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Author Topic: 1992 K75s Radiator Fan Gave Up The Ghost Question.  (Read 3584 times)

Offline ExpatAussieBrick

  • Motobrick Curious
  • Posts: 42
1992 K75s Radiator Fan Gave Up The Ghost Question.
« on: January 22, 2020, 01:10:22 PM »
 :redk75s_trans_p_25:

Hey brick boys and girls I have a quick question regarding replacing my fan but first a bit of back story.

The other week as the temperatures were unseasonably warm in NYC my poor bricks fan decided to promptly crap itself as it turned on for the first time in a few months. I remember riding and smelling something that was a bit like burning plastic but thought nothing of it until I got home and realised my temp warning light was on. Upon getting home I turned the bike off let it cool a bit then turned it on again let it idle until the temp warning light came on again with no fan starting up. I then attempted to spin the fan blades and although they did spin they did not do so freely with quite a bit of resistance.

Temperatures are back down again so I have been riding around with no fan and haven't had overheating issues again yet. The coolant in the radiator was replaced in June 2019 and the expansion tank reads almost full.

I did some research and my question is should I attempt to repalce just the motor of the fan with this?
https://www.euromotoelectrics.com/BMW-Motor-Radiator-Fan-K-models-1983-1995-p/fan-k427m.htm


Bearing in mind it does state that it would require getting the old fan blades off and then crimping or soldering the new wires to the connector. Which I have never attempted anything like before. So I don't know if that's an easy job or not.

Or should I replace the whole fan with this unit
https://www.amazon.com/dp/B003PB44TO/?coliid=I7NRBC95YKZN5&colid=1VMDBJKVIPX4B&psc=1&ref_=lv_ov_lig_dp_it

Does this fit fine? I did some research on the fan model but would this also require soldering the new wires to the old connector.

One last thing is before I do one of these I guess I should pull the fan off and try running power to it from the battery? To confirm 100% that it is dead.

How difficult is removing the top fairing on the S model to access the radiator? I have not had to pull the top fairing off yet.
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  • Sydney Australia
  • Bluebottle Blu 1992 BMW K75S

Offline The Mighty Gryphon

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #1 on: January 22, 2020, 01:57:34 PM »
Whatever it takes to get to the fan do it.  You have two months of shit weather so you might as well.

I went with the Spall fan.  It's a much better fan than the Bosch that came with the bike.

Here is a thread on easily retrofitting the Spal fan to the brick.  If you have an 80 grit sanding disc and a pop riveter it takes about an hour after the old fan is removed from the radiator.

Here is the link to the procedure I used when I replaced my fan that had totally melted it's brush holders.  Go to reply #18 December 20, 2014  There is a good description and nice pictures.

http://www.motobrick.com/index.php/topic,4313.0.html

As long as you have the radiator off the bike take the opportunity to flush it inside and out.  There probably is a lot of bugs plugging up the cooling fins.
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  • In my garage in Marilla, NY
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Offline ExpatAussieBrick

  • Motobrick Curious
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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #2 on: January 22, 2020, 02:07:03 PM »
Good points thank you for the links.

Guess I will give the spall fan a go and do the job on the workbench in my apartment once the radiator is off.

Cheers mate.

Will post up once I begin the job.
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  • Sydney Australia
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Offline Laitch

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #3 on: January 22, 2020, 10:51:43 PM »
Quote from: The Mighty Gryphon on January 22, 2020, 01:57:34 PM
Here is the link to the procedure I used when I replaced my fan that had totally melted it's brush holders.  Go to reply #18 December 20, 2014  There is a good description and nice pictures. http://www.motobrick.com/index.php/topic,4313.0.html
The photos of that thread's December 20 post are victims of infamous Photobucket unreliability; however, Gryph's text is concise and in fuzzy photo #2, the location of one of the cuts in the perimeter is visible so you should be able to complete the project using that post as a guide.

Other approaches are here.
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Offline stokester

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #4 on: January 23, 2020, 09:38:41 AM »
I found the solution at https://www.tills.de/bmw-k75-67/cooling/
It's a quality setup using a Spall fan with the proper connector and nice mounting bracket.  Quick shiipping.
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Offline Laitch

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #5 on: January 23, 2020, 12:13:43 PM »
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  • Along the Ridley in Vermont.
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Offline mw074

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #6 on: January 24, 2020, 05:58:29 PM »
I have a good used fan assembly. Tested. $40. + shipping. Email me.
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Offline ExpatAussieBrick

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #7 on: January 25, 2020, 01:03:57 PM »
Quite the bargain.

Looks like I would need to crimp or solder those wires onto the connector.

What crimping tool do people use?

When it comes to electrics I pretty much have zero knowledge.
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  • Sydney Australia
  • Bluebottle Blu 1992 BMW K75S

Offline mw074

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #8 on: January 25, 2020, 01:54:56 PM »
I probably have the correct connector. If so, I will splice it on.
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Offline mw074

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #9 on: January 25, 2020, 03:06:31 PM »
  " What crimping tool do people use? "

Depending on the type of connector, I use Amp, Waldon, or my favorite, T&B STA-KONS.
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Offline johnny

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #10 on: January 25, 2020, 03:56:54 PM »
greetings...

i prefer wiss...

posi


* 1312339.jpeg (14.32 kB . 456x456 - viewed 509 times)

j o
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Offline billday

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Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #11 on: January 25, 2020, 05:45:34 PM »
You can git 'er done with a pair of pliers.
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Offline Soggz

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  • 2 wheels are better than 4,but 4 wheels,2 bikes...
Re: 1992 K75s Radiator Fan Gave Up The Ghost Question.
« Reply #12 on: January 27, 2020, 04:37:20 AM »
I did mine. I used the spall and original surround.
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