wipe motor overheating

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renorenoreno

Member
Posts
59
hi guys i recently changed the wiper motor on my 2a. Discovered that the motor will stop working after 5mins of constant usage(fuse did not blow). The wiper will continue to function after around 10mins of letting it cool off. The wiper wipes at an average pace hence i conclude the fault to be either the motor itself or relays/diodes. It is possible to add a resistor to slow down the wipe speed so the motor will not overheat as fast?thanks alot!
 
I've had to regrease these in the past. The grease gets harder over time in the motor, gears wiper bushes and the cable all adding up to it either seizing and doing the motor in or the cable snapping. Yours is maybe due a strip down, clean out and rebuild.
 
If this is the little Lucas motors you can safely assume that the grease is concrete. The original grease in this turns hard as a rock over to e and packs away from the gears.

Pull it apart, strip out the shafts and clean all of the bores thoroughly. Use a good quality synthetic grease and don't over pack the gearcase and you will be much more pleased with their operation.

Another thing to check is the brushes and their contacts. If worn you may be getting intermittent contact to the commutator causing lack of drive and spiking the current draw on the field. Clean the commutator and make sure the brushes are reasonably unworn.

Ajr
 
I've now fully refreshed my memory on this. As part of my project rebuild bulkhead strip down I rebuilt the wipers and motor last night. It took me a few hours (along side the usual tool hunting and fag breaks). I found this one had already been done at least once as there was some rock-solid original grease followed by some brownish grease and what looks to be some moly greases in the slider mechanism.

Striping down and rebuilding is fairly straight forward though watch out for washers and remember where they go on all the wheels and if you decided to dismantle the motor watch out for the ball bearing on the back of the armature...

One question for the more experienced. The wheel boxes that connect to the wipers themselves. The two nuts that hold them together, should they have lock washers or something as you really don't want them to come undone but over-tightening them makes them bear heavily on the wheel and cause it to bind....
 
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