| note | Perform the valve clearance check and adjustment at the engine cold state. |
1. Remove all ignition coils.
2. Remove the cylinder head cover.
| caution | Turn the crankshaft always clockwise. |
3. Turn the crankshaft clockwise, and align the timing mark on the camshaft sprocket against the upper face of the cylinder head as shown in Figure. Therefore, No.1 cylinder goes to the compression top dead center.
4. Using a thickness gauge, measure the valve clearance with the arrow shown in Figure. If deviated from the standard value, make note for the valve clearance.Standard value (cold engine)
- Intake side: 0.20 ± 0.03 mm (0.008 ± 0.001 inch)
- Exhaust side: 0.30 ± 0.03 mm (0.012 ± 0.001 inch)
5. Turn the crankshaft clockwise 360 degrees, and put the timing mark on the camshaft sprocket in position shown in Figure. Therefore, No.4 cylinder goes to the compression top dead center.
6. Check the valve clearance with the arrow shown in Figure. In the same procedure as 4.
7. If the valve clearance is deviated from the standard value, remove the camshaft and the valve tappet. For the camshaft removal, refer to Camshaft Removal and Installation 
. 8. Using a micrometer, measure the thickness of the removed valve tappet.
9. Calculate the thickness of the newly installed valve tappet through the following equation.A: Thickness of valve tappet to be selectedB: Thickness of removed valve tappet
C: Measured valve clearance
FormulaIntake side: A = B + [C - 0.20 mm (0.008 inch)]
Exhaust side: A = B + [C - 0.30 mm (0.012 inch)]
| note | The valve tappet ranges 3.000 - 3.690 mm (0.1181 - 0.1453 inch) and has 47 types per 0.015 mm (0.0006 inch) . The thickness below a decimal point is stamped on the reverse side of the valve tappet. |
10. Install the valve tappet selected through the procedure 9, and put the camshaft in position. For the camshaft installation, refer to Camshaft Removal and Installation . 11. After installing the timing chain, measure the valve clearance using the procedure 3 to 6. Confirm the clearance is within the standard value.
12. | caution | Follow the steps below to degrease the sealant application surface.- Before degreasing, make sure that the sealant application surface is free of dust, oil, or foreign materials.
- Wipe the sealant application surface with a dry paper towel.
- By using detergent for aluminum, degrease the sealant application surface by spray cleaning.
- Wipe detergent thoroughly with a dry paper towel. Do not touch the sealant application surface with your fingers, as the fingerprints adhering to the sealant surface affect the sealing.
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Remove the sealant from the cylinder head cover assembly and the matching area of the cylinder head assembly and the timing chain case assembly, and degrease the surface where the sealant is applied.
13. Apply specified sealant to the matching area of the cylinder head assembly and the timing chain case assembly as shown, and install the cylinder head cover assembly to the cylinder head assembly.Specified sealant: ThreeBond 1217G or equivalent
| note | Install the cylinder head cover assembly immediately after the application of sealant. |
14. Tighten the cylinder head cover assembly mounting bolts to the specified torque in the order of the numbers shown in the illustration.Tightening torque: 3.0 ± 1.0 N·m (27 ± 8 in-lb)
15. | caution | After the installation, until a sufficient period of time (one hour or more) elapses, do not apply the engine oil or water to the sealant application area or start the engine. |
Tighten again the cylinder head cover assembly mounting bolts to the specified torque in the order of number shown in the figure.
Tightening torque: 5.5 ± 0.5 N·m (49 ± 4 in-lb)
16. Install the ignition coils.
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