I remove the wiper arm & the outsdie lock of the shaft,remove the screws that hold the wiper motor inside, to I need to remove the 20mm nuts that hold the rubber seal outside the glass (in which I can not unscrew or remove),then how can I remove the wiper motor.is there anything holding the shaft from rubber seal inside & outside the glass?

Removal

1. Remove wiper arms.
2. Remove cowl panel.
3. Disconnect blower motor electrical connector and vent tube.
4. Remove blower motor retaining screws.

1. Remove fan retaining nut from blower shaft through plenum opening while holding the fan from the engine compartment.
2. Remove fan from blower motor while removing blower motor from vehicle.

Installation

1. Hold fan through plenum opening.
2. Install blower motor to vehicle while installing fan to blower motor.
3. Install fan retaining nut to blower motor shaft through plenum opening.
4. Install blower motor retaining screws.
5. Connect electrical connector and vent tube.
6. Install cowl panel.
7. Install wiper arms.

Hi there:
Isnt a diagram but If you have removed the motor, here is the motor installation procedure....

INSTALLATION PROCEDURE



Align the wiper motor to the wiper drive system module. NOTE: Refer to Fastener Notice in Service Precautions.
Install the wiper drive system module to wiper motor screws. Tighten Tighten the wiper drive system module to wiper motor screws to 7 N.m (62 lb in) .
Connect the electrical connector to the wiper motor.
Install the crank arm on the wiper motor.




Rotate the washer solvent container into the installation position.
Install the washer solvent container screws. Tighten Tighten the washer solvent container screws to 6 N.m (53 lb in) .
Inspect the wipers for proper operation.




Also, here is the crank arm procedure...

REMOVAL PROCEDURE

Remove the wiper system module cover.
Remove the drive link from the wiper motor crank arm.

2.1. Loosen the drive link screws.
2.2. Remove the drive link from the wiper motor crank arm.

Remove the wiper motor crank arm cover and seal.
Remove the wiper motor crank arm from the wiper motor.

4.1. Loosen the wiper motor crank arm screw.
4.2. Tap on the wiper motor crank arm screw with a soft-faced mallet while holding up on the wiper motor crank arm until the wiper motor crank arm loosens from the wiper motor.
4.3. Remove the wiper motor crank arm screw and the wiper motor crank arm from the wiper motor.

INSTALLATION PROCEDURE




Install the wiper motor crank arm onto the wiper motor.

1.1. Turn the ignition switch to the ACCY position.
1.2. Set the wiper switch to PULSE position. The wiper motor should be operating.
1.3. Turn the ignition switch to OFF when the wiper motor is in the innerwipe position.

IMPORTANT: Do not rotate the wiper motor shaft during the installation of the wiper motor crank arm.

1.4. Install the wiper motor crank arm on the wiper motor while maintaining a 4-8 mm (0.157-0.315 in) gap between the V-grove in the wiper motor crank arm and the tab.

NOTE: Refer to Fastener Notice in Service Precautions.

Install the wiper motor crank arm screw. Tighten Tighten the wiper motor crank arm screw to 16 N.m (12 lb ft) .
Install the wiper motor crank arm cover and seal.




Check the gap between the wiper motor crank arm and tab. If the gap is not 4-8 mm (0.157-0.315 in) , remove the wiper motor crank arm and repeat installation steps.
Install the drive link onto the wiper motor crank arm.
Install the drive link screws. Tighten Tighten the drive link screws to 5 N.m (44 lb in) .
Install the wiper system module cover.
Inspect the wipers for proper operation.

Additional procedures: Wiper Motor Module Replacement.

TOOLS REQUIRED
J 39822 Wiper Arm Puller

REMOVAL PROCEDURE

Turn the ignition switch to the ACCY position.
Set wiper switch to the PULSE position.
Turn the ignition off when the wiper arms are in the innerwipe position and not moving.
Disconnect the washer hose from the washer nozzle.
Remove the cover from the wiper arm nut.
Remove the wiper arm nut from the wiper transmission drive shaft.
Using J 39822 remove the wiper arm from the wiper transmission.
Remove the wiper blade from the wiper arm.
Clean the knurls of the wiper transmission drive shaft with a wire brush.



Install the wiper blade onto the wiper arm.
Install the wiper arm onto the wiper transmission drive shaft. IMPORTANT: Hold the measuring device at 90 degrees (perpendicular) to the wiper blade tip.
Measure the distance from the wiper blade tip to the solid edge of the windshield blackout. Position the wiper arms at the following distances:

LH - 147 mm (5.79 in) above the glass blackout.
RH - 123 mm (4.84 in) below the glass blackout.

