How to check the air leakage of engine cylinder?

About the landlord's concern about "how to check the air leakage of engine cylinder?" The following is my personal opinion:

Inspection method of air leakage in engine cylinder;

1, follow the feeling, everything is inseparable from the word feeling, and checking the working condition of the engine can also be judged by feeling. When the engine rotates, put your finger close to plug the spark plug hole and feel the impact of air pressure;

2. If cranking is labor-saving, and you can't feel the air impulse, it may be that the cylinder pressure is insufficient. If there is a sound, there is a feeling of air rushing to the hand, indicating that the cylinder gasket is burnt through and leaked;

3. Most intuitively, observation is the simplest and most intuitive detection method. When the engine is faulty, make full use of your observation to see if the cylinder and spark plug are faulty;

4. If there is too much carbon on the surface of the spark plug electrode and there is wet oil, that is, the piston ring is poorly sealed and leaks oil. When the spark plug is removed for inspection, there are water droplets on the electrode; When the motor drives the crankshaft to rotate, water or steam is ejected from the spark plug screw hole, which can be judged as burning through the cylinder water jacket. Million car purchase subsidy