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Old 11-07-2008, 06:50 PM   #1
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Default Brushless Motor Bearing Removal

I've heard racers discuss replacing the standard bearings in brushless motors with high performance bearings. What tricks do y'all have to remove the bearings? I have a mod motor that needs a bearing or bearings replaced, but I'm hesitant to just start banging on the bearings to get them out. Do you need a torch? Or will a heat gun do? Are there different procedures for different motors?
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Old 11-07-2008, 06:58 PM   #2
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My only experience doing this was the bearings almost fell out of the motor without any real effort on my part. I was replacing the bearings in an LRP 3.5T with ceramics and both bearings came out with just a little pressure.
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Old 11-07-2008, 07:14 PM   #3
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Originally Posted by mok View Post
My only experience doing this was the bearings almost fell out of the motor without any real effort on my part. I was replacing the bearings in an LRP 3.5T with ceramics and both bearings came out with just a little pressure.
Did you see any performance gain?
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Old 11-07-2008, 07:28 PM   #4
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Just to avoid anyone who feels the need to flame (not you PNGordie, but just in case) I am replacing the bearings because I can hear the ones in the motor squealing and this is after I tried oiling them. I can feel the rotor dragging . . .
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Old 11-07-2008, 07:31 PM   #5
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On my Hacker 17.5 the bearings just fell out with a little tap. The tolerance on the parts is very loose. I am not sure about others. If the bearing is already bad, just put a screwdriver on the inner race and just bang it out. On good bearings you should never touch the inner race.
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Old 11-07-2008, 07:49 PM   #6
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Use the muchmore bearing removal tool, works great.
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Old 11-07-2008, 07:59 PM   #7
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Did you see any performance gain?
the motor did sound smoother but i was not convinced any performance gain came from it.. it might have brought temps down a little on the motor side of things, but it didnt give me that extra lap i was looking for
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Old 11-07-2008, 08:08 PM   #8
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I wouldn't worry so much as a performance gain, but a bad bearing grenading on you while racing. I can imagine that would damage the motor...
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Old 11-07-2008, 08:12 PM   #9
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http://www3.towerhobbies.com/cgi-bin...?&I=LXVFW2&P=7

That was easy.

Anyone else have any experience with this little guy?
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Old 11-07-2008, 08:46 PM   #10
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If you are working on a Novak motor they don't recommend replacing the bearings because they are glued in the aluminum endbell. I found the way around that was to put pressure on the bearing with the bearing removal tool (like the one noted above) and then with the bearing tool held in a vise, heat the endbell with a heat gun. The aluminum expands more than the steel bearing and when the glue bond breaks you can hear a "pop" and the bearing comes out easily the rest of the way.
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Old 11-07-2008, 11:22 PM   #11
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Sweet. Thats exactly the kind of information and experience I was looking for. Thanks y'all.
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Old 11-08-2008, 10:20 AM   #12
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Here is a tool by Hyperdrive to remove and install the bearing. I tried it it; works great. No heating neccesary.

http://www.lefthander-rc.com/catalog...oducts_id=1378

When reinstalling the bearing I use a high temp red Loctite to glue the bearing back in. Motors sometimes get too hot for the standard grade of red loctite.
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Old 11-08-2008, 11:57 AM   #13
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Quote:
Originally Posted by andrewdoherty View Post
I've heard racers discuss replacing the standard bearings in brushless motors with high performance bearings. What tricks do y'all have to remove the bearings? I have a mod motor that needs a bearing or bearings replaced, but I'm hesitant to just start banging on the bearings to get them out. Do you need a torch? Or will a heat gun do? Are there different procedures for different motors?
with the Speedpassion motors I use the eraser side of a no.2 pencil, works great!!
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