One problem related to diesel engine has been reported for the 2004 International 4400. The most recently reported issues are listed below.
: the contact stated after shutting the vehicle down, the bottom liner o-ring propelled through the number 4 cylinder. The radiator fluid drained into the oil which resulted in the engine seizure. The vehicle was towed to the dealer and the engine was over hauled. The manufacturer was alerted. Updated05/16/06.