How to Measure Cylinder Pressure with a Pressure Gauge?

1 Answers
DeLandon
07/30/25 10:55am
Method for measuring cylinder pressure with a pressure gauge: 1. Start the engine and run it until the coolant temperature reaches approximately 80 degrees Celsius, then stop; 2. Use compressed air to clean the dust around the spark plugs, remove the spark plugs from each cylinder, and open the throttle and choke valves; 3. Remove exhaust gases from the cylinder, place the rubber tip of the cylinder pressure gauge over the spark plug hole, and press firmly; 4. Quickly turn the crankshaft using the starter or hand crank, record the pressure gauge reading, repeat the test 2 to 3 times, then measure the remaining cylinders in sequence; 5. If the cylinder pressure is below the standard, add 20 to 30 grams of fresh engine oil to the top of the piston and retest the pressure. If the pressure increases significantly, it indicates piston ring wear. If the pressure remains unchanged, it suggests valve or cylinder head gasket leakage.
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