Now that I have broken the crank shaft. I have found in the garage 3 crank shafts I suspect are new based on how they came from 50 years ago. How do I date them I'm not seeing any numbers but still looking. Dads collected parts for 50 plus years and one can find almost anything one looks for if you look long enough.
Have them Magnafluxed and measure them with a micrometer. They are either good or bad. It doesn't mater what year they were made.
1909-24 cranks with the diamond shaped throws are more crack prone than '25-'27 straight sided cranks: (see pic)
(photo by Keith Gumbinger)
Best of all Ford cranks are the 1926/27 EE marked cranks:
(picture by Chester Leighton)
They were all 1.248" diameter when new. That's a bit thin, Ford didn't know much about metal fatigue back in 1907/08 when it was designed.
I have seen no difference in what design the crank is for cracks either.
The factory is responsible for many of the cracks, as when they cleaned up the forgings with stones that had no radius.
Roger Thankyou very much Once I see what i'm looking for I can find it in most cases The 3 we have are early cranks Thanks Colin
Thank you to every body I now have a plan, first I will round up some parts, the car has a wedding pictures only she still looks pretty than we will start the repair.