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Heat the cylinder head gradually and evenly to 200 °C and chill the valve seats in dry ice.
Drive the seats keeping perfectly square in their housing using the suitable drift.
Leave them cool down and grind them, the union of the ducts with the new seats and lap the valves.
Coupling valve seat and valve
Use Prussian blue or a mixture of minium and oil to check that the contact surface (A) between valve and
seat is 1.0÷1.5 mm.
Maximum allowed limit: 2.0 mm.
Grind the seat if the dimension measured is greater than the above limit.
Fill the fuel intake and discharge ducts to check for any leakage; in case of leakage, check that there are no
burrs on the concerned seal surface.
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