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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › How to Remove Bearings
06-03-2009 04:05 PM  9 years agoPost 1
PeteS

rrApprentice

St. Louis, MO

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Guys,

I am replaceing bearings in my OS 50 Hyper. This is the first time I have done this. I found a video on how this is done. It indicates that you should heat the engine at 212 degrees for ten minutes.

I did this and could not get the rear bearing out. I did another ten minutes, still would not come out. I am striking the case against my wood bench as the video says.

Any hints on how to get these out? Higher temperature?

Thanks!

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06-03-2009 04:57 PM  9 years agoPost 2
Heli 770

rrProfessor

USA.

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No problems with 325 degrees F.

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06-03-2009 04:59 PM  9 years agoPost 3
PeteS

rrApprentice

St. Louis, MO

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Success!

325 degrees for 15 minutes did the job.

Thanks!

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07-13-2009 03:08 AM  9 years agoPost 4
Sam2b

rrElite Veteran

Tacoma, WA

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BUT, if you put the rear bearing in wrong and get it jammed, this method alone won't work. You'll have to tap it out through the front bearing. (ask me how I know)

Putting the rear bearing back in should be done by first putting the rear bearing on the output shaft and sliding it in after heating the engine block. Then it should be very easy.

_Sam B_

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07-13-2009 03:50 AM  9 years agoPost 5
TMoore

rrMaster

Cookeville, TN

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The correct procedure after you get the bearings prior to a reinstall is to slide the big bearing on the crank in the correct orientation as in retainer flat side toward the front of the engine. Then take the small front bearing and slide it on the crank with the open side facing toward the threads. Heat the case to 340 degrees for the reinstall, install the front bearing in the case using the crank as the tool, once the bearing is seated all the way in the front bore, slide the crank out and install the crank with the large bearing in the block. Give the crank a couple of quick spins and set it aside to cool. Please use an Oven Mitt while doing this.

TM

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