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27th March 2022, 17:48 | #31 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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I'd certainly have a go at cleaning up that copper track and soldering in a length of thick wire. You've got nothing to lose! Your 3 wire motor has given extremely good service and can continue to do so. The resistor system introduces unreliability. The two exposed brushes have loads of life left in them. Can you coax the other shy two out of hiding in their holders and photograph them? Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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27th March 2022, 21:07 | #32 | |
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Thanks for the encouragement! I feel like I could clean it up fairly well and I have got four new brushes ready to go in. My main thought was that I didn't fancy putting the car back together and then having to take it all apart again in a few months if the repair fails. I'll have a go at cleaning the board up tomorrow and take some more pictures - you're right that there's nothing to lose! |
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28th March 2022, 19:53 | #33 |
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Here's a picture after I've cleaned up the board with all four brushes, you can see the one which was broken in the top left.
I've been trying to reattach the broken strip, I thought I might be able to solder the break back together but it doesn't seem to want to adhere. Forgive me if this is a stupid question, but would it not achieve the same result if I put in a wire between the two solder point like so: |
28th March 2022, 20:13 | #34 | |
Doesn't do things by halves
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You're doing a great job! I can't recall anyone repairing a 3 wire 2 speed motor before. In your first photograph, the brush at the bottom of frame looks the most severely worn, closely foillowed by the brush at the top right. I'm interested to find out to which colour wires these are attached. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 28th March 2022 at 20:16.. |
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28th March 2022, 21:25 | #35 | |
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29th March 2022, 18:42 | #36 |
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Here's my progress this evening. I soldered in the wire bypass, I took the inner cable from some three-core mains plug wire which I'm sure will suffice. I was able to get a bit of solder to stick the broken part, just for good measure and then covered that with some hot glue.
Also, all four new brushes are in, two of them were fine for a bit more use but in for a penny, in for a pound! The four brushes seem to be wired like this: 1 - Black 2 - Red 3 - Purple 4 - Connected to brush 2 It was 1 and 4 that were the most worn. Make of that what you will! Hopefully I'll get time tomorrow evening to put the motor back together and see if it's all working. |
3rd April 2022, 17:42 | #37 |
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I had good success with the fan, it is now working at both speeds and the front of the car is all back on after a faceless week. I recorded a little video to show it working at the two speeds.
As expected, though this absolutely needed doing first, it hasn't miraculously fixed the air conditioning so my next step towards fixing that will be to call out an A/C specialist to have a look. Here's the fan board back where it belongs: Here's the video of the fan working, you can hear it get faster when I put the paperclip in: And here she is after I cleaned a week's worth of bird poo off: Last edited by JefferiesFarnol; 3rd April 2022 at 17:49.. |
4th April 2022, 06:29 | #38 |
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Well done that's great work
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4th April 2022, 08:07 | #39 | |
Doesn't do things by halves
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Yes, well done Hector. You've saved yourself a shed load of money there and have a fan on which you can rely for many more years. It's been a great pleasure to assist you. Simon
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4th April 2022, 09:41 | #40 |
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Hi Hector.
Excellent work carried out by you to fix the fan, i was at one stage going to contact you to say i had a spare, did you replace the shannon tube? if not a link below for the ducting which is 70mm https://www.ebay.co.uk/itm/202755398...r=502979312615
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Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise " |
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