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HelicopterMain Discussion › Hyper front bearing replacemtn
12-13-2008 10:40 PM  9 years agoPost 1
busyflyin

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Owosso, MI USA

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Does anyone know of a thread that covers how to replace the hyper 50 front bearing?

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12-13-2008 10:53 PM  9 years agoPost 2
jamming

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rockport,wa

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If the bearing failed chances are other areas are damaged. Send it to OS ! Special tools cost more than a new hyper. If you are mechanically inclined just take you time and figure it out. Don't know of any web sites because it's not normally recommended.

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12-13-2008 11:33 PM  9 years agoPost 3
bah7566

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Colorado

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It's actually fairly simple if you know what you are doing. Here is a link to an article on the bearing replacement subject. YouTube also has a good video of the process and required tools.

http://www.raptortechnique.com/enginebearing.htm

http://www.youtube.com/watch?v=TuzEco3EDUM

http://www.youtube.com/watch?v=OLSoXPLGzOI

I am a Heli addict!!!

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12-14-2008 12:20 AM  9 years agoPost 4
donthomas

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gibsonville, nc usa

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The 1st rule is always wait until your wife is not home. They tend to get excited to find model heli parts cooking in their ovens. Other than that it's a easy fix.

Don Thomas

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12-14-2008 02:06 AM  9 years agoPost 5
TMoore

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Cookeville, TN

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Front bearings on a hyper will typically tap out once the crank is out but it is easier to heat the case to 325F to reinstall the bearings. Front bearings rarely go bad on modern 2 stroke model engines.

TM

Delayed Response Operator Not Engaged

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12-14-2008 02:16 AM  9 years agoPost 6
dkshema

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Cedar Rapids, IA

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jamming...the only "special tool" required to remove and install bearings on a Hyper (or just about any other model engine) is an oven.

Heat the crankcase to 325 or so in an oven, the front and rear bearings essentially fall out. If they are a bit stubborn, a sharp whack of the hot crankcase on a block of soft wood will pop them out.

To reinstall, reheat the crankcase, the front bearing usually drops right in. I put the rear bearing on the crankshaft while the crankcase is heating in the oven. I then pull the crankcase out of the oven, drop the front bearing in, then insert the crankshaft with bearing in from the rear. The rear bearing will seat in the case. I then simply make sure that the front and rear bearing are properly seated until the case cools down.

If you can, put the prop drive washer on the front end of the crank, a prop, and a nut (finger tight) while things cool down to make sure the bearings are fully seated.

The whole operation takes only a few minutes (outside of waiting for the crankcase to heat up) to swap out bearings. No tools, no fuss, no muss.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-14-2008 04:53 AM  9 years agoPost 7
busyflyin

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Owosso, MI USA

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Thanks guys, seems easy enough. I might as well replace the rear while I'm at it.

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12-14-2008 05:18 AM  9 years agoPost 8
bah7566

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Colorado

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dkshema explained it perfectly. It is usually the rear bearing that needs replaced. Just make sure you have everything stripped from the case before you heat it. Carb, head, piston, crank, sleeve etc. You'll be a bearing changing fool after you have done it a time or two. The worst part is removing and installing the engine on the helicopter.

I am a Heli addict!!!

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12-14-2008 06:39 AM  9 years agoPost 9
Life_Nerd

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USA

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I used the OS 50SX-H Troubleshooting and Repair Tips document found here:

http://www.genesishobby.com/whitepapers.aspx

No special tools required except the oven.

Scott

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12-14-2008 03:02 PM  9 years agoPost 10
rcjon

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Macon, GA

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The method demostrated to me to me by the most experienced modeler around involved using a propane torch to heat the crap out of the case. Seems to work ok.

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HelicopterMain Discussion › Hyper front bearing replacemtn
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