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Valve Clearance Adjustment

NOTE: Connect the HDS to the DLC (see step 2 on GENERAL TROUBLESHOOTING INFORMATION ), and monitor ECT sensor 1. Adjust the valve clearance only when the ECT is less than 100°F (38°C).
  1. Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL  ).
  2. 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.
    Fig 1: Locating UP Mark On Camshaft Sprocket And TDC Grooves On Camshaft Sprocket
    G06949368Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Select the correct feeler gauge for the valve clearance you are going to check.

    Valve Clearance 

    Intake: 0.15-0.19 mm (0.006-0.007 in) 

    Exhaust: 0.26-0.30 mm (0.010-0.011 in) 

    Fig 2: Locating Valve Clearance
    G06949369Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. 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 3: Inserting Feeler Gauge Between Adjusting Screw And End Of Valve Stem On No. 1 Cylinder
    G06949370Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. If you feel too much or too little drag, loosen the locknut, and turn the adjusting screw (A) until the drag on the feeler gauge is correct.
    Fig 4: Turning Adjusting Screw Until Drag On Feeler Gauge
    G06949371Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. While holding the adjusting screw with the screw driver, tighten the locknut, then recheck the clearance. Repeat the adjustment, if necessary.

    Specified Torque 

    14 N.m (1.4 kgf.m, 10 lbf.ft) 

    Apply new engine oil to the nut threads. 

  7. Rotate the crankshaft clockwise. Align the No. 3 piston TDC groove (A) on the camshaft sprocket with the top edge of the head.
    Fig 5: Aligning No. 3 Piston TDC Groove On Camshaft Sprocket With Top Edge Of Head
    G06949372Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Check and, if necessary, adjust the valve clearance on the No. 3 cylinder.
  9. Rotate the crankshaft clockwise. Align the No. 4 piston TDC groove (A) on the camshaft sprocket with the top edge of the head.
    Fig 6: Aligning No. 4 Piston TDC Groove On Camshaft Sprocket With Top Edge Of Head
    G06949373Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check and, if necessary, adjust the valve clearance on the No. 4 cylinder.
  11. Rotate the crankshaft clockwise. Align the No. 2 piston TDC groove (A) on the camshaft sprocket with the top edge of the head.
    Fig 7: Aligning No. 2 Piston TDC Groove On Camshaft Sprocket With Top Edge Of Head
    G06949374Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check and, if necessary, adjust the valve clearance on the No. 2 cylinder.
  13. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION  ).
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