Kudos to Chris Bamford, who posted a picture 3-4 years ago regarding straightening a crank. He had to press .320" to effect a beneficial bend.
I had to work up to .385, twice to take a .001 (.002 TIR) bend out of my crank. It worked swell, though I need some aspirin for my back after lifting that block up to my press.
Even my press is the same color as Chris', so success was practically guaranteed!
Years ago I was taught to strike in the corner radius with a similarly blunt cold chisel while backing up the crank on the opposite side. The theory was that the chisel would stretch the material on the low side to combat the bow in the crank.
I was also taught that no matter what method you use to straighten a crank, always grind and install right away. The story was that the bend would come back. The support of the engine bearings would supposedly prevent this. I don't know if this was an "out of sight, out of mind" mentality. Or was based on actual fact.
in 2 hours, 1/2 the bend did come back.
Redid the persuasion with vigor and is now straight as an arrow...with only 1/4 thou out of round on the journal showing
Thanks Scott, it was fun to see my name in the thread list. Glad it worked out for you.
This process is so fun to see and hear about. I would never have thought to try it.
Thanks for another eye opener.
This IS very interesting.
385 thou! Twice.
I too thought I'd have to peen a 28 Chev crank that's bent a bit worse but I only pushed to 100 thou and couldn't get the peening method firmly implanted in my noggin'.
Many thanks for sharing this!
Same idea. Slightly different approach.