VTEC Rocker Arm Test

Special Tools Required 

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

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 TIMING BELT ADJUSTER REPLACEMENT ).
3. Rotate the crankshaft pulley clockwise, and visually check all intake primary rocker arms (A) and 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

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. Rotate the crankshaft pulley clockwise, and visually check all exhaust primary rocker arms (A) and exhaust secondary rocker arms (B) move independently:
   • If the exhaust primary rocker arm and the exhaust primary rocker arm move together, remove the exhaust primary rocker arm and the exhaust secondary rocker arm as an assembly, and check that the pistons in the rocker arms move smoothly. If any exhaust rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest.
   • If the exhaust primary rocker arm and the exhaust secondary rocker arm move independently, go to step 5.
   Fig 2: Identifying Exhaust Primary Rocker Arms And Exhaust Secondary Rocker Arms

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Inspect the valve clearance (see VALVE CLEARANCE ADJUSTMENT ).
6. Check that the air pressure on the shop air compressor gauge indicates over 981 kPa (10.0 kgf/cm² , 142 psi).
7. Remove the sealing bolts from the front cylinder head, then install the VTEC/VCM air adapter (A) to the inspection hole and install the VTEC air stop tool B, then connect the air pressure regulator (C).
   Fig 3: Installing VTEC Air Stop Tool

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Remove the sealing bolts from the rear cylinder head, then install the VTEC air stop tool A to the inspection hole and install the VTEC/VCM air adapter (B), then connect the air pressure regulator (C).
   Fig 4: Installing VTEC/VCM Air Adapter

   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 intake primary rocker arms (A) and 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 5: Identifying Intake Primary Rocker Arms And Intake Secondary Rocker Arms

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. With the specified air pressure applied, rotate the crankshaft pulley clockwise. The exhaust primary rocker arms (A) should move together with the exhaust secondary rocker arms (B):
    • If the exhaust primary rocker arm and the exhaust secondary rocker arm move independently, remove the exhaust primary rocker arm and the exhaust secondary rocker arm as an assembly, and check that the pistons in the rocker arms move smoothly. If any exhaust rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest.
    • If the exhaust primary rocker arm and the exhaust secondary rocker arm move together, go to step 12.
    Fig 6: Identifying Exhaust Secondary Rocker Arms

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Remove the air pressure regulator, the VTEC/VCM air adapter, the VTEC air stop tool A, and the VTEC air stop tool B.
13. Tighten the sealing bolts to 22 N.m (2.2 kg.m, 16 lb.ft).
14. Install the cylinder head covers (see REAR ).
15. Install the six spark plugs and the six ignition coils (see IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION ).