Help, my first tractor engine is full of cracks!! The 207D has cracks from the top deck all the way down through one of the mains! I bought another block and it was worse-cracks all the way down through three mains!! Are all 207D's cracked? Can this be repaired? Can I possibly find a rebuildable block? Any suggestions?? I'm retired (retarded) and on a tight budget. Thanks for your help, Ron