Procedure
Caution! Check and adjust valve clearances on a cold engine (coolant temperature 21°C) and the cylinder head installed on the cylinder block.
1. Remove the engine cover.
2. Remove the cap from the oil filler neck.
3. Remove the screws and remove the center cover.
4. Remove the upper timing belt cover.
- Loosen the bolts securing the upper timing belt cover and remove it.
5. Remove the cylinder head cover.
- Disconnect the high-voltage wires without applying significant force to them.
- Disconnect the crankcase ventilation hose from the cylinder head.
- Disconnect the accelerator cable from the cylinder head.
- Remove the cylinder head cover mounting bolts and remove the cover and gasket.
Caution! Applying significant force or bending high-voltage wires may damage the central core of the wire.
6. Set the piston in the first cylinder to the top dead center in the compression stroke.
- Turn the crankshaft clockwise and align the groove on the pulley with the "T" mark on the lower timing belt cover.
- Check that the hole on the camshaft pulley is aligned with the mark on the bearing cap, otherwise, rotate the crankshaft one revolution (360°).
7. Check valve clearances.
- a. Check only the valve clearances shown in the illustration (the piston in the first cylinder is set at TDC in the compression stroke).
- Using a feeler gauge, measure the clearance between the tappet adjusting shim and the base of the camshaft lobe.
- Record the measured gap value. This value will be needed to calculate the required thickness of the adjusting shim.
Valve clearance (coolant temperature 20°C):
- inlet valves: 0.20 mm;
- exhaust valves: 0.28 mm.
Valve clearance (coolant temperature 80°C):
- inlet valves: 0.29 mm;
- exhaust valves: 0.34 mm.
Maximum permissible valve clearance:
- inlet valves: 0.12–0.28 mm;
- exhaust valves: 0.20–0.36 mm.
- b. Turn the crankshaft one revolution (360°) clockwise and align the groove on the pulley with the "T" mark on the lower timing belt cover.
- c. Check only the valve clearances shown in the illustration (the piston in the first cylinder is set at TDC in the compression stroke).
- Using a feeler gauge, measure the clearance between the tappet adjusting shim and the base of the camshaft lobe.
- Record the measured gap value. This value will be needed to calculate the required thickness of the adjusting shim.
8. Adjust the clearances of the intake and exhaust valves.
- a. Turn the crankshaft so that the camshaft lobe contour on the valve being adjusted faces upward.
- b. With a special tool (09220 - 2D000) press the valve tappet, insert the stopper between the camshaft and the tappet and remove the special tool.
- c. Use a small screwdriver or magnet to remove the adjusting shim.
- d. Use a micrometer to measure the thickness of the removed adjusting shim.
- e. Calculate the thickness of the new adjusting shim so that the valve clearance is within the specified value.
Valve clearance (coolant temperature 20°C)
- T: Thickness of the removed adjusting shim
- A: Measured valve clearance
- N: Thickness of the new adjusting shim
Inlet valves: N = T (A – 0.20 mm)
Exhaust valves: N = T (A – 0.28 mm)
- f. Select a new shim with a thickness closest to the calculated value.
Attention! Adjusting shims of 20 sizes with thickness from 2.00 mm to 2.76 mm with a step of 0.04 mm are supplied as spare parts.
- g. Install a new adjusting shim onto the valve lifter.
- h. Special tool (09220 - 2D000) press the valve tappet and remove the stopper.
- i. Recheck the valve clearance.
Valve clearance (coolant temperature 20°C):
- inlet valves: 0.20 mm;
- exhaust valves: 0.28 mm.
Maximum permissible valve clearance:
- inlet valves: 0.17–0.23 mm;
- exhaust valves: 0.25–0.31 mm.