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A very common factor in the appearance of engine knocking is the use of a thinner cylinder head gasket, which causes an increase in the compression ratio.When the engine is cold, the appearance of detonation shocks, and hence the characteristic knock results in the use of fuel with lower octane (according to the manufacturer’s recommendations).
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The main reason is the untimely and uneven ignition of the fuel-air mixture, which provokes spontaneous destructive explosions inside the cylinders. Its intensity naturally increases with each engine cycle. The knock caused by the detonation is quite loud.Similar knocking can cause the deformation of the piston rings. Damaged pistons move freely, as if “walking” in the cylinders, causing a characteristic metallic sound when the “skirt” hits. If the piston is sufficiently worn, it can also make a tapping sound during operation.When the engine is subsequently warmed up, these knocks become either less intense or completely disappear. The most common reason is an increase in camshaft clearances. The characteristic sound in the engine also indicates that there are problems with the gas distribution mechanism.
ENGINE KNOCK PROFESSIONAL
Here you need the urgent help of a professional car mechanic, as the operation of the car in this condition is strictly prohibited. This sound is characteristic of a worn connecting rod hitting the crankshaft neck.
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As a result, they begin to emit an unpleasant rattle and rasp. In this case, the amount of incoming oil becomes insufficient, and at the same time, there is a blockage of the channels, which leads to the fact that the oil does not have time to produce high-quality lubrication of all components and parts. Incorrect operation of the bearings can also be caused by a decrease in the performance of the oil pump. It is self-canceling when the pressure indicator of the lubrication system increases. Increasing the gap between the main bearings may cause knocking in the first few seconds after starting the engine.To eliminate this problem, it is enough to perform a complete engine wash, replace the engine oil with a required one, and oil filter as well. Compensators fail, due to mechanical wear, the use of oil that is unsuitable for the car according to the required specifications, as well as its untimely replacement. The loss of performance of hydraulic compensators also causes the engine to knock when cold.You can correct this situation by adjusting the valves professionally. Metal knocking in the engine provided that the internal combustion engine is fully serviceable, signals that the accepted norms of thermal gaps do not meet.So the main factors that can cause engine knocks are The knock that occurs when starting a cold internal combustion engine, followed by its warming up, can completely disappear, can become less intense, does not change its character during further operation of the engine, or might have higher intensity because of the increasing pressure and/or temperature. This factor becomes fundamental for a good diagnosis. The nature of the sound depends largely on the cause of its appearance, that is, the failure of a part, or the degree of detonation. The main ones are because of mechanical wear of parts and assemblies, as well as the formation of detonation processes. There are quite a lot of reasons for the occurrence of knocks in the engine. If you continue to drive like this the engine may stall.