Measure the valves, replace any valves that do not match the specified dimensions.
The most important parameters of the valve plate:
a = max 3.5 mm;
b = min. 0.5 mm,
α= 45°.
If the ends of the valve stems are worn, they can be processed on a grinding machine, provided that no more than 50% of the material is removed.
The inlet valve discs can be machined on a valve grinding machine, provided that the dimension (b) is at least 0.5 mm. This is not permissible for the exhaust valves, as they are made of a special material. The exhaust valves can only be made usable again by grinding with paste or they must be replaced. Under no circumstances should these valves be simply thrown away.
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