Old black and white movie on TV. Some guy in a suit tell the others he’s the only way to defeat the evil and climbs a construction crane gets out on the edge of it and swings it through the flaming head of the devil in the sky which then explodes and disappears He killed himself to save everyone
It’s “Quatermass and the Pit”(1967), but it was actually in color. The scene you describe is at the end.
I suppose it also could be the 1958 television miniseries which was in black and white, although I haven’t seen that version.
I have the TV version on VHS. It is the same in both versions.
Here is a trailer which has images from the scene you describe.
http://www.youtube.com/watch?v=BhDUbQ9xFMM
My memory was off. In the TV version he doesn’t get on a construction crane. Hey, it’s low budget. You can watch it on YouTube. It’s good in its own way.
So it is definitely Quatermass and the Pit(1967),a.k.a. Five Million Years to Earth
Thanks for the assist Will!
OP never came back.
That one gets asked a lot.
Oh well I can’t make people confirm answers.