75ZT Community

Hi
I recently changed my none working 3 speed fan to a 2 speed fan, having finshed the job, today i decided to have a look at the bushes inside the motor of the 3 speed fan i had taken off and boy did i get one big surprise the plate inside had disintergrated, also 3 of the springs which work the bushes as they wear down had become so week they no longer pushed the carbon bushes forward to contact the motor no wonder it failed this must have been like this since i purchased the car as i have only done about 800miles in the car since i brought it in Oct 2010.

I wonder how many other cars out there are in this state unknown to the owner if they are not this bad and only the springs have failed that to would stop the motor from working surely.
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Note how this as rotted away pic 3
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pics 6/7 is the other side also rotting away.
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Pic 8 shows the bushes and their springs note from left to right how the first one as no spring must have disintergrated or fell out, second and third springs failing to push the bush forward fourth is still strong and working as it should.
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pic 9 shows the bushes have all worn the same length approx so it must have been the springs that failed burning out the motor thus helping to rot the plate on which they fit.
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All bushes are approx the same but to be 100% from left to right are 18mm 19mm 21mm 21mm so i would think the 18mm would have been the low speed bush yes ?
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What are the opinions of those in the know about this please. If any cheers Arctic.

Opinions? It is knackered!

'They all do that sir'

That said, the one off the 1.8 I broke had done 65k miles, was ten years old and the motor was like new....

Good job you got a new one...

hI Zeb.
So would you say it is the springs that fail first as there seems to be enough meat left on the bushes and if so would it be better to change them as soon as the fan stoped at low speed or is it just best for other members to go for the 2 speed,

Somebody will be able to make use of those brushes to repair another.
I went straight for a two speed when my slow speed stopped, that was at about 20K miles. I did get avery good deal on it though from a very good friend, which made it the sensible choice at the time. The two speed with Jules resistor should last the life of the car.

I would be inclined just to go for the two speed myself...but then what do I know...my 190 has a Kenlowe...

Mick wrote:Somebody will be able to make use of those brushes to repair another.
I went straight for a two speed when my slow speed stopped, that was at about 20K miles. I did get avery good deal on it though from a very good friend, which made it the sensible choice at the time. The two speed with Jules resistor should last the life of the car.

Hi Mick
they are more than willing to have them jus drop me a PM anyone whom wants them FOC posted FOC

Just shows how a manufacturers reputation can be harmed by its parts suppliers.

With the fact that 3 speeders will go with eventually some with very little mileage the black mark goes against Rover and not the motor manufacturer

My car has done 130k but from the look of this motor it may have gone a long time ago as i have only done 800miles since i purchased the car last october 2010, and it seems the springs have gone weak so not pushing the brushes forward then its burnt out, poor design would you say ?

Another German company...............

JohnDotCom wrote:Another German company...............

Well, stripped a couple today, and interesting results. These are both V6 versions, but the fan is the same. It's only the control box that varies.

The first came off my own car, and speed one was dead. It was replaced with a new three speed while they were still a sensible price. As expected, one brush completely gone, a second worn a bit, the other two quite good. Commutator a little worn but nothing to worry for.

The second was donated to me to strip for spare brushes. Now before I started to strip it, I turned the shaft and found it very stiff. The brushes turned out to be pretty much the same, but appeared to be sticking. So I think that in the OPs post, it isn't the springs losing their force, but the brushes sticking. The connecting braids were stiffer than inthe first motor, and it might be this. Now, the motor had overheated, not as badly as Artcics, but I think this caused the sticking brushes. So why was it sticking and overheating? Well one of the permanent magnets had broken free. Not a result of my dissasembly, because it was sticking before I started. No signs of damage that could have caused it either.

So I have enough parts to rebuild one and a bit motors (I bought some spare brushes). Arctic, if you want the brush plate, and some brushes to go with your decent armature (assuming it is OK), we could probaly make a second spare.

Jürgen wrote:

JohnDotCom wrote:Another German company...............

You may well ask............................. maybe not JDC though, you know what he's like.

So I have enough parts to rebuild one and a bit motors (I bought some spare brushes). Arctic, if you want the brush plate, and some brushes to go with your decent armature (assuming it is OK), we could probaly make a second spare.

HI Duncan.
Thanks for the offer but sadly the armature was thrown away not by be i might add but a certain person whom goes unnamed and thinks i hog to much stuff as it is, even though i know that all things come in handy one day or another,

JohnDotCom wrote:Another German company...............

Which part of Germany is Canada in?

Duncan wrote:

JohnDotCom wrote:Another German company...............

Which part of Germany is Canada in?

Not all plans come to fruition - it vill next time

Mick wrote:

Jürgen wrote:

JohnDotCom wrote:Another German company...............

You may well ask............................. maybe not JDC though, you know what he's like.

Don't worry, I'll be cautious!

Duncan wrote:

JohnDotCom wrote:Another German company...............

Which part of Germany is Canada in?

Hmm, must be the far, far, far northwest then. And they speak in a strange dialect or two ...