This a question re a DIY repair to my desktop PC AMD processor air cooled CPU heatsink fan.
So the CPU fan stops turning (I have a small utility installed that shows in sys tray the temp of each of the 4 processors).
For a while I was able to manually flip & turn the fan blades (which meant taking the side cover off the PC) so that they would, with enough flips, spin fast enough to keep the temp down; that work-around stopped working (not to mention that it got real old having to do that).
I did the usual YouTube re fan repair (CPU and other types), and discovered that there are various ways that the fan, and its shaft (rotor), are attached to the fan housing (I figured maybe all that it needed was a good cleaning); anyway since the fan had stopped turning, I figured a homemade repair couldn't ruin anything that wasn't working at all. Well it turned out that the blades, and its rotor shaft, were simply forced inserted inside the fan housing, i. e., it just popped in (and of course out to remove it). Obviously a top of the line premium item.
But sooner or later (more like sooner), the fans slows down and then stops (including not starting when I turn the PC on). Over the succeeding weeks I have tried a variety of lubricants (to coat the shaft/rotor), and they all work rather well (as in like new as evidenced by the temp utility)--for a while. I have no idea why their life "span" is so short, i. e., the system is not overheating. I have tried sewing machine oil & garage door silicon lubricant (and yes I gradually increased the quantity that I was applying). Given the short term nature of my results, I'm ready to try grease. By the way, I don't think that there is any real danger that any lubricant that I use will catch on fire (I'm using tiny amounts).
I'm wondering about using the kind of grease that's used to lubricate a car's suspension (that pretty thick stuff that car shops used)--BUT there are all kinds of grease in use in the real world (such as petroleum jelly)? Any alternative ideas to car grease?
Final note: there are NO ungodly noises being make by the CPU fan when it's running, i. e., based on the lack of noise, I don't think that I have an 'unbalanced' shaft & that's the real reason why the lubricants aren't lasting very long.
I would hazard a guess that although you said it is cool running the friction on the spindle is creating heat so suggest you need high temperature grease.
I used to have a great auto mechanic who insisted lithium grease was best for durable, high temperature applications.
Silicone grease is often used in dielectric applications (e.g. to put a little on your spark plug wire ends for better conductivity). If there was any chance some would get out of place, that could be a reason not to use silicone.
Hmmmm. Why is it "silicone" and not "silicon" in the articles I checked before posting?
For the amount of money spent on grease, etc, would it not be much cheaper just to replace the fan?
Make and model of the PC, better still, the MOBO would go a long way towards sorting you. CPUs are fairly generic, as is most cooling, unless it's a "supermarket" PC built to a size and budget.