m103~300e 1991 expert help needed

[gavinbr]

Hello.

Have just replaced my head gasket on the above engine.

However, I now have the valves hitting the pistons, no damage!

Have followed the instructions for mecanical timing, that is TDC on the harmonic balancer, and the dot on the cam shaft in line with the marker, and both valves on#1 closed. The cam sprocket in the pin hole for that purpose.

Question for the experts, it appears that when the piston on #1 is on top dead center [ noted visually] the harmonic balancer shows it in line with the magnet for the ignition timing? Suggesting that is TDC and not O/T?

Question, what should you use as the TDC mark on the harmonic balancer?
Tha manual say's use O/T, reference Engine job 05-2230 mech., timing

Thanks

Brian