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VTEC Rocker Arm Test

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required 

  1. Remove the six ignition coils and the six spark plugs. (see IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION ).
  2. Remove the cylinder head covers (see CYLINDER HEAD COVER REMOVAL  ).
  3. Rotate the crankshaft pulley clockwise, and visually check all the intake primary rocker arms (A) and the intake secondary rocker arms (B) moves independently:
    • If the intake primary rocker arm and the intake secondary rocker arm move together, remove the intake primary rocker arm and the intake secondary rocker arm as an assembly, and check that the pistons in the rocker arms move smoothly. If any intake rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest.
    • If the intake primary rocker arm and the intake secondary rocker arm move independently, go to step 4.
      Fig 1: Identifying Intake Primary Rocker Arms And Intake Secondary Rocker Arms
      G08052106Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Check that the air pressure on the shop air compressor gauge indicates over 981 kPa (10.0 kgf/cm2 , 142 psi).
  5. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT  ).
  6. Remove the sealing bolts, then install the VCM air adapter (A) and VTEC air stop tool B to the inspection hole, then connect the air pressure regulator (C) as shown.

    FRONT 

    Fig 2: Connecting Air Pressure Regulator (Front)
    G08052107Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Remove the sealing bolts, then install the VTEC air stop tool A and the VTEC air adapter (B) to the inspection hole, then connect the air pressure regulator (C) as shown.

    REAR 

    Fig 3: Connecting Air Pressure Regulator (Rear)
    G08052108Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Loosen the valve on the regulator, and apply the specified air pressure.

    Specified Air Pressure: 

    550-690 kPa (5.6-7.0 kgf/cm 2  , 80-100 psi) 

  9. With the specified air pressure applied, rotate the crankshaft pulley clockwise, and visually check all the intake primary rocker arms (A) and the intake secondary rocker arms (B) move together:
    • If the intake primary rocker arm and the intake secondary rocker arm move independently, remove the intake primary rocker arm and the intake secondary rocker arm as an assembly, and check that the pistons in the rocker arms move smoothly. If any intake rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest.
    • If the intake primary rocker arm and the intake secondary rocker arm move together, go to step 10.
      Fig 4: Identifying Intake Primary Rocker Arms And Intake Secondary Rocker Arms
      G08052109Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Remove the air pressure regulator, the VCM air adapter, the VTEC air stop tool A, and the VTEC air stop tool B.
  11. Torque the sealing bolts to 22 N.m (2.2 kgf.m, 16 lbf.ft).
  12. Install the cylinder head covers (see CYLINDER HEAD COVER INSTALLATION  ).
  13. Install the six spark plugs and the six ignition coils (see IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION ).
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