11. Adjust the exhaust rocker arms as follows:
    1. Position the No. 1 piston at TDC on the compression stroke.
    2.  
    3. Loosen the locknuts on the exhaust rockers.
    4.  
    5. Tighten the adjusting screws for the No. 1, 2 and 4 cylinders. When you feel the screw contact the valve, tighten the screw 1 1 / 8 turn. Tighten the locknut to 14 ft. lbs. (20 Nm).
    6.  
    7. Rotate the crankshaft one turn clockwise, then tighten the adjusting screws for cylinders No. 3, 5 and 6. When you feel the screw contact the valve, tighten the screw 1 1 / 8 turn. Tighten the locknut to 14 ft. lbs. (20 Nm).
    8.  

  12.  
  13. Install the side and rocker covers. Connect the negative battery cable.
  14.  

 
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