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ENGINE AUTO PARTS: EXHAUST VALVE
In order to operate a piston engine and the valves, as well as opening and closing during the gas exchange, the air inlet and exhaust gas outlet, a mechanism called valve gear or valve actuator starts. One of the valves is called exhaust valve. It opens the channels for the release of the burnt gases after the expansion stroke. To withstand the high temperatures and corrosion caused by exhaust gases, for optimum heat transfer the exhaust valve usually is hollow and filled with liquid sodium. Heat goes into the handle with the help of sodium and vibration.Almost all 4-stroke engines have a piston engine. Not valves but pistons, rotating spools, or membranes are mainly used in two-stroke engines and exclusively in rotary-piston engines for gas distribution. The exception are 2-stroke diesel engines, which have the exhaust valve with control. The valves are opened by cranked shafts that are operated by camshafts. They are closed with pneumatics, mechanics, or coil springs. Engines vary by camshafts and valves location. For example, IOE (Inlet Over Exhaust ) engines use only outlet valves . Other use SV(Side Valves) engines. In the OHV (Over Head Valves) engines the valves are hanging in the cylinder head. The most popular is OHC (Over Head Camshaft) engine. In this case, the camshafts are located above the surface of the connector and the combustion chamber between the cylinder block and the head.If you need exhaust valve for a particular car brand, for example, Ford, you can easily find it in our range of spare car parts by the car maker’s number listed in the documents for the car. Also in our Internet store you will find inlet valves, valve nozzles and expansion valves.
HOW TO DETECT MALFUNCTION OF THE EXHAUST VALVE
First, the valve is to be visually inspected, and its condition evaluated. Check whether the component is located correctly, and whether the valve face size is sufficient. Ideally, the width of the latter should be 1.15-1.5 mm. After that, measure the clearance between the component and the piston. To do so, pull out the piston as much as possible. The optimum clearance is 2.5 mm. If the measurement result is less than this value, the valve may hit the piston, which will immediately destroy the valve.
Besides, it is necessary to check how much the component is fouled. If the component has considerable carbon deposit, or combustion residues and oil decomposition products, the component is to be cleaned. For cleaning, use compositions that contain alcohol.
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