1
What is?
The spark plug (spark plugs), its role is the high voltage discharge wire high-voltage pulses fed, an air breakdown between the electrodes of the spark plug, mixed spark ignition within the cylinder in order to produce gas.
2
Common types which
according to the heating value of the high and low points, a cold type and thermal type; according to points electrode material, nickel alloy, silver alloy, platinum alloy and the like; if more professional look, the spark plug of the type generally are the following:
1, the quasi-type spark plug: which insulator skirt Abbreviations into the housing end face side electrode outside the housing end faces, is one of the most widely used.
2, spark plug projecting rim body: an insulator long skirt, projecting outside the housing end. It has an endothermic large, good dirt capacity, etc., and can be directly cooled by the intake air temperature is lowered, and thus is less likely to cause ignition hot, so hot adapt to a wide range.
3-electrode type spark plug: its very fine electrode, characterized by a strong spark ignition capability is good, in the cold season to ensure that the engine can be started quickly and reliably, a wide range of heat, to meet a variety of uses.
4, Block type spark plug: its housing and screwed into threads are tapered, and therefore the gasket can not maintain a good seal, thereby reducing the volume of the spark plug, the engine is more advantageous.
5, polarity type spark plug: two-side electrode is generally two or more, the advantage of reliable ignition, do not require frequent adjustment of the gap, it is easy on the ablation electrode and the spark plug gap adjustment can not always some gasoline often used.
6, surface flashover type spark plug: i.e., alongGap surface, which is the most cold type spark plug, the gap between the housing and the end face of the center electrode are concentric.
In addition, in order to suppress radio interference automotive ignition system, but also the production of the shielded resistor type and a spark plug. Resistive ceramic resistor spark plug is a spark plug built in 5-10Ω, the spark plug is shielded with a metal housing shielding the entire spark plug is sealed. Shielded spark plug can not only prevent radio interference, it may also be used for waterproofing, explosion-proof case.
3
To check and maintain
Health Check
a spark plug condition other than the sealing Combustion Test with special equipment, check the following method can be taken.
On-vehicle test method
1 Touch Method: starting the engine, so that idling touch plug insulating ceramic parts, such as very high temperature rises rapidly, shows that the spark plug normal, otherwise abnormal.
2. Short-circuit method: starting the engine, so that it idle, then the spark plug with a screwdriver on the cylinder by a short circuit, and listen to the sound of the engine speed changes, changes in sound speed and clear, indicating that the spark plug normal, otherwise abnormal.
3, flashover method: Unscrew the spark plug on the cylinder block, with a high-voltage test fire, without spark or weak spark, the spark plug show leakage or inoperative.
View colorimetric method
Remove the spark plug was observed, such as russet color or rust, showed normal spark plug; stains such as oil, spark plug gap indicate disorders or excessive supply, high-voltage short or open; to smoke, such as the black, indicating that the wrong type spark plug or mixed hot and cold gas concentration, channeling oil; as sediments between the electrode tip, when the oily deposit, regardless of the oil cylinder channeling described spark plug, when the black deposit is described bypassing spark plug fouling, when a gray deposit, is covering the electrode lead additives in gasoline misfire; if severe erosion, such as from the top scar, black burst pattern, melting of the electrode, the spark plug showed damage.
access points
in the usual repair process, to be noted that the spark plug operating conditions, such as when the following conditions occur, should be repaired or replaced.
When carbon black is attached, when the thin metal wire, etc. scrape deposits, if easily scraped off, then the deposit of soot generated during combustion of the gas mixture, after cleaning and therefore, the performance of the spark plug it will be restored. Moreover, for reasons to be adhered blackened char is too thick or oil mixture in the cylinder sneaked sake. Therefore, to deal with these cases to be checked. If there is no reason for generating the abnormal condition, the spark plug but still blackened phenomenon, then this is due to the conditions of use of the vehicle and a spark plug produced by improper heat value. It should be replaced immediately suitable heating value for the spark plug.
was black and wet state. Moisture probably occurs because: due to the high frequency choke, resulting in excessive inhaled gas mixture too thick; air cleaner element due to clogging of the suction air mixture too thick; heat value of the spark plug or the like due to excessive . Ruoyin excessive inhalation gas mixture too thick, the spark plug was dried, its performance can be restored.
an insulator or partially baked white burnt together with the electrode, because the electrode sites overheating generated. The reason is because the cooling system is not normal, the mixture is too lean caused. While if there is no such unusual but still overheating, it is due to improper driving conditions and spark plug heat value caused by the spark plug should be replaced immediately as a high calorific value. When
with a gap between the center electrode and the ground electrode of the spark plug feeler gauge examination, deviates from a predetermined value, it should be adjusted.
The spark plug leakage mostly due to poor sealing due to the insulator housing. When the leakage between the housing and the insulator, usually black stripes along the outer surface of the insulator leakage direction, not only affects the leak tightness of the spark plug of the cylinder, also easily lead to overheating of the spark plug, but also produce coke along the leak site, reduce the insulation performance of the insulator. When the spark plug leak, should be replaced.