hey Dave
set your TDC marks up on No 2 cylinder at 180 degrees
then once set, measure No 1 and see if it is still in phase, should now be 0 degrees
No 2 cylinder cannot move but No 1 and 3 cylinders can be knocked out of phase
Just a check as when setting ignition up on No 1 there can be an error if No 1 has had a hydraulic lock and has been retarded against the crank phasing
Make sense ?
set your TDC marks up on No 2 cylinder at 180 degrees
then once set, measure No 1 and see if it is still in phase, should now be 0 degrees
No 2 cylinder cannot move but No 1 and 3 cylinders can be knocked out of phase
Just a check as when setting ignition up on No 1 there can be an error if No 1 has had a hydraulic lock and has been retarded against the crank phasing
Make sense ?