How to Use a Cylinder Pressure Gauge?
2 Answers
Cylinder pressure gauge usage method: Start the engine and stop when the water temperature reaches about 80 degrees; use compressed air to blow off the dust around the spark plugs, then open the throttle and choke. Place the cylinder pressure gauge on the spark plug hole of the first cylinder, quickly rotate the crankshaft using the starter or hand crank at a speed of about 180 revolutions per minute, and record the pressure gauge reading. Repeat the test 2 to 3 times. A cylinder pressure gauge is a specialized gas pressure gauge, typically composed of a pressure gauge head, hose, one-way valve, and connector. The pressure gauge head is mostly of the Bourdon tube type, with its driving element being a flat tube bent into a circular shape, with one end fixed and the other end movable.
When it comes to using a cylinder pressure gauge, I think it's quite important. As someone who frequently repairs cars, I've encountered many cases where this tool is primarily used to measure the pressure in each cylinder of the engine to check if the sealing is normal. The method is to first prepare the pressure gauge and a wrench, ensuring the engine is cold to avoid burning your hands. Then, remove all the spark plugs and screw the pressure gauge into the first cylinder's spark plug hole. Have an assistant help by pressing the accelerator while you read the pressure value on the gauge. Generally, the pressure should be between 10 to 15 bar to be considered normal. Repeat this process for each cylinder and compare the numbers. If a cylinder shows lower pressure, it's likely due to worn piston rings or leaking valves. I particularly emphasize not to touch anything carelessly while the ignition is on, as it can easily cause an electric shock. Also, remember to check the sealing rings before reinstalling the spark plugs after testing, as aging can sometimes affect accuracy. With a few more tries, you'll get familiar with it. Keep a small note after each test to help diagnose issues like high fuel consumption or insufficient power. In short, using this tool regularly for preventive maintenance can really save a lot of money.
