What are the methods for detecting cylinder compression pressure?

[CadenLee]

Cylinder compression pressure can be detected using the following methods: 1. Using a cylinder pressure gauge. The detection steps are as follows: (1) Ensure the engine operates normally until the water temperature reaches above 75°C. (2) After stopping the engine, remove the air filter, use compressed air to clean the dust and dirt around the spark plugs or fuel injectors, then remove all spark plugs or fuel injectors and place them in order according to the cylinder sequence. (3) Insert the rubber adapter of the cylinder pressure gauge into the spark plug hole of the cylinder being tested, ensuring it is properly aligned and tightly secured. (4) Fully open the throttle and choke valves, and use the starter to rotate the crankshaft for 3-5 seconds (no less than four compression strokes). Stop rotating once the pressure gauge pointer indicates and maintains the maximum pressure. (5) Remove the cylinder pressure gauge, record the reading, and press the one-way valve to reset the pressure gauge pointer to zero. Measure each cylinder in sequence using the above method, with each cylinder measured no less than twice. 2. Using a cylinder pressure tester. (1) Detection with a pressure sensor-type cylinder pressure tester. (2) Detection with a starter current or starter voltage drop-type cylinder pressure tester. (3) Detection with an inductive discharge-type cylinder pressure tester.

[LaPiper]

As a seasoned veteran who frequently tinkers with engines, I'll tell you that measuring cylinder compression pressure requires professional tools. A cylinder compression gauge is essential—insert it into the spark plug hole to get a reading. First, shut off the fuel system and remove all spark plugs to ensure the engine can rotate freely, avoiding any spark or electrical leakage risks. After connecting the gauge, crank the engine a few times using the starter motor or manually turn the crankshaft to allow cylinder compression to move the needle. Normal readings should range between 120 and 200 psi, with no more than a 15% variation between cylinders. If pressure is low, perform a wet test: add a few drops of oil and retest—if the pressure rises, it may indicate worn piston rings. Uneven pressure often stems from valve leaks or a damaged head gasket. Always perform this test on a cold engine, wear protective gloves, and clean the spark plug holes afterward to prevent clogging. Regular checks help detect issues early, reducing major repair costs. With simple tools and some experience, engine health is fully under your control.

[MacDawson]

Hey car enthusiasts, this is a hot topic in our circles. I rely on a cylinder pressure gauge for diagnostics. First, pick a reliable compression tester from the tool shop, then remove the spark plugs and securely fit the gauge into the hole. Next, cut off the fuel supply and crank the engine a few times with the starter motor while watching the gauge for a stable reading. Around 140 psi is ideal for normal pressure – anything significantly lower could indicate cylinder wall wear or valve sealing issues. If there’s a big discrepancy, try a simple trick: add some oil and retest. If the pressure jumps up, the piston rings are likely the culprit. Don’t forget safety steps like disconnecting the battery’s negative terminal to prevent accidents. This method is quick, accurate, and beginner-friendly, saving you a trip to the repair shop. For routine maintenance, test every 10,000 km to avoid breakdown risks. A smooth-running engine keeps your mood just as smooth.

[DiAlexa]

As a beginner driver, I recently learned this method. The simplest way is to use a cylinder pressure gauge to measure the pressure in each cylinder. Remove the spark plugs, connect the gauge, then turn off the fuel supply and crank the engine with the starter motor a few times to record the readings. The normal range is above 130 psi. If a particular cylinder is significantly lower, add a bit of oil and test again; if the pressure increases, there might be an issue with the piston. Safety first—ensure the engine is cold and wear gloves before testing. Uneven pressure can easily cause shaking or high fuel consumption, and fixing it promptly can save you trouble and money. This test is easy to perform and doesn't require a professional background.