What is the method for inspecting a cylinder?
2 Answers
The method for inspecting a cylinder is: 1. Measure the cylinder pressure by starting the engine and running it until it reaches normal operating temperature, then remove the air filter; 2. Clean the dirt around the spark plug, remove the spark plug, and ensure the throttle is fully open; 3. Insert the tapered rubber tip of a specialized cylinder pressure gauge into the spark plug hole of the cylinder being measured; 4. Measure the cylinder leakage by placing the intake and exhaust valves of the cylinder being tested at the top dead center position of the compression stroke while the engine is stationary, then use a cylinder leakage tester to check if the pressure reaches the specified value; 5. Throttle comparison method: when the engine is running, increase the throttle, and if a continuous knocking sound is heard from the crankcase, it indicates that the cylinder wall is scratched, causing gas to leak into the crankcase during compression and combustion.
When my old car showed signs of power loss, my first suspicion was cylinder issues. Using a DIY compression tester, I checked each cylinder's pressure by connecting the gauge to the spark plug hole and cranking the engine. Normal readings should be around 120-150 psi; if the pressure is low or varies by more than 15%, it indicates air leaks or wear. I also watch for blue smoke from the exhaust or rapid oil consumption, which are signs of oil burning. Listening for abnormal engine noises and vibrations is crucial, as damaged piston rings often cause metallic knocking sounds. If problems are found, replacing piston rings or valve seals promptly can prevent engine failure. For routine maintenance, I make it a habit to check spark plug residue and the air filter, as these signs can provide early warnings about cylinder health and reduce major repair costs. Regularly changing the oil and avoiding frequent short trips are also key to extending engine life.
