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Home › Honda › 2012 › CR-Z Base, Standard Trans › Repair and Diagnosis › Engine Mechanical › Mechanical › Cylinder Head › VTEC Rocker Arm Test

VTEC Rocker Arm Test

Special Tools Required 

  1. Start the engine, and let it run for 5 minutes, then turn the ignition switch to LOCK (0).
  2. Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL  ).
  3. Rotate the crankshaft clockwise, and visually check that all the primary rocker arms (A) and secondary rocker arms (B) move freely.
    • If the primary rocker arm and secondary rocker arm move together, remove the primary and secondary rocker arms as an assembly, and check that the pistons in the primary and secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest.
    • If all the primary rocker arms and secondary rocker arms move freely, go to step  4.
      Fig 1: Locating Primary Rocker Arms And Secondary Rocker Arms
      G06949365Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Check that the air pressure on the shop air compressor gauge indicates over 340 kPa (3.47 kgf/cm2 , 49.3 psi).
  5. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT  ).
  6. Install the VCM air adapter (A) to the inspection hole, then connect the air pressure regulator (B).
    Fig 2: Installing VCM Air Adapter To Inspection Hole
    G06949366Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Loosen the valve on the regulator, and apply the specified air pressure.

    Specified Air Pressure: 

    340 kPa (3.47 kgf/cm 2  , 49.3 psi) 

  8. With the specified air pressure applied, rotate the crankshaft clockwise, and visually check that all the primary rocker arms (A) and the secondary rocker arms (B) move together.

    If the primary rocker arm and secondary rocker arm move freely and independently of each other, remove the primary and secondary rocker arms as an assembly, and check that the pistons in the primary and secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, and test.

    Fig 3: Locating Primary Rocker Arms And Secondary Rocker Arms
    G06949367Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Remove the air pressure regulator and the VCM air adapter.
  10. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION  ).
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