Valve Clearance Adjustment

Special Tools Required 

Tappet adjust wrench set 07MAA-PR70100

1. Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL  ).
2. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the variable valve timing control (VTC) actuator and the punch mark (B) on the exhaust camshaft sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust camshaft sprocket.
   Fig 1: Aligning Punch Mark On VTC Actuator And Exhaust Camshaft Sprocket

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
3. Select the correct thickness feeler gauge for the valves you're going to check.

   Valve Clearance 

   Intake: 0.21-0.25 mm (0.008-0.010 in.) 

   Exhaust: 0.25-0.29 mm (0.010-0.011 in.) 

   Fig 2: Identifying Intake And Exhaust Valves

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. Insert the feeler gauge (A) between the adjusting screw (B) and the end of the valve stem, then 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

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. If you feel too much or too little drag, loosen the locknut with the tappet adjust wrench set, and turn the adjusting screw until the drag on the feeler gauge is correct.
   Fig 4: Identifing Adjusting Screw

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Tighten the locknut to the specified torque.

   Specified Torque 

   Intake: 20 N.m (2.0 kgf.m, 15 lbf.ft) 

   Apply new engine oil to the nut threads. 

   Exhaust: 14 N.m (1.4 kgf.m, 10 lbf.ft) 

   Apply new engine oil to the nut threads. 

7. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
   Fig 5: Identifying Crankshaft Position

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
9. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
   Fig 6: Identifying Crankshaft Position

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
11. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
    Fig 7: Identifying Crankshaft Position

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
13. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION  ).