1991 F150 Wiper Motor Removal

In 1975, Ford bridged the gap between its light-duty F-100 and the F-250 with the new F-150. In 1984, Ford no longer saw a market for the F-100 and the F-150 became the smallest F-series truck. The 1991 F-150 came standard with a 145-horsepower, 4.9-liter, in-line six-cylinder engine. It also had a 185-horsepower, 5.0-liter V-8 engine and a 210-horsepower, 5.8-liter V-8 engine available. The 1991 F-150 came standard with two-speed wipers, and had the option to add intermittent wipers. A small electric motor that connects to a linkage drives the windshield wipers back and forth. A do-it-yourself mechanic can replace the wiper motor in the 1991 Ford F-150 with relative ease.

Instructions

Trace the wiper arm until you reach where it connects to the F-150 and locate the locking tab holding the arm to the pivot shaft. Lift the wiper blade from the windshield and slide the locking tab to the passenger's side to unlock it. Lift the wipe blade and ram from the truck.

Repeat Step 1 for the other wiper blade.

Remove the bolts securing the wiper cowl to the truck, with a ratchet and socket, and slightly lift the cowl. Remove the washer fluid hose connecting to the bottom of the cowl. Pull the cowl from the truck, exposing the wiper motor below it.

Remove the bolts securing the plastic trim above the wiper motor, using a ratchet and socket, and pull the trim from the F-150, if needed.

Place the blade of a flat-head screwdriver under the clip holding the wiper linkage to the motor's arm and pry the clip from the arm. Save this clip for reuse.

Unplug the wiring harness from the rear of the motor. Remove the three wiper motor retaining bolts with a ratchet and socket and pull the motor from the truck.

Set the new wiper motor in place, guiding the motor's output shaft into the hole in the wiper linkage. Tighten the wiper motor bolts to 5 to 7 foot-pounds with a torque wrench and socket.

Set the wiper linkage clip on the end of the wiper motor arm and press it until it snaps into place. Plug the wiring harness into the rear of the wiper motor.

Reinstall the trim piece above the wiper motor, if removed, and tighten the bolts with a ratchet and socket.

Press the washer hose back onto the wiper cowl and set the wiper cowl back on the truck. Tighten the wiper cowl bolts with a ratchet and socket.

Set the wiper blades back on their respective shafts. Position the blades so the center of the wiper blade on the driver's side is 2 to 3 inches from the bottom of the windshield and the passenger blade is 1-3/4 to 3 inches from the bottom of the windshield. Use a tape measure to verify the correct spacing.

Slide the locking tab on both wiper arms toward the driver's side of the F-150 to lock the arms in place.