How to Locate the Top Dead Center of the First Cylinder in an Engine?

[FelixFitz]

To locate the top dead center (TDC) of the first cylinder in an engine, the following methods can be used: 1. Static Measurement Method: Using the static TDC mark on the engine flywheel as a reference, rotate the engine manually (focusing on the first cylinder for multi-cylinder engines) until the piston reaches the top of the cylinder and then begins to descend. Carefully determine the highest point of the piston using a dial indicator or midpoint travel method, which indicates the TDC. 2. Dynamic Measurement Method: This method typically employs a capacitive displacement sensor to directly measure the dynamic TDC. When the piston top reaches TDC, the capacitance between the sensor's fixed plate and the piston (acting as the moving plate) will be at its maximum. Thus, the TDC signal can be obtained using a capacitance measurement device. 3. Compression Line Method: This method involves recording the cylinder pressure curve without fuel supply to determine TDC. The sensor used in the compression line method is magnetoelectric, featuring a simple structure, easy installation, and durability. It can also be used for real-time engine speed measurement.