Here is a dumb question about a cranshaft

[ChrisP911]

I had my crankshaft checked out, Today I get a call that it is cracked at the first two rod journals are cracked. So the dumb question is can it be re-welded.

[Hil911]

If it were mine, I wouldn't. That's based on my feeling rather than knowledge.

It seems to me that cracks result from two causes: fatigue (thermal or mechanical), or brief, extreme stress events.

Either way, cracks concentrate stress which is why they propagate. Similarly, I really doubt whether a weld could either close up a deep crack or not itself allow stress concentration. And the crankshaft has provably already had a hard life. There are two cracks but it's hard to believe that the rest of the crank is in virgin condition.

If I welded the crank, I would be just waiting for it to fail again, every time that I pushed it.

Hil

[ChrisP911]

that's what I thought. I called 5 machine shops and they said no go.

[ChrisP911]

So it just scrap metal.

[Bleedsblue]

I would call it expensive art.

[TimT]

So it just scrap metal.

Pretty much. What engine is the crank from? You can get good used cranks, measured and cleaned for not to much dinero from a number of sources...

[irl]

[ChrisP911]

Love the lamp Idea