.21(+) - Rear Bearing Puller...let me know what you think - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-02-2009, 06:02 PM   #1
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.21(+) - Rear Bearing Puller...let me know what you think

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Recently i had to change the rear bearing in one of my engines. In the past, i've never been a huge fan of heating the block in the oven and 'banging' it on a piece of wood to remove the rear bearing(or however the 'make-do' procedures go)...i'd rather not be a hack like that...i had a look at some of the ridiculously over-priced bearing pullers made by Nova, RB, and JP, and GRP(cheapest being around $150) and decided the principle is simple enough, so i'd just make my own up. Gotta love working in a machine shop! I didn't like the idea of using steel, etc, so i made it out of brass so it wouldn't 'mar' anything up. Here are a few pics. Worked great pulling out my bearing, and Vic Garcia's. I am going to make a few more up for a few guys, but figured i would check to see if anyone on here was interested in having one made? Not sure on a price yet, so i'm open to any thoughts for something affordable for everyone! This is for a 14mm ID bearing, but can be changed if needed to suit your engine. For Price, $35 each.

this being the prototype, i'm going to change up a few things for ease of use...2 pressed dowel pins coming out the side of the 'nut' portion of the puller for a handle, and a 17mm hex on the threaded portion, since everyone has a glow plug/wheel wrench in their toolbox, as well as a 5/32 or 4mm allen key(either will fit nicely)

I'm assuming everyone can figure out how it works...but if not:

there is a flat head cap screw that threads into the end, tightens against a taper, which forces the four 'fingers' out against the inner race of the bearing...the small shoulder at the end won't allow the bearing to slip off, yet is small enough to fit behind the bearing, between the block. the 'nut' portion goes up against the back of the block(so everything remains square), then turn the 17mm hex counter-clockwise, and out comes the bearing.

Anyways, all comments welcome,

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Old 05-03-2009, 10:49 AM   #2
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very nice work, looks good, i was thinking you could also make a fly wheel puller pretty easy out of the same stuff, steel might be better, just need to make a jaw nlooking part to slide over everything then a bolt with a tapered end, thighten in the bolt and off pops the fly wheel, dosent need much travel, just enough to pop it off the collet, then youd be able to sell them as a set. just an idea
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