Crack in #1 cylinder?????

[TomB]

if you hone it down a little and still see a mark its toast.

Not always, sometimes it can be just staining in the cast iron, cast iron is porous and can stain but leave the top surface smooth so still perfectly use-able, I've used many bores showing this staining without any issues.

[TomB]

A crude check for a crack on a liner, hold up the barrels as lightly as possible and "ring" each liner where it hangs out of the barrels, use a small hammer or something like the end of a wrench and gently tap each liner, the cracked one may sound dull compared to the others.

Keep the old skills alive

Wheel tapping Clicky




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[senrak]

Crack is no crack. Simply a water stain. Honing made it like new. Whew.

[MPittma100]

Crack?

I agree. Verify that it is a crack or not. A crack in a cylinder is usually vertical. Unlike the one shown in your pictures. Quite likely, as stated, this may be a mark from a ring. Worth a trip to a machine shop to verify.

MP

[MPittma100]

Another Thought

One other thing. Can you feel it with your finger nail? May try a few passes with a cylinder hone to see if it tries to go away.

MP