1985 International F5070 Engine: 14L L6 DIESEL; With 49 5/8 In. Belt Outside Circumference; Optional Belt; Position: Fan;. 1986 International F5070 Engine: 14L L6 DIESEL; With 49 5/8 In. 1987 International F5070 Engine: 14L L6 DIESEL; With 49 5/8 In.