2. Check the cylinder head/engine block for deflection in length and width using a ruler and a set of templates. The deflection along the entire length should not exceed 0.08 mm. There should be no deflection across the entire width.
3. Check the flatness of the cylinder head also on the upper sealing surface to the cylinder head cover. The permissible deviation should not exceed 0.1 mm.
Caution! If light scratches are found on the partition between the inlet and outlet valves, there is no need to replace the cylinder head. If the surface of the cylinder head, especially the surface separating the combustion chambers, is uneven, deformed or has light damage such as scratches, lines, etc., then sand the damaged surfaces. This does not apply to the sealing surface of the cylinder head cover.
4. 2.0L engine: overall cylinder head height H = 142.9–143.1 mm.
After grinding, the height of the cylinder head must be at least H = 142.2 mm.
The height of the microroughness of the sealing surface should not be more than 0.004 mm. If the distance from the end of the valve stem to the surface of the camshaft bearing is H1 = 20.4–21.4 mm, this valve can continue to be used. If H1 = 21.4–21.97 mm, a new valve 106.4 mm long should be installed. If H1 = 19.5–20.3 mm, a repaired valve 105.5 mm long can be installed.
After possible grinding of the engine block surface, pay attention to the maximum piston protrusion, which should be 0.74–0.96 mm. With a protrusion of 0.96–1.16 mm, install a thicker cylinder head gasket (1.85 mm).
In the ground cylinder head, before its installation, the valve lag (a) and the protrusion of the pre-chamber should be checked. Protrusion of the pre-chamber: 7.6–8.1 mm.
5. Check the engine valve timing.
6. Install the cylinder head.