What are the symptoms of a damaged cylinder head gasket?

Burnt engine cylinder gaskets and air leaks in the compression system are common malfunctions. When the Ishikawa sealed cylinder gasket is burnt, it can severely deteriorate the engine's operating conditions, to the point where it may stop working, and may also cause damage to certain related components or parts. During the engine's compression and power stroke, it is essential to ensure that the upper space of the piston is sealed properly and no air leaks.
Based on the symptoms observed when the cylinder head gasket is burned and the compression system leaks, analyze and diagnose the causes of these fault indications, and suggest operational methods to prevent the occurrence of faults and effectively troubleshoot them.
1. Fault manifestations after the cylinder head gasket is damaged due to burnout The fault symptoms vary depending on the location of the burned area on the cylinder head gasket:
What are the symptoms of a damaged cylinder head gasket?
1. When there is blow-by between two adjacent cylinders without opening the pressure relief valve, shaking the crankshaft reveals insufficient pressure in both cylinders. When starting the engine, black smoke is emitted, and the engine speed drops significantly, indicating insufficient power.
2. When the cylinder gasket leaks, the compressed high-pressure gas enters the bolt holes of the cylinder head or leaks out from the joint surface between the cylinder head and the engine block. The leakage point shows the presence of light yellow foam. When the leakage is severe, it emits a "beep-beep" sound, sometimes accompanied by water leakage or oil leakage. During disassembly inspection, visible carbon deposits can be found on the corresponding cylinder head surface and nearby bolt holes of the cylinder head.
3. High-pressure gas in the gas engine oil passage leaks into the lubricating oil passage that is connected to the engine block and cylinder head gasket. During engine operation, the temperature of the oil in the oil pan remains high, the oil viscosity becomes thinner, the pressure decreases, and the oil deteriorates quickly. The oil sent to the upper part of the cylinder head to lubricate the valve train clearly contains bubbles.
4. When high-pressure gas enters the cooling water jacket and the engine cooling water temperature is below 50°C, opening the water tank cap reveals visible bubbles rising and escaping from the tank, accompanied by a large amount of hot air emanating from the tank opening. As the engine temperature gradually increases, the amount of hot air emitted from the tank opening also increases. In this situation, if the water tank overflow pipe is blocked and the tank is filled to the brim, the phenomenon of bubbles rising becomes more pronounced, and in severe cases, it may even appear as if it is boiling.
5. When the engine cylinder is in communication with the cooling water jacket or lubricating oil passage, yellowish-black engine oil foam may float on the upper surface of the cooling water in the radiator, or there may be obvious water in the engine oil in the oil pan. When these two types of blow-by phenomena are severe, water or engine oil may be present in the exhaust.