1989 Western Star 6900 Engine: 14L L6 DIESEL; With V-Belt Drive;. 1990 Western Star 6900 Engine: 14L L6 DIESEL; With V-Belt Drive;. 1991 Western Star 6900 Engine: 14L L6 DIESEL; With V-Belt Drive;. 1992 Western Star 6900 Engine: 14L L6 DIESEL; With V-Belt Drive;.
