VALVE CLEARANCE ADJUSTMENT
Measure valve clearance as described in the following procedure.
Check and adjust the valve clearance with the timing chain installed.
caution | Always rotate the crankshaft clockwise. |
1. Rotate the crankshaft clockwise to align the timing mark of the V.V.T. sprocket with the top surface of the cylinder head as illustrated. (Set the Number 1 piston at top dead center on the compression stroke.)
2. Valve clearance can be measured at the illustrated location in this condition.
3. Use a thickness gauge to measure clearance between the camshaft and valve tappet.Standard value (when engine is cold):
- Intake side: 0.20 ± 0.03 mm (0.008 ± 0.001 inch)
- Exhaust side: 0.30 ± 0.03 mm (0.012 ± 0.001 inch)
4. If measured values are out of the standard value, record measured values.
5. Rotate the crankshaft by one turn clockwise to set the Number 4 piston at top dead center on the compression stroke.note | The timing mark of the V.V.T. exhaust sprocket must be at the illustrated position. |
6. Valve clearance can be measured at the illustrated location in this condition.
7. If measured values are out of the standard value, record measured values.
8. If the measured value is out of the standard value, replace the valve tappet.note | There are 47 kinds of valve tappets at intervals of 0.015 mm (0.0006 inch) in the range between 3.000 (0.1181 inch) and 3.690 mm (0.1453 inch). |
9. Use the following procedure select a valve tappet.(1) Measure thickness of a removed valve tappet.
(2) Calculate thickness of a valve tappet so that valve clearance meets the standard value.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])
Refer to "Removal and installation of camshaft" for removal, installation and inspection procedure of valve tappets.