VTEC Rocker Arm Test

Special Tools Required 

• VCM Air Adapter 070AJ-001A101
• VTEC Air Stop Tool A 07AAJ-R70A100
• VTEC Air Stop Tool B 07AAJ-R70A200
• Air Pressure Regulator 07AAJ-PNAA101

1. Start the engine and let it run for 5 minutes, then turn the ignition switch to LOCK (0).
2. Remove the six ignition coils and the six spark plugs (see IGNITION COIL REMOVAL/INSTALLATION ).
3. Remove the cylinder head covers (see CYLINDER HEAD COVER REMOVAL ).
4. 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 5.
   Fig 1: Identifying Mid, Primary, And Secondary Intake Rocker Arms

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Check that the air pressure on the shop air compressor gauge indicates over 981 kPa (10.0 kgf/cm² , 142.3 psi).
6. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT ).
7. 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.
   Fig 2: Identifying Intake Rocker Shaft Mounting Bolts - Front

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Remove the sealing bolts, then install VTEC air stop tool A and the VCM air adapter (B) to the inspection hole, then connect the air pressure regulator (C) as shown.
   Fig 3: Identifying Intake Rocker Shaft Mounting Bolts - Rear

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. 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) 

10. 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 11.
    Fig 4: Identifying Intake Primary Rocker Arm And Intake Secondary Rocker Arm

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Remove the air pressure regulator, the VCM air adapter, VTEC air stop tool A, and VTEC air stop tool B.
12. Torque the sealing bolts to 22 N.m (2.2 kgf.m, 16 lbf.ft).
13. Install the cylinder head covers (see CYLINDER HEAD COVER INSTALLATION ).
14. Install the six spark plugs and the six ignition coils (see IGNITION COIL REMOVAL/INSTALLATION ).