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Old 09-27-2010, 03:43 PM   #1
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Default How do you know if your rear bearing is shot?

As per the title, how do you know if your rear engine bearing is shot?
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Old 09-27-2010, 08:13 PM   #2
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a good way to tell is open the engine up, really there isnt much inside these motors so you should be alright doing this unless its your first time id wait for a more experienced person to tell you. ive taken several apart and can tell you based on my experience. open the motor up and look at the bearings. if the outer shell of the bearing is cracked,dented, scuffed. its bad. if the inner shell of that same bearing is any of the above once again its bad. or if there is alot of play int he bearing, same thing its bad. to tell a bad bearing in case you dont know take a bearing out of somewhere else you assume is good, if there is a noticable differance between the play on the two, its bad. pretty basic stuff but i cannot tell you how to tell if its bad without taking it apart. sorry but hope it helps you some
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Old 09-27-2010, 08:14 PM   #3
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That's a big help thanks.. I thought it was more difficult then that..

lol
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Old 09-27-2010, 08:20 PM   #4
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no its pretty simple man. also if the seal on the front side or backside of the bearing is off, its a good idea to jsut replace the bearing. i mean bearings are waaaaaaay cheaper then buying a new engine, so juse take the time and learn a few things. take it slow while pulling the motor apart if thats the way your gonna do it, check where every piece goes, there really shouldnt be more then maybe 6 things inside that motor that will come out without a lot of grief
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Old 09-27-2010, 08:33 PM   #5
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Just spin the crank back and forth and if it's not smooth or feels gritt then I would replace both bearings and btw when you replace the rear bearing alwYs always replace the front too. Also if you pay attention the noise that the engine makes at an idle will change when the rear bearing is bad.
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Old 09-27-2010, 08:37 PM   #6
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i have a buddy who really good at hereing them that about the only way i know when to change them lol
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Old 09-27-2010, 08:45 PM   #7
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Blaine. I can tell just by listening to the motor run. It starts kinda hissing then you should get worried LOL. Are you thinking that it happened yesterday? Your motor sounded pretty good.
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Old 09-27-2010, 09:59 PM   #8
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A bad bearing is always noticable any where. It its not smooth then replace it. A lil gritt in some bearings isnt bad but will get wore but in engine thery spin the crank and if feels a lil gritty or rought they need replacement. Also like said aswell the engine will make noises like hissing, and verious noises that are off setting. Normally a bearing replacement is popular after about 2 gallond or so on non ceramics in an engine. Not saying they blow out that fast its just common to replace them. Also since im this far if you dont wanna spend the 100 bucks on a bearing puller youtube how to remove nitro engine bearings and it will show a cheap and easy way to do so. I recommend if you got the money just send it to the speed shop or some where similar and just get a cleaning, check up, and bearing replcement. For the price and tko bearings included and installed is a unbeatable deal.
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Old 09-28-2010, 03:32 PM   #9
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Quote:
Originally Posted by Akhor View Post
That's a big help thanks.. I thought it was more difficult then that..

lol
Dont forget to put the piston on top dead center, before you pull the back plate off or you will break the piston skirt
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Old 09-28-2010, 04:32 PM   #10
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Quote:
Originally Posted by teamlosi906 View Post
Dont forget to put the piston on top dead center, before you pull the back plate off or you will break the piston skirt
agree!
just replace them both and be done with it and its a good time for a complete inspection such as checking for chrome metallic bearing particles and rod/crankpin slop
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Old 09-28-2010, 04:57 PM   #11
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Also well you got the motor apart you might as well check them pesky muffler bearings
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Old 09-29-2010, 02:32 PM   #12
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Originally Posted by sluggo_sx8 View Post
Also well you got the motor apart you might as well check them pesky muffler bearings
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Old 09-29-2010, 02:37 PM   #13
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Default Bad rear bearing

It usually vibrates more and makes a rattle noise if the rear bearing is going out.
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Old 09-30-2010, 12:45 PM   #14
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Engine usually starts popping plugs too when rear bearing is done .
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