Valve Clearance: Adjustments
AdjustmentNOTE: Adjust the valves only when the cylinder head temperature is less than 100°F (38°C).
1. Remove the cylinder head cover.
2. Set the No.1 piston at TDC. The punch mark (A) marked with an arrow 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.
3. Select the correct thickness feeler gauge for the valves you're going to check.
K20A3
Intake: 0.21 - 0.25 mm (0.008 - 0.010 inch)
Exhaust: 0.28 - 0.32 mm (0.011 - 0.013 inch)
K20A2 engine
Intake: 0.21 - 0.25 mm (0.008 - 0.010 inch)
Exhaust: 0.25 - 0.29 mm (0.010 - 0.011 inch)
4. Insert the feeler gauge (A) between the adjusting screw (B) and the end of the valve stem and slide it back and forth; you should feel a slight amount of drab.
5. 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.
6. Tighten the locknut and recheck the clearance. Repeat the adjustment if necessary.
7. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
8. Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
9. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
10. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
11. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
12. Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
13. Install the cylinder head cover.