VTEC Rocker Arm Test

Special Tools Required 

• Air pressure regulator 07AAJ-PNAA101
• VTEC air adapter 07ZAJ-PNAA101
• VTEC air stopper 07ZAJ-PNAA200
• 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  5 ).
4. Verify that the intake primary rocker arm (A) moves independently of the intake secondary rocker arm (B).
   • If the intake primary rocker arm does not move, remove the primary and secondary rocker arms as an assembly and check that the pistons in the secondary and primary rocker arms move smoothly (see ROCKER ARM AND SHAFT INSPECTION ). If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest.
   • If the intake primary rocker arm moves freely, go to step  5.
   Fig 1: Checking Intake Primary Rocker Arm

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Repeat step  4 on the remaining intake 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 the sealing bolt (A) from the relief hole, and install the VTEC air stopper (B).
   Fig 2: Identifying VTEC Air Stopper, Air Joint Adapter And Air Pressure Regulator

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Remove the No. 2 and No. 3 camshaft holder bolts, and install the VTEC air adapters (C) finger-tight.
10. Connect the air joint adapter (D) and air pressure regulator (E).
11. Loosen the valve on the regulator, and 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 or secondary rocker arm up and down manually by rotating the crankshaft clockwise.
12. With the specified air pressure applied, move the intake primary rocker arm (A) for the No. 1 cylinder. The primary rocker arm and secondary rocker arm (B) should move together.

    If the intake secondary rocker arm does not move, 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: Moving Intake Primary Rocker Arm

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. Remove the special tools.
14. Tighten the camshaft holder mounting bolts to 22 N.m (2.2 kgf.m, 16 lbf.ft).
15. Tighten the sealing bolt to 20 N.m (2.0 kgf.m, 14 lbf.ft).
16. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION ).