- their seats are not so worn that the valve disc, inserted into the cylinder head, is located more than 1.5 mm below the surface of the cylinder head. To measure, place a metal ruler transversely on the cylinder head and measure the distance;
- the cleaned head has no cracks, burnt areas or impact marks (in most cases they can only be seen after sanding);
- the intake valves still have the required flange thickness of at least 0.5 mm (see picture).
The figure shows the important dimensions for additional valve grinding: the flange thickness b at the inlet valve must be at least 0.5 mm. It is not measured at the inlet valve. The annular sealing surface after grinding must have a width of a. For the inlet valve, a is 2.0 mm, for the outlet valve - 2.4 mm.
First, you need to check the radial clearance of the valve in the valve guide. The valves should not move more than 1.3 mm, otherwise you need to replace the valve guides.
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