2. To make checking easier, remove all spark plugs.
3. Remove the cylinder head cover.
4. Turn the crankshaft clockwise until the mark on the pulley aligns with the "T" mark on the scale on the lower timing belt cover.
5. Use your hand to rock the valve rockers up and down for cylinders #1 and #4 to determine which cylinder has the piston at TDC on the compression stroke. If there are gaps between the valve rockers and the intake and exhaust valves of one of the cylinders, the piston of that cylinder is at TDC on the compression stroke.
6. Check and adjust the valve drive clearances shown in Fig. 3.8 with a white arrow when the piston of the 1st cylinder is at TDC in the compression stroke. If the piston of the 4th cylinder is at TDC in the compression stroke, the adjustment is performed on the rocker arms shown in Fig. 3.8 with a black arrow.
Fig. 3.8. When installing the piston of the 1st cylinder at TDC, measure the clearance of the valves marked with white arrows, and when installing the piston of the 4th cylinder at TDC, measure the clearance of the valves marked with black arrows
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7. Use a metal feeler gauge to measure the valve clearance.
If the clearance is not as specified, loosen the rocker arm adjusting bolt lock nut and adjust the clearance by turning the adjusting bolt and measuring the clearance with a metal feeler gauge.
Nominal clearance (hot engine):
- inlet valves: 0.20 mm
- exhaust valves: 0.30 mm
8. Using a screwdriver to hold the adjusting bolt from turning, tighten the lock nut to the required torque.
Tightening torque: 9 Nm
9. Turn the crankshaft 360° until the mark on the pulley coincides with the "T" mark on the scale of the lower timing belt cover.
10. Repeat the steps in points 7 and 8 and check and adjust the clearances in the drive of the remaining valves.
11. Install the cylinder head cover.
12. Screw in the spark plugs and tighten to the specified torque.
Tightening torque: 25 Nm