VTEC Rocker Arm Test: Test

VTEC Rocker Arm Test

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1. Set the No. 1 piston at top dead center (TDC). The "UP" mark (A) on the camshaft sprocket should be at the top, and the TDC grooves (B) on the camshaft sprocket should line up with the top edge of the head.

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2. Push on the intake primary rocker arm (A) for the No. 1 cylinder. Make sure that the intake primary rocker arm and the intake secondary rocker arm (B) are mechanically connected by the rocker arm pistons and that the intake secondary rocker arm does not move when pushed manually:

If the intake secondary rocker arm moves independently, remove and disassemble the rocker arm assembly, and check that the rocker arm pistons between the intake primary and secondary rocker arms move smoothly. If any rocker arm or rocker arm piston needs replacing, replace the rocker arms for the cylinder as assembly, then retest.
If the intake secondary rocker arm does not move independently, go to step 3.

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3. Push on the exhaust primary rocker arm (A) for the No. 1 cylinder. Make sure that the exhaust primary rocker arm and the exhaust secondary rocker arm (B) are mechanically connected by the rocker arm pistons and that the exhaust secondary rocker arm does not move when pushed manually:

If the exhaust secondary rocker arm moves independently, remove and disassemble the rocker arm assembly, and check that the rocker arm pistons between the exhaust primary and secondary rocker arms move smoothly. If any rocker arm or rocker arm piston needs replacing, replace the rocker arms for the cylinder as an assembly, then retest.
If the exhaust secondary rocker arm does not move independently, go to step 4.

4. Inspect the valve clearance.

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5. Check that the air pressure on the shop air compressor gauge indicates over 340 kPa (34.7 kgf/cm² , 49.3 psi).

6. Install the VCM air adapter (A) to the inspection hole, then connect the air pressure regulator (B).

7. Loosen the valve on the air pressure regulator, and apply the specified air pressure.

Specified Air Pressure:

200 kPa (2.04 kgf/cm² , 29.0 psi)

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8. Move the intake secondary rocker arm (A) for the No. 1 cylinder. The intake secondary rocker arm should move independently of the intake primary rocker arm (B):

If the intake secondary rocker arm does not move independently, remove and disassemble the rocker arm assembly, and check that the rocker arm pistons between the intake primary and secondary rocker arms move smoothly. If any rocker arm or rocker arm piston needs replacing, replace the rocker arms for the cylinder as an assembly, then retest.
If the intake secondary rocker arm moves independently, go to step 9.

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9. Move the exhaust secondary rocker arm (A) for the No. 1 cylinder. The exhaust secondary rocker arm should move independently of the exhaust primary rocker arm (B):

If the exhaust secondary rocker arm does not move independently, remove and disassemble the rocker arm assembly, and check that the rocker arm pistons between the exhaust primary and secondary rocker arms move smoothly. If any rocker arm or rocker arm piston needs replacing, replace the rocker arms for the cylinder as an assembly, then retest.
If the exhaust secondary rocker arm moves independently, go to step 10.

10. Tighten the valve on the air pressure regulator, then remove the VCM air adapter

11. Repeat step 2 to 10 on the remaining cylinder's rocker arms with each piston at TDC. When all the rocker arms pass the test.