Valve seats — processing (BMW 7 Series E32)

The treatment of valve seats with traces of wear or carbon deposits can be performed on all engines if the correction angle and width of the contact surface are maintained. Otherwise, the cylinder head must be replaced. A special tool is required for the treatment of valve seats.





The valves are ground on a grinding machine at an angle of 45°. Valves with too small a height (H) must be replaced. Minimum edge thickness for petrol engines: exhaust valve - H=1.98 mm, intake valve - H=1.19 mm.

Note: When machining the valve seat, machine the surface at an angle of 45°, then machine the width of the contact surface by milling while maintaining the correction angle. After machining, grind the valves.

Dimensions after machining of valve seats