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Idahome
Joined: Wed May 2nd, 2018
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Basically you rotate the engine with your wet finger in the spark plug hole. Once you feel air rushing OUT past your finger this is compression stroke
Another method for this is to place a small piece of tissue or just paper in the plug hole and rotate engine, when the paper blows out of the hole you are on compression stroke
Now with a flashlight (sometimes and a mirror) if you can see in the spark plug hole you physically watch the piston travel up to its topmost position and then when it pauses and then the moment is starts to drop back downward STOP, and back up just ever so slightly. this is TDC on compression stroke for that cylinder. If you cannot see inside the cylinder you can CAREFULLY place a long skinny screwdriver in the spark plug port and watch until the piston pushes the driver to its upmost position, again this is TDC
Boroscope is also handy for finding the exact TDC
There are other methods but these ones have ALWAYS worked for me
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks