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Home >> Acura >> 2020 >> MDX Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control And Engine Mechanical - Service, Testing And Troubleshooting (Except Hybrid) >> Test >> Variable Cylinder Management Rocker Arm Test >> Test
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Variable Cylinder Management Rocker Arm Test: Test

  1. Ignition Coil and Spark Plug - Remove
  2. Cylinder Head Cover - Remove
  3. VTEC Rocker Arm - Test
    GHH320064Courtesy of HONDA, U.S.A., INC.
    		 Front Bank 

    1. Rotate the crankshaft pulley clockwise. Make sure that the intake primary rocker arm (A) should move independently of the intake secondary rocker arm (B):

    • If the intake primary and secondary rocker arms do not move independently, remove the intake primary and secondary rocker arms 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 and secondary rocker arms move independently, go to step 2.
    GHH320065Courtesy of HONDA, U.S.A., INC.
    		 Rear Bank 

    2. Rotate the crankshaft pulley clockwise. Make sure that the intake primary rocker arm (A) and the intake secondary L rocker arm (B) should move together, on the other hand, intake primary rocker arm and the intake secondary H rocker arm (C) should move independently:

    • If the intake primary and secondary L rocker arms do not move together, remove the intake primary, secondary L and H rocker arms as an assembly, and check that the pistons in the rocker arms move smoothly. If any intake rocker arm needs replacing, replace the intake primary, secondary rocker arms L and H as an assembly, then retest.
    • If the intake primary rocker arm and the intake secondary L rocker arms move together, go to step 3.
    GHH320066Courtesy of HONDA, U.S.A., INC.
    		 3. Rotate the crankshaft pulley clockwise. Make sure that the exhaust primary rocker arms (A) and the exhaust secondary rocker arms (B) are mechanically connected by the pistons and that the exhaust primary rocker arm and the exhaust secondary rocker arms should move together:
    • If the exhaust primary and secondary rocker arms do not move together, remove the exhaust primary and secondary rocker arms as an assembly, and check that the pistons in the rocker arms move smoothly. If any exhaust rocker arm needs replacing, replace the exhaust primary and secondary rocker arms as an assembly, then retest.
    • If the exhaust primary and secondary rocker arms move together, go to the next procedure.
  4. Air Pressure - Check
    1. Check that the air pressure on the shop air compressor gauge indicates over 690 kPa (7.04 kgf/cm 2, 100.1 psi).
  5. Valve Clearance - Inspect 
  6. VTEC/VCM Change Over - Test
    Front (VTEC) 
    GHH320067GHH320068GHH320069Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.

    Rear (VTEC) 

    GHH320067GHH320068GHH320069Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.

    Rear (VCM) 

    GHH320067GHH320068GHH320069Courtesy of HONDA, U.S.A., INC.HONDA, U.S.A., INC.HONDA, U.S.A., INC.
    		 1. Remove the sealing bolt, then install the VCM air adapter to the inspection hole and install VTEC air stop tool B, then connect the air pressure regulator as shown.

    2. Loosen the valve on the air pressure regulator, and apply the specified air pressure.
    Specified Air Pressure: 
    441-490 kPa (4.50-5.00 kgf/cm 2, 64.0-71.1 psi) 
    GHH320070Courtesy of HONDA, U.S.A., INC.
    		 Front (VTEC) 

    3. With the specified air pressure applied, rotate the crankshaft pulley clockwise. Make sure that the intake primary rocker arm (A) and the intake secondary rocker arm (B) are mechanically connected by the pistons and that the intake primary and secondary rocker arms should move together:

    • If the intake primary and secondary rocker arms move independently, remove the intake primary and secondary rocker arms 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 and secondary rocker arms move together, go to step 4.
    GHH320071Courtesy of HONDA, U.S.A., INC.
    		 Rear (VTEC) 

    4. With the specified air pressure applied, rotate the crankshaft pulley clockwise. Make sure that the intake primary rocker arm (A) and the intake secondary L and H rocker arms (B) are mechanically connected by the pistons and that the intake primary and secondary L and H rocker arms should move together:

    • If the intake primary and secondary L and H rocker arms move independently, remove the intake primary, secondary L and H rocker arms as an assembly, and check that the pistons in the rocker arms move smoothly. If any intake rocker arm needs replacing, replace the primary, secondary L and H rocker arms as an assembly, then retest.
    • If the intake primary and secondary L and H rocker arms move together, go to step 5.
    GHH320072Courtesy of HONDA, U.S.A., INC.
    		 Rear (VCM) 

    5. With the specified air pressure applied, rotate the crankshaft pulley clockwise. Make sure that the intake primary rocker arm (A) should move independently of the intake secondary L and H rocker arms (B). The exhaust primary rocker arms (C) should move independently of the exhaust secondary rocker arms (D):

    • If the intake primary, secondary L and H rocker arms do not move independently, remove the intake primary, secondary L and H as an assembly, and check that the pistons in the rocker arms move smoothly. If any intake rocker arm needs replacing, replace the primary, secondary L and H as an assembly, then retest.
    • If the exhaust primary and secondary rocker arms do not move independently, remove the exhaust primary and secondary rocker arms as an assembly, and check that the pistons in the rocker arms move smoothly. If any exhaust rocker arm needs replacing, replace the exhaust primary and secondary rocker arms as an assembly, then retest.
    • If the intake primary and secondary L and H rocker arms, and exhaust primary and secondary rocker arms move independently, go to next procedure.
  7. All Special Tools - Remove
  8. Sealing Bolt - Install
    1. Torque the new sealing bolts to 22 Nm (2.2 Kgf-m, 16 lbf.ft).
  9. Cylinder Head Cover - Install
  10. Ignition coil and spark plug - Install
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