Mac, I feel your pain. I also bought a 3a with a "rebuilt engine" that had a nice crack in it that could not be repaired. Ended up buying a used engine from KW that is running great...knock on wood, so far so good. Where did you get this replacement engine? Will the seller make this right? I hope that years from now you can look back and laugh about all this as you drive off into the sunset in a fine running Willys. Until then...small claims court beckons.