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Nov 20, 2005, 09:55 PM
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cessnajfb's Avatar
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Do you lubricate your bearings? (brushless motors)


I have two brand x outrunner brushless motors. One bearing went out (became difficult to turn) on my first motor and today a bearing on my second motor started whining. I re-read the literature that came with the motor and sure enough under motor maintenance it says to lubricate the bearings regularly with light oil.

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Nov 20, 2005, 09:59 PM
X-Era Motors
DavidB.'s Avatar
I use straight motor oil. Costs almost nothing and I've never had any problems. Some bearings actually come with grit in them. These should be cleaned before oiling or you'll just have an abrasive stew swirling around in there. A clean lubed bearing will last a long time.
Nov 20, 2005, 10:20 PM
Registered User
If it's gritty feeling, or seems locked up, try disassembling it and soaking it in gasoline... or turpentine. If you aren't able to disassemble it, just soaking it will sometimes un-freeze a locked bearing. With it apart, if any of the balls are funny looking, it's beyond repairing. After the soaking, lube it up, and it should be good to go. I use r/c motor cleaner to blast out the dirt on my truck bearings, it's about $3 a can, which will clean a bearing 1000's of times. I also use a trinity-made bearing lube or snakeoil on mine, but never tried regular motor oil...if it works, big difference in price. $2 a quart vs $8 for 2 oz...worth a shot once my supply runs out. Biggest thing to remember is just a SMALL drop is enough...too much will attract dust/dirt and mean cleaning more often. In a plane it's pretty moot unless you fly off a baseball field or something, though.

Todd
Nov 20, 2005, 10:28 PM
X-Era Motors
DavidB.'s Avatar
Motor oil is great, but I've also used air conditioning oil which I believe has less additives. One thing not to use is WD-40, it will evaporate and leave nothing behind. The oil needs to be viscous enough to remain in the bearing.


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