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Valve Clearance: Testing and Inspection



INSPECTION

NOTE: Inspection and adjustment of valve clearance should be performed while engine is cold.

1. Set the vehicle on a lift.
2. Lift-up the vehicle.
3. Remove the under cover.
4. Lower the vehicle.





5. Disconnect the ground cable from battery.





6. Remove the timing belt cover (LH).
7. When inspecting #1 and #3 cylinders:
1 Disconnect the spark plug cords from spark plugs RH side.
2 Disconnect the PCV hose from rocker cover (RH).
3 Remove the bolts, then remove the rocker cover (RH).
8. When inspecting #2 and #4 cylinders:
1 Disconnect the spark plug cords from spark plugs (LH Side).
2 Disconnect the PCV hose from rocker cover (LH).
3 Remove the bolts, then remove the rocker cover (LH).
9. Set #1 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the socket wrench.





NOTE: When the arrow mark (A) on cam sprocket (LH) comes exactly to the top, #1 cylinder piston is brought to the top dead center of compression stroke.





10. Measure #1 cylinder valve clearance using thickness gauge.

CAUTION:
^ Insert the thickness gauge (A) in as horizontally as possible with respect to the valve stem end face.
^ Measure the exhaust valve clearances while lifting-up the vehicle.

11. If necessary, adjust the valve clearance.
12. Measure the valve clearance in #3, #2 and #4 cylinder in the same measurement procedure as #1 cylinder.

NOTE:
^ Be sure to set the cylinder pistons to their respective top dead centers on compression stroke before measuring valve clearances.
^ By rotating the crank pulley clockwise every 180° from the state that #1 cylinder piston is on the top dead center of compression stroke, #3, #2 and #4 cylinder pistons come to the top dead center of compression stroke in this order.

13. After inspection, install the related parts in the reverse order of removal.