How to Determine the Compression Top Dead Center of Cylinder 1

1 Answers
Felicity
07/29/25 3:14pm
Methods to determine the compression top dead center of cylinder 1: 1. First locate the compression stroke, then identify the compression top dead center; 2. Observe the top dead center timing marks on the engine—when the marks align, it indicates top dead center; 3. Check the crankshaft connecting rod journal—when the connecting rod journal of cylinder 1 is at its highest point, it is top dead center; 4. Observe the jet from the spark plug hole of cylinder 1—insert a paper ball into the spark plug hole of cylinder 1, rotate the crankshaft, and when the paper ball is ejected, turn the crankshaft slightly further in the direction of rotation to reach top dead center; 5. Using the static top dead center mark on the engine flywheel as a reference, manually rotate the engine to bring the piston to the top of the cylinder and then slightly lower it. Carefully locate the highest point of the piston using methods such as a dial indicator and midpoint stroke measurement—this is the top dead center.
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