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Valve Clearance Adjustment

NOTE: Adjust the valves only when the cylinder head temperature is less than 100°F (38°C).
  1. Remove the intake manifold (see REMOVAL ).
  2. Remove the cylinder head covers (see TIMING BELT DRIVE PULLEY REPLACEMENT  ).
  3. Set the No. 1 piston at top dead center (TDC). Align the pointer (A) on the front upper cover with the No. 1 piston TDC mark (B) on the front camshaft pulley.
    Fig 1: Aligning Pointer On Front Upper Cover With No. 1 Piston TDC Mark On Front Camshaft Pulley
    G04545564Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Select the correct thickness feeler gauge for the valves you're going to check.

    Intake: 0.20-0.24 mm (0.008-0.009 in.) 

    Exhaust: 0.28-0.32 mm (0.011-0.013 in.) 

    REAR: 

    Fig 2: Identifying Intake/Exhaust Valves (Rear)
    G04545565Courtesy of AMERICAN HONDA MOTOR CO., INC.

    FRONT: 

    Fig 3: Identifying Intake/Exhaust Valves (Front)
    G04545566Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Insert the feeler gauge (A) between the adjusting screw and the end of the valve stem on No. 1 cylinder and slide it back and forth; you should feel a slight amount of drag.
    Fig 4: Inserting Feeler Gauge Between Adjusting Screw And End Of Valve Stem On No. 1 Cylinder
    G04545567Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. If you feel too much or too little drag, loosen the locknut (A), and turn the adjusting screw (B) until the drag on the feeler gauge is correct.
    Fig 5: Loosening Locknut
    G04545568Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Tighten the locknut and recheck the clearance. Repeat the adjustment, if necessary.
  8. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 4 piston TDC mark (B) on the front camshaft pulley.
    Fig 6: Aligning Pointer On Front Upper Cover With No. 4 Piston TDC Mark On Front Camshaft Pulley
    G04545569Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
  10. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 2 piston TDC mark (B) on the front camshaft pulley.
    Fig 7: Aligning Pointer On Front Upper Cover With No. 2 Piston TDC Mark On Front Camshaft Pulley
    G04545570Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
  12. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 5 piston TDC mark (B) on the front camshaft pulley.
    Fig 8: Aligning Pointer On Front Upper Cover With No. 5 Piston TDC Mark On Front Camshaft Pulley
    G04545571Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Check and, if necessary, adjust the valve clearance on No. 5 cylinder.
  14. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 3 piston TDC mark (B) on the front camshaft pulley.
    Fig 9: Aligning Pointer On Front Upper Cover With No. 3 Piston TDC Mark On Front Camshaft Pulley
    G04545572Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
  16. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 6 piston TDC mark (B) on the front camshaft pulley.
    Fig 10: Aligning Pointer On Front Upper Cover With No. 6 Piston TDC Mark On Front Camshaft Pulley
    G04545573Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Check and, if necessary, adjust the valve clearance on No. 6 cylinder.
  18. Install the cylinder head covers (see CYLINDER HEAD COVER INSTALLATION  ).
  19. Install the intake manifold (see INSTALLATION ).
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