Wiper arm removal

REMOVAL

1. Raise and support the hood.
2. Remove the windshield wiper pivot arms.
3. Remove the cowl top vent panels.

1. Disconnect the windshield wiper mounting arm and pivot shaft.

1. Remove the access cover from the dash panel.
2. Remove the mounting arm and pivot shaft retaining clip.
3. Disconnect the windshield wiper mounting arm and pivot shaft from the windshield wiper motor.

1. Remove the windshield wiper motor.

1. Disconnect the electrical connector.
2. Remove the three bolts.
3. Remove the windshield wiper motor.

INSTALLATION

1. Install the mounting arm and pivot shaft retaining clip on the windshield wiper mounting arm and pivot shaft.

1. Install the windshield wiper motor.

1. Place the windshield wiper motor in the dash panel.
2. Install the three retaining bolts.
3. Reconnect the electrical connector.

1. Reconnect the windshield wiper mounting arm and pivot shaft.

1. Press on the windshield wiper mounting arm and pivot shaft after it is aligned with the windshield wiper motor.
2. Install the access cover in the dash panel.

1. Install the cowl top vent panels.
2. Install the windshield wiper pivot arms.
3. Adjust the windshield wiper pivot arms.

This is technically for the V6 4.2L but I'm sure those Ford E250's have the same setup for windshield wiper motor. Let me know how it goes.

Check where the pivots attatch to the wiper arm. There is a plastic cap you remove and under it is a nut, and if it's loose, you need to get the wiper motor to park...by turning on the wipers, and then off and wait untill it sounds like it has stopped. Then place the wiper arms to where they belong parked, and tighten the nuts.

Front Wiper Motor Removal & Installation

NOTE A new wiper motor assembly comes with the linkage arm installed.

1. Before servicing the vehicle, refer to the Precautions Section.
2. Remove the windshield wiper mounting arm and pivot shaft
   WARNING Do not remove the wiper motor linkage arm from the wiper motor assembly. If the arm is removed, the wiper arms may not park in the correct location.
   NOTE Use a suitable tool to separate the wiper linkage arm from the wiper mounting arm and pivot shaft assembly.
   
3. Remove the 3 bolts and the wiper motor.
   
   
   
   Fig. Wiper motor and linkage
   

To install:

1. Install wiper motor and bolts.
2. Tighten wiper motor bolts to 10 ft. lbs. (13 Nm).
3. Install windshield wiper mounting arm and pivot shaft.
4. Check wiper operation.

Rear Wiper Motor - Removal & Installation

1. Remove the rear pivot arm.
2. Remove the rear wiper motor shaft nut cover
3. Remove the rear wiper motor shaft nut.
4. Open the lift gate window.
5. Remove the rear wiper motor cover trim panel.
6. Disconnect the electrical connector.
7. Remove the 2 rear window wiper motor nuts
8. Remove the rear window wiper motor.
   
   
   Fig. Rear wiper motor view-2008 model shown, other years similar
   

To install:

1. Install rear wiper motor and tighten mounting nuts to 62 inch lbs. (7 Nm).
2. Reconnect the electrical connector.
3. Install wiper motor cover trim panel.
4. Install rear wiper pivot arm tighten nut to 53 inch lbs. (6 Nm).
5. Install shaft nut cover.
   
6. Check wiper operation.

Good luck (remember rated this post).

Wiper Pivot Arm Removal and Installation

1. Lift the windshield wiper pivot arm to the full upright position.

1. Remove the windshield wiper pivot arm.
   1. Release the locking tab.
   1. Remove the windshield wiper pivot arm.

1. NOTE: During installation, it is necessary to pull the locking tab out to its full open (unlatched) position and hold while assembling the pivot arm onto the mounting arm and pivot shaft. Align the key on the pivot arm head with the keyway on the shafts. This will make sure the pivot arm is correctly aligned. If necessary, the key can be removed. To adjust wiper pivot arms, refer to Wiper Blade and Pivot Arm Adjustment in this section.
   To install, reverse the removal procedure.

I assume that you are speaking of the pivot arm. If I have this wrong please let me know so that I can provide the proper diagram. You have to lift the wiper arm off the windshield and pry the small tab in the diagram aside and let the tension on the wiper arm hold it aside. Here is a link to the pivot arm diagram ~ http://s219.photobucket.com/albums/cc270/anubiscycle/?action=view&current=wiperpivot.jpg

SECTION 501-16: Wipers and Washers 1999 Town Car Workshop Manual REMOVAL AND INSTALLATION Mounting Arm and Pivot Shaft Removal

1. Disconnect the battery ground cable (14301).

1. Remove the windshield wiper pivot arms (17527).
   1. Remove the nuts (one each side).
   1. Remove the windshield wiper pivot arms.

