Sometimes you need to find Top Dean Center. One reason is for adjusting your timer rod... or whatever.
I thought that since I had to take my radiator off (don't ask!) I would show you a simple mod I made some time ago.
On my crankshaft it turns out that the hole is drilled 90 degrees to the plane of the throws. I filed a notch on both sides of the pulley and then when assembled I put some yellow paint into the TDC notch, leaving the BTC notch devoid of yellow paint. Then I put a stripe of paint on the rib above the crankshaft... Voila, TDC is marked!
When I was setting the contacts on a vintage $1 Advertiser Anderson style timer on my other car I used this method to set the engine to TDC and then taped an home made degree wheel to the radiator using the hand crank as an indicator. Then accurate setting of the contacts all at 0 degrees or 180 degrees to each other was a piece of cake.
"Top Dean Center" ... James Dean has been dead several years now, I think I meant "Top Dead Center"!
The first photo shows both the TDC mark on the left (Yellow) and the BDC mark on the right (red). In the second photo I've turned the engine so it is set at TDC. It might be interesting to note the Anderson style timer on this RHD engine. It is mounted "upside down", and a hole has been drilled (you can't see it) at the bottom to make sure that any oil getting past the modern seal has a place to exit.
For newbies: Not just Terry's but all T crankshafts have the pin hole drilled 90 degrees to the throw of the crankshaft. I like the use of the rib as a pointer. That is a great idea.