Post by: ExpatAussieBrick on January 22, 2020, 01:10:22 PM
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
(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 (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.
Post by: The Mighty Gryphon on January 22, 2020, 01:57:34 PM
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.
Post by: ExpatAussieBrick on January 22, 2020, 02:07:03 PM
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.
Post by: Laitch on January 22, 2020, 10:51:43 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 (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 (http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/fans/fans.htm).
Post by: stokester on January 23, 2020, 09:38:41 AM
It's a quality setup using a Spall fan with the proper connector and nice mounting bracket. Quick shiipping.
Post by: Laitch on January 23, 2020, 12:13:43 PM
I found the solution at https://www.tills.de/bmw-k75-67/cooling/ (https://www.tills.de/bmw-k75-67/cooling/)112350
Post by: mw074 on January 24, 2020, 05:58:29 PM
Post by: ExpatAussieBrick on January 25, 2020, 01:03:57 PM
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.
Post by: mw074 on January 25, 2020, 01:54:56 PM
Post by: mw074 on January 25, 2020, 03:06:31 PM
Depending on the type of connector, I use Amp, Waldon, or my favorite, T&B STA-KONS.
Post by: johnny on January 25, 2020, 03:56:54 PM
i prefer wiss...
posi (https://www.posi-products.com/positite.html)
1312339.jpeg (14.32 kB . 456x456 - viewed 785 times)j o
Post by: billday on January 25, 2020, 05:45:34 PM
Post by: Soggz on January 27, 2020, 04:37:20 AM