NOTE: Refer to Fastener Notice in Service Precautions.



Install the wiper arm nut onto the wiper transmission drive shaft. Tighten Tighten the wiper arm nut to 48 N.m (35 lb ft) .
Install the cover on the wiper arm nut. IMPORTANT: Lubricate the washer hose with the windshield washer solvent to ease installation on the washer nozzle.
Install the washer hose on the washer nozzle.
Inspect the wipers for proper operation.



Remove the wiper arms from the vehicle.
Remove the air inlet grille panel.
Remove the wiper motor.
Remove the air inlet panel to wiper motor module screws.
Remove the wiper motor module from the vehicle.
Remove the insulators from the wiper motor module.

INSTALLATION PROCEDURE

Install the insulators onto the wiper motor module.
Align the wiper motor module to the air inlet panel. NOTE: Refer to Fastener Notice in Service Precautions.
Install the air inlet panel to wiper motor module screws. Tighten Tighten the air inlet panel to wiper motor module screws to 10 N.m (89 lb in) .
Install the wiper motor.
Install the air inlet grille panel.
Install the wiper arms onto the vehicle.
Inspect the wipers for proper operation.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

There is a nut under the black plastic bezel that needs to be removed. Here is the complete procedure for you to look at. Its possible that your arm isn't adjust at wiper motor...

REMOVAL
- Disconnect and isolate the battery negative cable.
- Remove the rear wiper arm from the rear wiper motor output shaft. (Refer to 8 - ELECTRICAL / REAR WIPERS / WASHERS/REAR WIPER ARM - REMOVAL).
- Using a small thin-bladed tool, gently pry at the notch in the base of the rear wiper motor output shaft bezel to unsnap the nut cover from the bezel (REAR WIPER MOTOR OUTPUT SHAFT NUT REMOVE/INSTALL). Be certain to take proper precautions to protect the outer tailgate panel and its paint finish from damage during this procedure.
- Remove the nut that secures the rear wiper motor output shaft to the outer swing gate panel (REAR WIPER MOTOR OUTPUT SHAFT NUT REMOVE/INSTALL).
- Remove the bezel and gasket from the rear wiper motor output shaft.
- Remove the trim panel from the tailgate inner panel. (Refer to 23 - BODY/SWING GATE/TRIM PANEL - REMOVAL).
- Disconnect the tailgate wire harness connector for the flip-up glass ajar switch from the flip-up glass latch connector receptacle.
- Disconnect the tailgate wire harness connector for the rear wiper motor from the motor connector receptacle (REAR WIPER MOTOR REMOVE/INSTALL).
- Loosen the two screws that secure the rear wiper motor mounting bracket to the top of the tailgate inner panel.
- Slide the rear wiper motor and mounting bracket forward far enough to disengage the two mounting screws from the keyed slots in the top of the tailgate inner panel.
- Remove the rear wiper motor and mounting bracket from the tailgate as a unit.



1 - BEZEL AND GASKET
2 - OUTPUT SHAFT
3 - TAILGATE OUTER PANEL
4 - NUT
5 - NUT COVER

What you will need to do is to remove the small plastic cap on the wiper arm by prying it off with a screw driver. Then remove the nut that holds the arm onto the shaft. Then get yourself a battery cable puller (from auto parts store) and pull the arm off of the shaft..



1 - SPARE TIRE
2 - WRENCH
3 - FLIP-UP GLASS
4 - PARK RAMP
5 - REAR WIPER ARM
6 - PIVOT COVER

I'am not sure what you mean by the bushing, but I just repaced the wiper motor in my 95 Dakota.
1-remove wiper arms from the pivots.
2-open the hood
3- remove the crowl. there is a line of screws that need to taken out. set the crowl out of the way.
Don't try to remove the motor without removing the crowl. It just won't work.
4- remove the 3 nuts that hold the motor to the firewall.
5 carefully pull out the motor and wiper linkage.
6- remove the nut that hold the linkage onto the motor and remove the linkage. BE CAREFUL you don't want to drop and loose that nut. There is a flat spot on the shaft between the motor and the linkage where a 6" adjutable wrench etc can be put to hold the shaft when taking off the nut.

Follow the above steps in reverse to reinstall. I did use lock tite to make sure the nut doesn't come off the motor shaft.

Try to run the motor without the wiper arms tightened down and turn it off so it can cycle down to its rest state. Then install the wiper arms.

Make sure, that the car's windshield wiper wiring is correct for this motor.
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Wiper Arm & Blade Removal & Installation Front To Remove:
CAUTION
When the wipers are parked (off), the driver’s wiper arm must be above the passenger’s wiper arm.

