Valve Clearance: Adjustments
VALVE CLEARANCE INSPECTION AND ADJUSTMENTNOTE: Inspect and adjust the valve clearance when the engine is cold (Engine coolant temperature: 20°C) and cylinder head is installed on the cylinder block.
1. Remove the engine cover.
2. Remove oil filler cap.
3. Remove the center cover bolts and then remove the center cover.
4. Remove the upper timing belt cover
a. Loosen the upper timing belt cover bolts and then remove the cover.
5. Remove the cylinder head cover.
a. Disconnect the spark plug cables and do not pull on the spark plug cables by force.
NOTE: Pulling on or bending the cables may damage the conductor inside.
b. Disconnect the P.C.V. hose and the breather hose from the cylinder head cover.
c. Disconnect the accelerator cable from the cylinder head cover.
d. Loosen the cylinder head cover bolts and then remove the cover and gasket.
6. Set No.1 cylinder to TDC compression.
a. Turn the crankshaft pulley and align its groove with the timing mark "T" of the lower timing belt cover.
b. Check that the hole of the camshaft timing pulley is aligned with the timing mark of the bearing cap. If not. turn the crankshaft one revolution (360°)
7. Inspect the valve clearance.
a. Check only the valves indicated as shown. [No.1 cylinder: TDC/Compression] measure the valve clearance
- Using a thickness gauge, measure the clearance between the tappet shim and the base circle of camshaft.
- Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Engine coolant temperature: 20°C)
[Specification]
Intake:.............0.20 mm (0.0079 inch)
Exhaust:............0.28 mm (0.0110 inch)
[Limit]
Intake:...........0.12 - 0.28 mm (0.0047 - 0.0110 inch)
Exhaust:............0.20 - 0.36 mm (0.0079 - 0.0142 inch)
b. Turn the crankshaft pulley one revolution (360°) and align the groove with timing mark "T" of the lower timing belt cover. Check only the valves indicated as shown. [NO.4 cylinder: TDC/compression]. Measure the valve clearance. (See procedure in step (1 )]
8. Adjust the intake and exhaust valve clearance.
a. Turn the crankshaft so that the cam lobe of the camshaft on the adjusting valve is upward.
b. sing the special tool (09220 - 2D000), press down the valve lifter and place the stopper between the camshaft and valve lifter and remove the special tool.
c. Remove the adjusting shim with a small screw driver and magnet.
d. Measure the thickness of the removed shim using a micrometer.
e. Calculate the thickness of a new shim so that the valve clearance comes within the specified value.
Valve clearance (Engine coolant temperature: 20°C)
T:.......Thickness of removed shim
A:.......Measured valve clearance
N:.......Thickness of new shim
Intake:..............N = T + [A - 0.20 mm (0.0079 inch)]
Exhaust:..............N = T + [A - 0.28 mm (0.0110 inch)]
f. Select a new shim with a thickness as close as possible to the calculated value. [Refer to the Adjusting shim selection chart]
NOTE: Shims are available in 20 size increments of 0.04 mm (0.0016 inch) from 2.00 mm (0.079 inch) to 2.76 mm (0.1087 inch)
g. Place a new adjusting shim on the valve lifter.
h. Using the special tool (09220 - 2D000), press down the valve lifter and remove the stopper.
i. Recheck the valve clearance.
Valve clearance (Engine coolant temperature: 20°C)
[Specification]
Intake:..............0.20 mm (0.0079 inch)
Exhaust:..............0.28 mm (0.0110 inch)
[Limit] (After adjusting valve clearance)
Intake:..............0.17 - 0.23 mm (0.0067 - 0.0091 inch)
Exhaust:..............0.25 - 0.31 mm (0.0098 - 0.0122 inch)
Adjusting Shim Selection Chart (Intake):
Adjusting Shim Selection Chart (Exhaust):
3. Install the cylinder head cover.
4. Connect the accelerator cable.
5. Connect the PCV hose and the breather hose to the cylinder head cover.
6. Connect the spark plug cables to the spark plugs.
7. Install the upper timing belt cover with the four bolts.
Cylinder head cover: 8 - 10 Nm (80 - 100 kg.cm, 6 - 7 ft. lbs.)
8. Install the center cover with the five bolts.
Center cover: ..................2.5 - 3.5 Nm (25 - 35 kg.cm, 2 - 3 ft. lbs.)
9. Install the oil filler cap.
10. Install the engine cover.