1. Remove the LH and RH cowl top vent panels.
   1. Remove the hood weatherstrip.
   1. Remove the screws.
   1. Remove the retaining clips.
      • Disconnect the LH and RH washer hoses.

1. Position the windshield wiper mounting arm and pivot shaft (17566) assembly aside.
   1. Remove the nuts.
   1. Remove the bolt.
   1. Position the windshield wiper mounting arm and pivot shaft assembly aside.

1. Remove the windshield wiper mounting arm and pivot shaft assembly.
   1. Disconnect the electrical connector.
   1. Remove the windshield wiper mounting arm and pivot shaft assembly.

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Motor —Windshield Wiper Removal

1. Remove the windshield wiper mounting arm and pivot shaft (17566) assembly; refer to Mounting Arm and Pivot Shaft .

1. Remove the windshield wiper motor (17508).
   1. Remove the output shaft bolt.
   1. Remove the bolts.
   1. Remove the windshield wiper motor.

please rate as fixya if this is what you need. Mounting Arm and Pivot Shaft —Windshield Wiper Removal
NOTE: The windshield wiper pivot arms (17526) must be in the highest position to remove them.

1. Turn the ignition switch (11572) to the on position.

1. Turn the windshield wiper (17500) on.

1. Stop the windshield wiper pivot arms at the highest position by turning the ignition switch off.

1. Remove the windshield wiper pivot arm.
   1. Remove the pivot arm nut cover.
   1. Remove the nut.
   1. Remove the windshield wiper pivot arm.

1. Raise and support the hood (16612).

1. Remove the cowl grille seal.

NOTE: The two cowl grilles overlap at the center. The LH cowl grille must be removed first.

1. Remove the LH cowl grille.
   1. Remove the screw cover.
   1. Remove the screws.
   1. Remove the clips.
   1. Remove the pin-type retainer.
   1. Remove the LH cowl grille.

1. Remove the RH cowl grille.
   1. Remove the screw cover.
   1. Remove the screws.
   1. Remove the clips.
   1. Remove the pin-type retainer.
   1. Remove the RH cowl grille.

1. Remove the mounting arm and pivot shaft.
   1. Disconnect the electrical connector.
   1. Remove the bolts.
   1. Remove the mounting arm and pivot shaft.

Remove the rear pivot arm.
Lift the pivot arm to the upright position.
Slide the locking tab out.
Pull up and remove the pivot arm.
Remove the rear wiper motor shaft nut cover.
Remove the rear wiper motor shaft nut.
Remove the rear wiper motor cover.
Remove the rear wiper motor bracket nut.
Remove the bolt and the rear wiper motor.

Here is the procedure to remove the wiper motor. It says to remove wipers by removing the nut covers then remove the wiper nuts. Is this what your talking about?
If your talking about the wiper arms they just pop off at the swivel.
Use this link for info on removing blade assy.
http://www.autozone.com/az/cds/en_us/0900823d/80/04/f8/26/0900823d8004f826/repairInfoPages.htm

Wiper Motor
Removal & Installation

1. Before servicing the vehicle, refer to the Precautions section.
2. Park the wiper pivot arms in the highest position on the glass.
3. Disconnect the battery ground cable.
4. Remove the wiper pivot arm nut covers.
5. Remove the nuts and the wiper pivot arms.
6. Remove the cowl top vent panels.
7. Remove the four bolts, wiper mounting arm and wiper pivot shaft assembly.
8. Disconnect the electrical connector.
9. Remove the bolt and the windshield wiper motor operating arm from the motor.
10. Remove the three bolts and remove the windshield wiper motor.
11. To install, reverse the removal procedure.

1. Remove the rear pivot arm; refer to Pivot Arm—Rear .
2. Remove rear pivot arm.
   1. Lift the pivot arm nut cover.
   1. Remove the nut.
   1. Remove the pivot arm.

1. Remove the liftgate door trim panel; refer to Section 501-05 . Remove the (A) liftgate handle to liftgate screws and the (B) liftgate handle. Remove the liftgate trim panel screw access plug. Remove the screw.
2. Remove the liftgate door trim panel.
   1. Use Windshield and Molding/Trim Removal Kit to remove the liftgate door trim panel from the liftgate window opening.
   1. Push the liftgate door trim panel toward the top of the liftgate and remove the liftgate trim panel.

1. Position the watershield aside to gain access to the rear wiper motor.

1. Remove rear wiper motor.
   • Disconnect electrical connector.
   • Remove three retaining bolts.
   • Remove rear wiper motor.

good luck.