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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › os hyper 50 rear bearing
02-04-2008 06:20 PM  10 years agoPost 1
wildcatflyer

rrApprentice

South Portsmouth, Ky

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Can anybody suggest the best way to remove a rear bearing from a hyper 50 that does not easily come out. I have the front bearing removed already, but the rear bearing is giving me problems. Thanks.

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02-04-2008 06:26 PM  10 years agoPost 2
SteveH

rrProfessor

Texas

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You have to heat the crankcase in the oven for about 15 minutes at 250 degrees, and then the bearing will almost fall out.

The government cannot give you anything without first taking it from someone else.

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02-04-2008 07:04 PM  10 years agoPost 3
wildcatflyer

rrApprentice

South Portsmouth, Ky

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I've already done that, but have not had luck getting this bearing out. I've done this several times and they have mostly just fallen out like you said except for this time.

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02-04-2008 07:13 PM  10 years agoPost 4
dasd

rrVeteran

Carol Stream, IL

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I had the same problem. Here's what worked for me; your mileage may vary.
I put the case and bearing in the freezer for 20 minutes. After that, I put it in a toaster over at 300 for 10 minutes. I used a scrap piece of 2X4 and an oven mitt and smacked the back of the case down a couple of times and it finally broke loose.

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02-04-2008 07:39 PM  10 years agoPost 5
wildcatflyer

rrApprentice

South Portsmouth, Ky

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Thanks, I'll give that a try.

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02-04-2008 11:28 PM  10 years agoPost 6
airdodger

rrElite Veteran

Johnston USA

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Why not just put the bearing back together and stick a dowel through the front and give it a couple of strikes.

Chris

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02-06-2008 10:43 PM  10 years agoPost 7
jschenck

rrProfessor

La Vista, NE.

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Not sure if you got this done yet but I had a real problem with a rear bearing that came apart leaving just the outside race. 8 hrs boiling in antifreeze followed by 400 deg. F in the toaster oven for 20 minutes and it came out:

http://runryder.com/t405561p1/

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02-07-2008 03:56 AM  10 years agoPost 8
Ace Dude

rrProfessor

USA

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400 degrees F can definitely ruin the crankcase.

  

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02-07-2008 04:53 AM  10 years agoPost 9
jschenck

rrProfessor

La Vista, NE.

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Perhaps but I was stuck. I normally use 300 deg. and a good smack on a 2X4 but without the full weight of the entire bearing assembly I needed the extra expansion. My case looks fine right now but I have not ran it yet.

Have you run into problems with high heat on an engine case?

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02-07-2008 12:54 PM  10 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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Oh please don't get him started

Andy
AMA 77227
http://www.jaxrc.com

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02-07-2008 01:39 PM  10 years agoPost 11
Ace Dude

rrProfessor

USA

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Have you run into problems with high heat on an engine case?
Not me, but there are quite a few self proclaimed experts on the subject here....

  

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02-07-2008 03:44 PM  10 years agoPost 12
jschenck

rrProfessor

La Vista, NE.

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I read back through some of your posts on the subject - looks like you've have good luck with and prefer the torch method. I'd be concerned with the uneven heating this could potentially cause especially if you have a just the outside race left in the case requiring more effort to get it out. I'd be curious to see the results of hitting the crankcase with an IR temp gun while running a torch over the case. wonder what the peak temp would be before a gummy engine released the bearing.

I did clean the engine via antifreeze bath followed with hot soapy water and a tooth brush (Lava hand soap works great!) before putting it in the same place my bagels and toast goes! Also put some aluminum foil down - No nitro grease on my day old Panera's !

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02-10-2008 08:28 PM  10 years agoPost 13
wildcatflyer

rrApprentice

South Portsmouth, Ky

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A quick update to anyone interested. Got myself a cheap toaster oven and put the crankcase in for 12 minutes at around 275 degrees and one knock on a board and the bearing dropped right out. Not saying the toaster oven is the way to go, but I'm happy the bearing is out so I can finish putting it back together.

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