Quote:
Originally Posted by Marco Tahtaras
I may be misunderstanding some of the suggestions but you would be lucky to get close to TDC by watching the piston through the spark plug hole. It can however assist you in knowing you are close to finding the indent in the timing gear.
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Exactly the reason. To get close and not go past the mark. It is a lot easier to be prepared to stop on the mark than it is to backup to the mark or crank it around again. The rotor is a better clue, and a lot easier,
IF it can be trusted (i.e. the car was currently running).