flywheel-6-protractor-fitted-turn

...and then turn the engine gently till it touches the 'dead-stop' the other way. Adjust the protractor until the numbers read the same 'before' and 'after'. Your '0' is now the real TDC.

…and then turn the engine gently till it touches the ‘dead-stop’ the other way. Adjust the protractor until the numbers read the same ‘before’ and ‘after’. Your ‘0’ is now the real TDC.