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Wiper motor

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The wiper motor has finally failed and is burnt out. On taking the motor out this morning I have a little question to ask. Can you pull out the cable rack from the Rigid tubing or is it a full stripdown as it is tight to move in and out approx 1/2 inche.

Mike Redrose Group 

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mike

if you undo the nut that holds the piping to the motor ,you can pull the drive out of the tubing , make sure you remove the wiper arms !!!!  when re fitting push the drive as far as the first wheel box then turn the wheel box to engage the drive , repeat when you get to the second box , .

graham

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Thanks for that Graham I’ll give it a go, but it was very tight. If and when I get it out is there a lubricant I can put in the tubes.

Mike Redrose Group 

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Hi Mike,

before pulling the cable out -

mark the wiper arm spindles (draw a vertical line across them) - rotate the spindle 120' before refitting

Remember the orientation of the cable in the motor. - rotate the cable 180'  before refitting.

The above will use unworn parts of both parts (assuming they hadn't already been turned over).

Use a fairly light grease that doesn't go too stiff in cold weather.

There is a pulling tension test outlines in the WSM on the rack cable.

 

If you are not a concourse advocate then seriously consider the TR6 14W motor.   These are cheap and plentiful and work very well. 

 

Roger

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Mike,

All as above but before you can withdraw the rack you will either need to pull it out whilst still attached to the motor or remove the cover off the motor to disconnect the rack from it.

Graham

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Hi Roger

Converting to a TR6 wiper motor is something I have been considering no doubt many others, could you be persuaded to write an article for TR Action explaining how to mount it and the wiring and other changes involved.

Cheers Chris

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19 hours ago, RogerH said:

Hi Mike,

have a read of this to see how to make changing a wiper motor exciting.  

Roger

Hi Roger, Interesting topic referring to replacing with TR6 motor. Will a 152 degree sweep cause a problem on a 4A do you think?

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Hi Roger,

very much so.

The standard sweep is apprx 120'.  

If you go over tot he 14W motor then you have to start from te beginnning to see what gear wheel you need.

The standard TR6 f=gear wheel 115' but that is with TR6 wheel boxes.

 

I have found that with the standard TR4A wheel box a 95 or 90' gear wheel works well - with added bonuses.

 

Roger

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Just spent a happy two hour getting the cable rack out, full of old grease and dirt. Found out why the motor has burnt out the drivers side wheel box cannot be moved with fingers and very stiff with wiper arm on. Removed from car and cleaned still very stiff so ordered two new ones, also found that the live cable from the lng switch has burnt out ( no fuse to wiper motor another job to do) so if you have not looked at you wipers for a while, I have found you a winter job before it costs you.

Mike Redrose Group 

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Hi Mike,

to add to your above comments.

If you have a normally working  2 speed motor (DR3 I think)  and it jams on the screen before it self parks you will burn out the high speed over winding (resistor) and possibly the

armature as well

The motor will continue to draw current until it burns out - hence the burnt Ignition switch wires

Simple way around this is to remove the self park facility but annoying.

 

Roger

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A word of warning re replacement wheel boxes Mike. It's highly unlikely you have acquired original NOS Lucas wheel boxes. Be aware that due to poor dimensional control on some repro items it was possible for the rack to come out of mesh with the gear wheels under high torque. Before fitting reproduction parts to the car test them carefully. Fit the rack in a wheel box and then clamp the spindle carefully in a vice to avoid any damage to the splines. Next grip the drive end of the rack with a mole wrench and exert considerable force to ensure that it will not come out of engagement with the pinion at high torque. This can happen, don’t ask me how I know! If the rack does ride over the pinion then separate the two halves of the wheel box and carefully reshape them so that the rack is held in closer contact with the pinion without binding. Repeat the exercise on the second wheel box and pat yourself on the back for having potentially saved yourself a lot of grief!

Tim

Testing Wheel Box.JPG

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All getting very complicated - but I have found a solution............................ not taking car out when it's raining! :rolleyes:

Edited by rogerowen

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Evening all ,   Just had a few hours in the garage installing new wheel boxes and new motor. Wired up temporarily two speed switch to test and get the stop and park working. Next is to replace burnt out wire in the loom (that will be fun ) hopefully do that job mid week ready for going out over the weekend.

Mike Redrose Group 

 

434700E1-720D-4746-87F1-17B064BBDBA4.jpeg

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Well done mike. I admire your electrikery dexterity.

 

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