TDC (Top Dead Center) is the point in an engine’s cycle where the piston reaches its highest position in the cylinder. Finding TDC is important for setting ignition timing and valve timing. The compression stroke is the part of the engine cycle where the piston moves up the cylinder, compressing the air-fuel mixture. Knowing how to find TDC on the compression stroke can be helpful for diagnosing engine problems and making adjustments.
There are a few different ways to find TDC on the compression stroke. One common method is to use a piston stop. A piston stop is a tool that screws into the spark plug hole and prevents the piston from moving. Once the piston stop is in place, the engine can be cranked over until the piston hits the stop. This will be TDC on the compression stroke.
Another method for finding TDC is to use a timing light. A timing light is a tool that flashes a bright light at the engine’s crankshaft pulley. The timing light is connected to the engine’s ignition system, and it flashes when the spark plug fires. By pointing the timing light at the crankshaft pulley, you can see when the timing mark on the pulley lines up with a mark on the engine. This will be TDC on the compression stroke.
