1990 Ford FT900 7.8L 6 Cyl DIESEL. 1991 Ford FT900 7.8L 6 Cyl DIESEL. 1992 Ford FT900 7.8L 6 Cyl DIESEL. 1993 Ford FT900 7.8L 6 Cyl DIESEL. 1993 Ford FT900 8.3L 6 Cyl DIESEL. Notes: Radiator Cap/Cooling System Tester Adapter -- System adapter on tester.