This allows the air and fuel charge to enter the combustion chamber and after ignition the exhaust valve allows the waste gases to flow out into the exhaust system.
Car engine valve. If the timing belt snaps or jumps then the powerful piston may touch the valve and this will cause a bent valve. The valves used in car engines are termed as poppet or mushroom valves. The one through which the spent gases escape is the exhaust valve. The operation is controlled by pear shaped lobes called cams on a rotating shaft the camshaft driven by a chain a belt or a set of gears from.
If the movement at the valve head is more than 0007 in. There are two types of ohc valve gear direct acting and indirect acting. How the valves work. 02 mm the valve guide or the valve stem may be excessively worn check the manufacturers specifications given in a service manual or consult your local dealer.
The angular face is ground on the valve head to make an angle of 450 or 300 to match the angle of the valve seat in the cylinder head. Check valve guides for wear by first refitting a valve into its respective guide then raising the valve slightly off its seat. Try moving the valve head from side to side. The head of the valve has an accurately ground face with enough margin left to avoid a thin edge.
The car handbook should tell you the clearances if not consult a dealer or the car service manual. The engine cant inhale and exhale unless the valve opens and closes at the right time. The main function of an engine valve is to open and close rapidly. The valve gear fitted to your engine will be either pushrod ohv or overhead camshaft ohc see the engine how the valves open and close.
The valves are in a constant dance with the pistons kept in sync via the timing belt or chain.
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