Lotus Elan

Window winder motor overhaul

PostPost by: englishmaninwales » Fri Apr 17, 2020 6:17 am

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Please be gentle with me, my own stupidity!
Ok, mea culpa. I dropped it whilst cleaning up the outside, and would barely work after :oops: It was working before removal.
See photograph of the post mortem, my first time inside one of these!
The main problems are:
One permanent magnet fractured into two pieces, one of the fragments is loose.
Broken plastic pillar contacts - looks old (I think this is the wiper parking contacts, disabled in this application with a cut black wire?)
Near solid gearbox grease.
Filthy, but apparently un-worn commutator.
50% worn brushes.
Bearings seem ok with minimal wear.
Gears seem in good condition.


A few questions please.
My research tells me this is a Ford Escort Mk1 wiper motor?
I was thinking of glueing the broken magnet fragment back in place. Best glue for long life - epoxy or suggestions?
What is the best gearbox grease?
I can ignore the broken pillar contacts?
Best way to clean up the commutator?
A quick look on eBay, I didn’t identify new brushes - anyone know of a supplier for these?

Apologies for so many questions.
Malcolm.
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PostPost by: 69S4 » Fri Apr 17, 2020 6:40 am

I've epoxied them back in place in the dim and distant past (on the basis of having nothing to lose) and the motor is still working.
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PostPost by: miked » Fri Apr 17, 2020 7:28 am

Malcolm,
They were from the Anglia and Mk1 Cortina. I have heard the Escort as a source but not sure about that.
I would have a go with expoxy glue for the magnet.
The wiper contact is of no consequence and only used for park duty. Not used in the Elan application. I always remove the extra wires when overhauling an ex wiper motor.
There are loads of generic brushes on Ebay. Measure and have a look. I recently did a heater fan motor and found 1/4 × 1/4 with side pig tail. The brushes were too long. Carefully cut and bedded with fine file and wet and dry.
I have none in bits, measure and let us know. If 1/4 × 1/4, i will look back to find.
The brushes are not that long. You can see that by the pigtail slot. Just make sure by putting the arrangement together and over the free comm to see how much gap there is from the pigtail to the end of the pigtail slot.
I would clean the comm first with brake cleaer and a little brush. Pick the solid carbon from the comm segments slots carefully with a fine blade. Then wash out again.
Re: comm surface, depends how good or bad it is. Easy to rag/mess up the copper. Most of the time I just clean with above. If marked a little, use wd40 and fine wet and dry paper. If you cut on a lathe it is quite hard to obtain a nice surface. Only done it when badly grooved.
Cheers Mike
Last edited by miked on Fri Apr 17, 2020 7:46 am, edited 1 time in total.
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PostPost by: vxah » Fri Apr 17, 2020 7:42 am

I have a spare motor that I could open up and take a magnet out of if needed?
I think I got it because the casing was damaged on one of mine, would need to do a little bit of checking first as none are back on the car yet so I wouldn’t want to cannibalise the wrong one!
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PostPost by: englishmaninwales » Fri Apr 17, 2020 2:03 pm

Thanks for the rapid replies :D

Mike - yes the bushes are 1/4 * 1/4” Looking at them fitted to the commutator I can now see I was a bit pessimistic on the wear, there is about 2/3 of the pigtail slot remaining, so I think they can just can be refitted.
Thanks for the advice on cleaning the commutator. Hopefully, when cleaned it’s not scored.
Edited to add: it was from BB’s manual that I got the Escort Mk1 source, but of course that wasn’t around in 1966.

VXAH - thank you for your offer, if you are able to cannibalise a complete magnet out of your spare casing I would be grateful, I’ll remove the broken half in my casing and epoxy in your complete magnet. I have sent you a PM about this.

Malcolm
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PostPost by: miked » Sat Apr 18, 2020 6:13 am

These are the brushes I bought Malcolm.

CARBON BRUSHES CASALS 13010 drills 2T13 2T16 2T162 2T192 2T232 PC352 TP352 S26

If you Google the line it comes up wth various companies selling them. I imagine there are different grades of hardness if looked into. They are quite soft but being what they are with their inherent slipiness i would imagine they last a long time. If you do buy any and cut be careful as they are very easy to cut and dress.
Saying that I used to fit and dress very large brushes for colliery winder motors (and other DC motors) and they too were very soft so i am not up on this carbon hardness business save that the brushes are meant to be the consumabls bit and not the comm'.
:lol:

:D
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PostPost by: englishmaninwales » Sun Apr 19, 2020 9:16 am

Thanks Mike, that’s very helpful.
Malcolm
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