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Old 03-08-2008, 03:58 PM   #1
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Default How do I replace the front and rear main bearings?

RC Tech, I have Novarossi 21-5k that I want to replace the front and rear bearings in and I have read various methods for doing this, but don't know the best way to go about it...can I get some input from the collective on this process, the best way to do it, is it worth upgrading to ceramic bearings...give me your thoughts. Thanks everyone for your input!
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Old 03-08-2008, 04:33 PM   #2
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Front bearing is pretty easy just heat it up a little with a heat gun and pop it out the rear one is the tricky one.
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Old 03-08-2008, 05:03 PM   #3
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I did the same thing to my 21-5k not too long ago.

Pre-heat the oven to 400 degrees and put the engine in for about 10 minutes. The front bearing will fall right now and the rear should come loose really easy now as well. The only problem is to get the rear bearing actually out of the crankcase. I ended up putting the crankcase in the freezer overnight and I was able to get the rear bearing actually out of the case.

I hope that helps.
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Old 03-08-2008, 08:26 PM   #4
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Heres the answer to all r ?/s

http://www.rbproducts.com/mainEn.php...ille=DIV&go=go

Bearing Extractor 11.5/12.0/13.0/14.0/14.2

Reference : Designation :
01400-00001 Bearing Extractor 11.5/12.0/13.0/14.0/14.2

Available since: 05/08/2006


Gain time and efficiency while taking off the main bearing of your racing engine with this bearing extractor ! So far you had to heat the crankcase and force it a bit to extract the bearing. As of now you will only have to simply use this brand new tool into the crankcase. The special plier available in various diameters will block the bearing. Then squeeze the key and take off the bearing only by screwing the RB gold orange handle. It is very easy-to-use and with no risk of damaging the bearing or the crankcase. RB : high- performing tools for the R/C competition world.
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Old 03-08-2008, 08:50 PM   #5
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if you go with ceramics contact Peter at TKO, they have an new design rear bearing for the .21-5 series NR engines= no rear bearing issues for the 21-5 engines
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Old 03-08-2008, 09:15 PM   #6
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have you tried the new 14.5x26mm bearing from tko yet ?? tried to fit one in a plus 2 367 case today and the bearings outer dia. is just a couple microns too big ! the outer race actually squished the ceramic balls to the point of making the bearing hard to roll = bad the boca stainless bearing went into the case without issue by the way , so hopefully the issue will be addressed as i really want to find a good ceramic bearing for my plus engines

and as far as changing bearings , if you dont know what you are doing it is a good idea to either send it to somebody who is well practiced at it or find someone you know locally that is good at it and pay attention
i can do it for 15 $ service fee +bearing cost and shipping , and yes i am very good at engine service


later ,
monty


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Old 03-09-2008, 07:37 AM   #7
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Quote:
Originally Posted by mugenb46 View Post
if you go with ceramics contact Peter at TKO, they have an new design rear bearing for the .21-5 series NR engines= no rear bearing issues for the 21-5 engines

Mugenb46, these are the tko bearings I am going to go back with for my 21-5k

-"NEW" 07 TKO Ceramic Front Crank Bearing
[CB-607C-2RS]
- TKO New 2008 Ceramic Rear Crank Bearing 14.5 x 26 x 6
[CB-MR26145]

Are these the ones you used? Also, should I replace the conrod as I now have three gallons on the motor? If fills great but the popular consensus seems to be that you replace the con rod at three gallons just to avoid any kind of catastrophic failure? Thanks everyone for the input!
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Old 03-09-2008, 07:57 AM   #8
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I would there not expensive and if it breaks than your engine is toast.
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Old 03-09-2008, 10:08 AM   #9
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yes , those are the bearings i tried to put in the plus block . the rear bearing was too big on the outer diamater i am not bashing tko products in anyway i am just trying to save you guys some hassle and problems i will be the guinea pig for ya
happy running guys ,
monty
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Old 03-10-2008, 08:43 AM   #10
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TKO stands behinds our products. Please return the bearing to us for inspection and a refund. Always call or contact us with any issues.
704-562-3535
pmtko@carolina.rr.com

TKO Competition Development
8964 Saint Croix Lane
Charlotte, NC 28277

We tested the bearings in customer and engine builder engines before release
so we are concerned about your results.

Thank you,
Peter Martin
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Old 03-11-2008, 09:49 AM   #11
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Peter at TKO will work with you in anyway. he has taken care of any issues i have had. his new plus brg's are the way to go i have a new set in my 21-5k and have ben running with zero problems. Peter at TKO is a super nice guy. Roger Dame

Last edited by muscles 1; 03-11-2008 at 11:35 AM.
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Old 03-11-2008, 10:50 AM   #12
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Peter you have an email.
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Old 03-11-2008, 02:42 PM   #13
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i wonder what the problem is then ?? i am very practiced and knowledgeable when it comes to nitro engines and the only thing i could figure out was that the outer dia. was a lil too big . didn't measure , will soon
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Old 03-11-2008, 02:55 PM   #14
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Houston, I recently picked up the 5K myself, for a very good deal . Anyway, Ive been doing a LOT of research on it since. You're not the first I have heard with the TKO bearing size issue. Ultimately I don't know if there is an issue...BUT Peter truly is a stand up guy and will take care of you. Drop him a line
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Old 03-11-2008, 02:58 PM   #15
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I picked up the ~$80 RB bearing installation tool and the equally priced Ofna bearing install/removal tool. The combo works great.
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