Windshield Wiper System - Description Tips
83jaguar01Date January, 1983
ITEM: J83/01
MODEL: XJ6 Series III and Vanden Plas
SUBJECT: WINDSHIELD WIPER SYSTEM
When investigating problems associated with the wiper system, attention should be paid to the specific areas and items detailed below, working in conjunction with Operation No. 84.15.12 of the Service Manual.
NOTE: Where greasing the wiper system is referred to, a light grease such as Quaker state Multi-Purpose Lithium N.L.G.I. No.1 or similar should be used.
FIGURE 1:
WIPER MOTOR REMOVAL
Disconnect and remove the battery.
Carefully remove the wiper arms and blades from the wheelbox spindles, avoiding excessive levering.
Remove the hood pull bracket nuts and bolts, Fig .1 - (1) .
Remove the wiper motor cover.
Disconnect the cable rack conduit from the motor, Fig.1 - (2) .
Remove the two retaining nuts and washers from the motor clamp, Fig .1 - (3) .
Tilt the motor towards the engine and disconnect the harness connectors.
Remove the motor and drive as a complete assembly, drawing the rack drive from the conduit.
WIPER MOTOR REFIT
Prior to installation of the new motor, ensure that the rack is adequately greased. When refitting, insert the rack into the conduit avoiding bending the rack excessively. It may be necessary to turn the wheelbox spindles to enable the rack to fully enter the conduit.
IMPORTANT: Prior to securing the wiper motor assembly, ensure that there is no excessive friction through the conduit and wheelbox assemblies. To determine this, manually traverse the motor/rack assembly through the conduit. This is most important in the case where wheelboxes are replaced. Prior to rack installation the wheelboxes may also be checked for excessive friction by manual rotation of the appropriate spindle.
In the event of replacement ensure that the wheelbox(s). are secured to the conduit sections prior to the motor/rack fitment. DO NOT SECURE WHEELBOXES WITH RACK INSTALLED as damage or overloading of the rack, and subsequent motor failure may occur.
FIGURE 1:
Ensure that the ground point adjacent to the wiper motor, Fig.1 - (4), is clean and the harness terminal is secured correctly.
In the event of a failure occurring with the wiper system which necessitates the replacement of the motor, windshield wiper blades must be checked to ensure that the blades are not worn or damaged. If they are not serviceable, then they should be replaced and charged to the owner in the ususal way.
WIPER SYSTEM NOISE
NOISY WHEELBOXES
Noise from the wiper wheelboxes fitted to the above model ranges is usually due to excessive end float of the wheelbox output shaft.
End float can only be altered when the wheelbox output shaft is subjected to considerable end pressure, for instance, when refitting or replacing a wiper arm.
To correct excessive end float, the following procedure should be followed with the wheelbox in situ, using an oversize spacer washer of approximately .375" thickness, with an internal diameter of .375".
FIGURE 2:
PROCEDURE
1. Remove wiper arm from spindle.
2. Place spacer washer, Fig.2 - (1), on the spindle.
3. Replace the fixing nut and tighten the nut until the collar is re-positioned on the shaft so that a .003" feeler gauge can be inserted between the wheelbox body and the collar.
4. Remove the spacer washer and refit wiper arm. Do not overtighten the fixing or hammer the wiper arm down onto the taper when refitting or replacing an arm.
NOTE: Before changing wheelboxes for noise, this procedure MUST be carried out; always ensure that wheelbox assemblies are adequately greased prior to installation.
FIGURE 3:
LINKAGE NOISES
Linkage noise may be caused by incorrectly aligned conduit tubing; if this is suspected, check:
1. That the conduit sections and wheelbox housings do not foul the vehicle bodywork.
2. That the conduit section between both wheelboxes is fitted correctly. This section has a slight curve which should follow the line of the windshield, see Fig. 3.
3. If the motor/rack assembly is withdrawn from the conduit, always inspect the rack for any excessive burring of the coil, wear characteristics, or kinks.
4. Check that wheelboxes are secured correctly to the bulkhead, undue movement during the wiper operation can cause excessive noise and possible damage to the rack.
FIGURE 4:
WIPER ARM POSITIONING
To ensure that windshield wipers perform correctly, it is important to ensure that the wiper arms and blades are fitted and positioned in accordance with the following dimensions - See Figure 4. The inset 'A' - Fig.4 indicates inner blade support where measurements should be taken.
Prior to checking/positioning the arms/blades, ensure that the system is parked on a WET windshield.
WARNING: Incorrect adjustment of wiper arms may cause blades to lock together under certain conditions.