VTEC Rocker Arms
VTEC Rocker Arm TestSpecial Tools Required
^ Air Stopper 07LAJ-PR3020B
1. Set the No. 1 piston at TDC.
2. Remove the cylinder head cover.
3. Push on the intake mid rocker arm (A} for the No. 1 cylinder. The mid rocker arm should move independently of the intake primary rocker arm (B) and intake secondary rocker arm (C).
^ If the intake mid 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 primary, mid, and secondary rocker arms as an assembly, and test.
^ If the intake mid rocker arm moves freely, go to step 4.
4. Repeat step 3 on the remaining intake mid rocker arms with each piston at TDC. When all the mid rocker arms pass the test, go to step 5.
5. Check that the air pressure on the shop air compressor gauge indicates over 400 kPa (4 kgf/cm2, 57 psi).
6. Inspect the valve clearance.
7. Cover the timing belt with a shop towel to protect the belt.
8. Plug the relief hole with the air stopper (A).
9. Remove the sealing bolt (A) from the inspection hole (B), and connect an air pressure regulator with a 0 - 100 psi gauge (C).
NOTE: Remove any oil from the bolt threads and camshaft holder threads before retightening the sealing bolt.
10. Loosen the valve on the regulator, and apply the specified air pressure.
Specified Air Pressure: 400 kPa (4 kgf/cm2, 57 psi)
11. With the specified air pressure applied and the piston at TDC, push up the timing plate (A) 2 - 3 mm (0.08 - 0.12 inch) at the plate end then release it. The synchronizing piston will pop out and engage the intake mid, primary (B) and secondary (C) rocker arms.
Visually check the engagement of the synchronizing pistons A (D)/B (E). The synchronizing pistons can be seen in the gap between the mid (F), secondary (C) and primary (B) rocker arms.
NOTE:
^ With the timing plate (A) engaged in the groove on the timing piston (G), the piston is locked in the pushed out position.
^ Do not apply too much force when pushing up the timing plate.
12. Make sure that the intake primary (A) and secondary (B) rocker arms are mechanically connected by the pistons, and that the mid rocker arm (C) does not move when pushed manually. If any intake mid rocker arm moves independently of the intake primary and secondary rocker arms, replace the rocker arms as a set.
13. Stop applying air pressure. Push up the timing plate (A); the synchronizing pistons (B) will snap back to their original positions. Visually check the disengagement of the synchronizing pistons A/B. Replace the intake rocker arms as an assembly if either piston does not work correctly.
NOTE: When the timing plate is pushed up, it releases the timing piston (c), letting the return spring move the synchronizing pistons to their original positions.
14. Remove the special tools.
15. Check for smooth operation of each lost motion assembly by pushing down on each mid rocker arm. Replace any lost motion assembly that does not move smoothly.