Clearly that "rebuild" was junk. If they used flanged\o-ringed sleeves like most reputable people do, a crack in the cylinder wall should be a non-issue. 03-04 4.6s supposedly used the sloppiest built blocks but regardless of that any 89-2004 3.9-4.6 engine can crack if overheated bad.The 2nd engine was a re-manufactured engine from reputable dealer in Florida. Unfortunately, the one year warranty has expired. I'm done with these flawed 2003-2004 Discovery engines.
Try and get your mechanic to use the moroso ceramic seal as instructed and if it ever fails, add more. Obviously a good time yourself an ultragauge to monitor temps, the D2's gauge is useless.
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