1. Remove the clip holding the outside end of the wiper arm cover to the arm.
2. Lift the arm cap up to expose the nut.
3. Remove the wiper arm mounting nut.
4. Using a suitable two jaw puller, remove the wiper arm from the wiper pivot.

To Install:

1. Verify that the wiper motor and linkage are in the parked position.
2. Place the wiper arm in position over the wiper pivot.
3. Install the nut to hold the wiper arm to the wiper pivot. Torque nut to 26 ft. lbs. (35 Nm). CAUTION
   Make sure to tighten the wiper arm nut properly.
   
4. Push the arm cap cover down.
5. Secure the clip holding the cover to the wiper arm.

Rear To Remove:

1. Lift and hold the wiper arm away from the rear window.
2. Lift the lock securing the wiper arm to the pivot.
3. Slowly release the wiper arm so it rests against the lock.
4. Remove the wiper arm from the pivot.

To Install:

1. Install the wiper arm on the pivot.
2. Pull the arm outward and release the lock.
3. Gently release the wiper arm until it rests on the rear window.

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).

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.

----------------------------------------------------------------------------------------
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.

According to the Haynes repair manual Chapter 12:

1. Disconnect the negative battery cable
2. Detach washer hoses, lift the wiper arm covers and mark the wiper arm locations on the pivot shaft for later re-installation. Remove the wiper pivot nut and remove the wiper arms.
3. Remove the cowl cover (from chapter 11)
3a. Remove the wiper arms then remove the screws that hold the lower area of the cowl cover to the wiper module.
3b. Disengage the quarter turn fasteners that hold the outer ends of the cowl cover to the wiper module.
3c. Open the hood and release the wing nuts that hold the front of the cowl cover to the wiper module.
3d. Close the hood but do not latch it. Now remove the outboard screws and lift the cover up enough to get to the washer hose.
3e. Disconnect the washer hose from the right washer nozzle. Close the hood but do not latch it. Lift the cowl cover toward the windshield and off the vehicle.
3f. Installation is the reverse of removal
4.Open the hood. Disconnect the wiper motor electrical connector.
5. Disconnect the windshield washer hose from the coupling inside the unit. Disconnect the drain tubes from the bottom of the wiper unit.
6. Remove the wiper unit mounting bolts. (Picture appears to be three (possibly allen head) bolts)
7. Remove wiper unit.
8. Installation is the reverse of removal. Wiper blade and wiper arm adjustment is measured with the wipers parked; correct adjustment is the lower wiper arm approximately 1.5 inches distance from the cowl cover and the upper arm approximately 2.5 inches from the lower arm. Operate the wiper motor and check that the wiper motor parks when the wiper switch is OFF.

Pivot Shafts and Linkage
The windshield wiper assembly is mounted below cowl top extension (021A36) . Linkages are connected with non-removable plastic ball joints. Windshield wiper mounting arm and pivot shafts are an integral part of the windshield wiper and are serviced as one unit. Removal

1. Disconnect the battery ground cable (14301). Refer to Section 14-01 .
   

1. Remove antenna mast from the antenna base.
   

1. Remove cap on LH and RH windshield wiper pivot arms to expose nuts retaining the arms to pivot shafts.
   

1. Remove two nuts, one from each of windshield wiper pivot arms . Lift wiper arms to service position, carefully rocking them back and forth to loosen them from the pivot shaft. Lift off windshield wiper pivot arms .
   

1. Remove seven screws retaining the cowl top vent panel.
   

1. Disconnect windshield washer hose (17A605) at LH side of vehicle just ahead of where it enters cowl top.
   

1. Remove hood cowl seal.
   

1. Carefully remove cowl top vent panel from vehicle.
   

1. Remove three retaining screws to cowl drain tube that is connected to top cowl.
   

1. Disconnect wiring harness leading to windshield wiper motor.
   

1. Remove five screws retaining cowl top to vehicle and remove cowl top and windshield wiper from vehicle.
   

1. Remove two screws and two nuts retaining windshield wiper to cowl top and separate the two parts.
   

1. Remove drive linkage from motor shaft linkage.
   

1. Remove remaining screws attaching windshield wiper and separate the two parts.
   

Item Part Number Description 1 02010 Cowl Top Panel 2 N621906-S2 Nut (2 Req'd) 3 17508 Windshield Wiper Motor 4 N805605-S36 Screw (2 Req'd) 5 17500 Windshield Wiper Assembly A — Tighten to 9-12 Nm (80-106 Lb-In)

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.