What is a car valve oil seal
Valve oil seals are a type of oil seal, generally made by vulcanizing an outer skeleton and fluororubber together. Self-tightening springs or steel wires are installed at the orifice of the oil seal to seal the engine valve guide rods.
It can prevent engine oil from entering the intake and exhaust pipes, avoid oil loss, prevent the mixture of gasoline and air as well as the leakage of exhaust gas, and prevent engine oil from entering the combustion chamber. Because it comes into contact with gasoline and engine oil at high temperatures, materials with excellent heat resistance and oil resistance are usually fluororubber.
A damaged valve oil seal can cause many problems. For instance, engine oil can enter the cylinder along the valve guide rod, causing carbon deposits on the spark plugs, deteriorating operating conditions, or even failure to work, reducing engine power. Valve tilting can lead to poor cylinder sealing, decreased cylinder pressure, weakened engine power, and accelerated oil consumption. During long-distance driving, the engine may be damaged due to a lack of oil.
If a car has difficulty accelerating or emits blue smoke, it might be that the valve oil seal has aged. There are many reasons for aging. Foreign objects mixed in during installation, dust, poor assembly, incorrect installation direction, uneven coating processing, etc. may all lead to leakage. Excessive pressure in the selection process can cause gap biting and air to mix in, leading to adiabatic compression and seal burning. High-frequency reciprocating motion can cause the seal to heat up, and dry grinding and environmental dust can cause abnormal wear of the sealing ring and rust in the sealing groove, which will also have an impact. Improper selection of materials for guiding support components in design, inappropriate clearance of friction pairs, improper thread guide angles at the ends of the cylinder barrel, piston and cylinder, improper guide angles for sealing installation, inappropriate roughness of the sliding surface, uneven electroplating, and insufficient roughness of the sealing groove can all damage the sealing ring. In addition, problems with the product itself or improper sealing and storage, as well as the deterioration and degradation of the sealing material due to high temperatures during transportation, can also lead to aging.
The installation and replacement of valve oil seals involve certain steps. When disassembling, first remove the camshaft and hydraulic tanner. Use a spark plug wrench to remove the spark plugs. Adjust the piston of the corresponding cylinder to the top dead center. Use bolts to install the spring compression tool on the cylinder head. Connect the air compressor. Use a threaded mandrod and thrust piece to press down the valve spring. Remove the spring. Gently tap the valve spring seat. Remove the valve lock block. Use a tool to pull out the valve stem oil seal. When installing, the plastic sleeve should be attached to the valve stem to prevent damage to the new oil seal. Lightly apply a layer of engine oil to the lip of the oil seal. Install the oil seal onto the tool and slowly push it onto the valve guide. Before installing the intake and exhaust valves, apply a layer of engine oil to the valve stem.
In conclusion, although the valve oil seal is small, its function is crucial. Once a problem occurs, it should be dealt with promptly.
The components of the valve assembly include valves, valve springs, valve lock clamps, valve guides, valve seat rings, valve stem seals, valve seats, etc.
Valves are key components that control intake and exhaust, and they are divided into three parts: valve heads, valve seats, and valve stems. When designing the valve head to bear the force generated by the combustion pressure, the height of the valve face is taken into consideration. The valve stem is used to guide inside the valve guide. To avoid wear, a chrome-plated surface is often adopted.
The valve spring is responsible for closing the valve in a controllable manner to prevent vibration after the valve jumps. Its standard structural form is a symmetrical cylindrical spring.
The valve guide is used to ensure that the valve is at the center of the valve seat and to transfer heat to the cylinder head through the valve stem. When installing, the optimal clearance should be left.
The valve lock clamp is responsible for connecting the valve spring seat and the valve. It is divided into clamping type and non-clamping type. The clamping type is especially suitable for engines with very high rotational speeds.
The valve seat serves to separate the combustion chamber from the gas passage. Heat is also transferred from the valve to the cylinder head through this area. Its surface width is usually 1.2 to 2.0mm. The Angle will affect the sealing effect and wear condition.
The head diameter of the intake valve is 15% to 30% larger than that of the exhaust valve to increase the intake volume. Modern high-performance automotive engines generally adopt three, four or five valves per cylinder. Among them, four-valve engines are widely used, which can increase the intake air volume, torque and power, reduce the inertial force of valve movement, and mostly adopt a marque-shaped combustion chamber, which is conducive to the combustion process.
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