Cracked Piston

[Hank Z]

I have cracked piston. I was cleaning the carbon off the top of them and noticed a small crack. The intake valve was not seating properly on that cylinder causing the backfiring. In general, what could be some of the causes for the piston to be cracked?

[jrapose]

Using starting fluid can crack a piston or water will do it too.... what has happened is that at one time too much pressure was developed....in the ole days we used a fine spray of water to decarbon a chamber...but you had to be careful not to spray too much water or you would risk cracking a piston....water flashes into steam and removes carbon deposits.... at one time you might have had a leaking head gasket..that does it too.

[Tom Wesenberg]

I've seen burned pistons, and one piston with a crack in the skirt, but don't ever recall seeing a crack in the top of a piston.

[Hank Z]

thanks for your responses. I think I may look for another engine as i am seeing other issues as well.

[Synchro909]

If there is a crack in the top of the piston, I suspect you got it just in time. It would have broken very soon and caused a whole lot more pain It doesn't surprise me that you are finding other issues. Sounds like another motor or a rebuild is in order.

[tbirdtbird]

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too much advance leading to detonation which is very destructive