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Old 07-14-2010, 02:53 PM   #1
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Default Replacing Engine Bearings

Hey Guys
I need to change the front and rear bearings in my Axe Rossi motor. They feel like they are getting sloppy… This is something I haven’t done before but it really doesn’t look that complicated. Can anyone give me some tips or pointers on how this should be done correctly or “the easy way”
Do I need a press or anything else special?
This motor is for my 1/8 buggy.

Thanks
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Old 07-14-2010, 03:11 PM   #2
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strip the motor bare stick it in the oven or heat gun get it to 240 and lightly smack the rear end on something like wood and should pop right out use a wood dowl to push the frnt one out u tube has a good video best way just get a bearing puller u will need it again
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Old 07-14-2010, 03:20 PM   #3
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Put the engine in an oven at 250deg for 15 min. Use an ove glove to handle and the bearings should fall out by just tapping the block on a hard surface. You can use the crank to help align the rear bearing once it’s loose in the case. It's a little tedious getting it lined up and out of the case

If you’re quick you can put the new bearings in while the case is still hot. It's best to have a bearing alignment tool to get the bearing aligned perfectly. You can tap on the bearings a little to get them aligned, but sometimes it's pretty hard to get them perfect. If you’re replacing with ceramics, don't tap on them or you will chip the balls. You need an alignment tool for ceramics that presses on the outer races only.
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Old 07-14-2010, 03:35 PM   #4
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I need this engine fixed now so I have to get the bearings from my LHS. The only bearings he had in stock was a steel front bearing and a ceramic rear. I will be careful not to tap the ceramic.
Thanks
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Old 07-14-2010, 03:38 PM   #5
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Originally Posted by xray2050 View Post
I need this engine fixed now so I have to get the bearings from my LHS. The only bearings he had in stock was a steel front bearing and a ceramic rear. I will be careful not to tap the ceramic.
Thanks
put the bearings in the freezer they go back in alot easier just put the rear bearing on the crank and push it in. If the block is still hot it should be no prob.
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Old 07-14-2010, 03:38 PM   #6
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http://www.youtube.com/watch?v=WhpwsjYoxM0

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Old 07-15-2010, 03:38 AM   #7
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I have to change my rear bearing on my motor. Will probably purchase a bearing puller kit.
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Old 07-15-2010, 08:36 AM   #8
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I have to change my rear bearing on my motor. Will probably purchase a bearing puller kit.
That is the best way, but bearing pullers are expensive and not absolutely necessary. It's more important to get a bearing alignment tool to make sure they are perfectly aligned.
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Old 07-15-2010, 08:49 AM   #9
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I like the video, but what they don't cover is cleaning the block before putting the new bearings in and you can't align the bearings with the crankshaft because it only touches the inner races. The NR alignment tool is awesome and it aligns the outer races. I use it on brand new engines and not always, but sometimes will free up a brand new engine. They are the shizit!
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Old 07-15-2010, 09:01 AM   #10
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so your saying putting the bearing into the crankshaft is NOT the best way to line up your bearing, and why????
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Old 07-15-2010, 09:15 AM   #11
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so your saying putting the bearing into the crankshaft is NOT the best way to line up your bearing, and why????
Because the crank is trying to use the inner races to push the balls against the outer races. Think about it. All those little balls are aligning the outer races. Like I said, its not the best way. The best and correct way is to use an alignment tool that alignes the outer races. Once you use one, you will agree.
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Old 07-15-2010, 09:31 AM   #12
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Because the crank is trying to use the inner races to push the balls against the outer races. Think about it. All those little balls are aligning the outer races. Like I said, its not the best way. The best and correct way is to use an alignment tool that alignes the outer races. Once you use one, you will agree.
what does that tool look like, im trying to search for it but i cant find it!
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Old 07-15-2010, 09:39 AM   #13
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what does that tool look like, im trying to search for it but i cant find it!
http://www.novarossiusa.com/index.php?cPath=54_55
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Old 07-15-2010, 06:03 PM   #14
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Originally Posted by xray2050 View Post
Hey Guys
I need to change the front and rear bearings in my Axe Rossi motor. They feel like they are getting sloppy… This is something I haven’t done before but it really doesn’t look that complicated. Can anyone give me some tips or pointers on how this should be done correctly or “the easy way”
Do I need a press or anything else special?
This motor is for my 1/8 buggy.

Thanks
here are some tips from RB:

http://www.rbproducts.com/mainEn.php...ncept%20engine
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