VTEC Rocker Arm Test

Special Tools Required 

• Air pressure regulator 07AAJ-PNAA100
• Gauge joint adapter 07LAK-PR3A101
• VTEC air adapter (2) 07ZAJ-PNAA 100
• Air joint adapter 07ZAJ-PNAA300

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 step  2 ).
4. Move the secondary rocker arm (A) for No. 1 cylinder. The secondary rocker arm should move independently of the mid rocker arm (B).
   • If the secondary rocker arm moves independently of the mid rocker arm, go to step 5.
   • If the secondary rocker arm does not move, remove the mid, primary, and secondary rocker arms as an assembly, and check that the pistons in the mid and primary rocker arms move smoothly. If any rocker arm needs replacing, replace the mid, primary, and secondary rocker arms as an assembly.
     Fig 1: Moving Secondary Rocker Arm

     Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Repeat step  4 on the remaining rocker arms with each piston at TDC. When all the secondary rocker arms pass the test, go to step 6
6. Check that the air pressure on the shop air compressor gauge indicator is over 400 kPa (4 kgf/cm² , 57 psi).
7. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT  ).
8. Remove the No. 3 and No. 4 camshaft holder bolts, and install the VTEC air adapters (A) finger-tight.
   Fig 2: Installing VTEC Air Adapters

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Install the gauge joint adapter (B) to the inspection hole (C).
10. Connect the air joint adapter (D) to the VTEC air adapters.
11. Connect the air pressure regulator (E) to the air joint adapter.
12. Loosen the valve on the regulator, then apply the specified air pressure.

    Specified Air Pressure: 

    290 kPa (3.0 kgf/cm ²  ,42 psi) 

    NOTE: If the synchronizing piston does not move after applying air pressure, move the primary and secondary rocker arms up and down manually by rotating the crankshaft clockwise.
13. With the specified air pressure applied and the piston at TDC, move the secondary rocker arm (A). The mid rocker arm (B), primary rocker arm (C), and secondary rocker arm should move together.
    • If the three rocker arms move together, go to step 14.
    • If the three rocker arms does not move together, remove the mid, primary, and secondary rocker arms an assembly, and check that the pistons in the mid and primary rocker arms move smoothly. If rocker arm needs replacing, replace the mid, primary, and secondary rocker arms as an assembly.
      Fig 3: Moving Mid Rocker Arm, Primary Rocker Arm And Secondary Rocker Arm

      Courtesy of AMERICAN HONDA MOTOR CO., INC.
14. Repeat step  13 the remaining intake rocker arms with each piston at TDC. When all the rocker arms pass the test, go to step 15.
15. Remove the special tools.
16. Tighten the camshaft holder bolts to 22 N.m (2.2 kgf.m, 16 lbf.ft).
17. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION  ).