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发动机汽缸的密封包括气门、活塞环以及汽缸盖与汽缸体之间的密封等。诊断检查方法有以下多种。(1)气压表检查法诊断时对于能够启动运转的发动机,使之达到80～90℃的正常温度,各部机件配合间隙达到正常的工作状态,然后停机拆下各缸火花塞,以减少曲轴转动时的阻力,并将化油器阻风门和节气门调到全开,各缸依次用气压表头紧压在火花塞孔中再启动时,气压表指示读数即为检测结果。
Engine cylinder seals include valves, piston rings, and seals between the cylinder head and cylinder block. There are many ways to check the diagnosis. (1) When diagnosing the barometer test, the engine that can start running should be brought to the normal temperature of 80-90 ℃. The parts of the parts should reach the normal working condition with the clearance, then stop to remove the spark plugs of each cylinder to reduce the crankshaft rotation When the resistance and carburetor choke and throttle transferred to fully open, each cylinder followed by the pressure gauge pressed into the spark plug hole and then start the barometer reading indicates the test result.