; HomeHeavy Duty Truck PartsEngines & Engine PartsEngine AssysCaterpillarOtherUsed 1998 CAT C12 (40 PIN) 1YN 9NS Engine Assy Used 1998 CAT C12 (40 PIN) 1YN 9NS Engine Assy Unfortunately this part is temporarily unavailable. View other Caterpillar Other Engine Assys