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there should be a white decal on the upper rad support bar that shows you the belt routing,in not then draw how the belt is routed before you take it off the car.the parts store may have a routing diagram,if the belt broke then if you know someone with the same type and engine size maybe they will let you look at the belt routing.you can also go to the library and take out a book or draw the routing from the book for your car.
draw a diagram first of how it goes around the pulleys.make sure its accurate,and each pulley is named,ie aircon,geni,p/steer/crank/,then usually just need to detension belt by backing off the belt tensioner[use good size spanner or fixed socket on bar]slip belt off.the tensioner usually just springs back,fit new belt reverse way,check against diagram before starting
For the 1991 Ford F150: Click on the following Free direct Link. It has several Diagrams including the correct Belt Diagrams for you 1991 Ford F150 with your unspecified Engine Size and various Engine Options.
Use the (B) 1/2 inch square hole in the drive belt tensioner pulley hub to rotate the (A) drive belt tensioner clockwise and remove the (C) drive belt.
The diagram should be on a sticker somwhere under the hood, on the side fender area, or near the front of the truck. Or before you remove the belt draw a sketch to remember the routing of the belt.