VTEC Rocker Arm Test

Special Tools Required 

• Air pressure regulator 07AAJ-PNAA100
• VTEC air adapter 07VAJ-P8A010A
  1. Start the engine and let it run for 5 minutes, then turn the ignition switch OFF.
  2. Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL ).
  3. Set the No. 1 piston at top dead center (TDC) (see VALVE CLEARANCE ADJUSTMENT ).
  4. Move the primary rocker arm (A) for No. 1 cylinder. The primary rocker arm should move independently of the secondary rocker arm (B).
     • If the primary rocker arm does not move, remove the primary and secondary rocker arms as an assembly, and check that the piston in the secondary rocker arm moves smoothly.
     • If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly.
     Fig 1: Replacing Primary And Secondary Rocker Arms Assembly

     Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Repeat step  4 on the remaining primary rocker arms with each piston at TDC. When all the primary rocker arms pass the test, go to step 6.
  6. Check that the air pressure on the shop air compressor gauge indicates over 400 kPa (4 kgf/cm² , 57 psi).
  7. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT ).
  8. Remove a rocker shaft mounting bolt (A), then connect the VTEC air adapter (B) and the VTEC air pressure regulator (C) to the bolt hole.
     Fig 2: Removing Rocker Shaft Mounting Bolt

     Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Loosen the valve on the regulator, and apply the specified air pressure.
     NOTE: If the synchronizing piston does not move after applying air pressure; move the primary or secondary rocker arm up and down manually by rotating the crankshaft clockwise.

     Specified Air Pressure: 

     250 kPa (2.5 kgf/cm ²  ,36 psi) 

  10. With the specified air pressure applied and the piston at TDC, move the primary rocker arm (A). The primary rocker arm and secondary rocker arm (B) should move together. If the primary and secondary rocker arms do not move together, replace the rocker arms as a set.
      Fig 3: Identifying Rocker Arm

      Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Repeat step  9 and  10 for the remaining cylinders. Be sure to set the cylinder's piston at TDC before beginning work.
  12. Remove the special tools.
  13. Tighten the rocker shaft mounting bolt to 22 N.m (2.2 kgf.m, 16 lbf.ft)
  14. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION ).