Take all the spark plugs out.
(the engine rotates more easily with the spark plugs out)
Place a cork in the #1 cylinder spark plug hole.
Rotate the engine by hand (maybe by rotating the fan belt).
The cork pops out on the firing/compression stroke.
There are more technical ways to determine "the correct number 1 cylinder position".
Also: "Most old school mechanics would just use the finger method. Place one finger over over the end of the hose [that you have inserted into the #1 stpark plug hole], then rotate the crankshaft (clockwise is best but not essential)." (
finding TDC
