On all the engines with dissies/CAS' (with teeth) that I've played with, the cam under the oil filler cap (710 cap) has a notch to show it's at No1 TDC, and both the dissy casting and the gear/shaft have a notch in them that you line up to place it (the dissy/cas) at No1 TDC.
The same may or may not be true for a 1G....
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