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How to Measure Engine Cylinder Pressure?

1 Answers

VanDylan

07/29/25 4:46pm

Cylinder pressure measurement steps are as follows: 1. First, use compressed air to clean the dirt around the spark plugs. 2. Remove all spark plugs. For gasoline engines, also disconnect the secondary high-voltage wires of the ignition system and securely ground them to prevent electric shock or fire. 3. Insert the conical rubber tip of the dedicated cylinder pressure gauge into the spark plug hole of the cylinder being measured, align and press it firmly. 4. Fully open the throttle (and the choke if equipped), and use the starter to rotate the crankshaft for 3-5 seconds (no less than 4 compression strokes). Stop rotating once the pressure gauge needle indicates and maintains the maximum pressure reading. 5. Remove the pressure gauge, record the reading, and press the one-way valve to reset the gauge pointer to zero. Measure each cylinder in this manner, performing at least 2 measurements per cylinder. Take the arithmetic average of the results for each cylinder, compare them with the standard values, analyze the results, and determine the working condition of the cylinders.

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