Jim Mahoney
Senior Member
Posts: 2243
Loc: California
Reg: 06-17-03
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08-15-09 04:44 PM - Post#87722
Hello All,
Checking around I found a number of U-Tube Videos about changing bearings and such. I will post links as I find them.
Replacing front and rear ball bearings:
http://www.youtube.com/watch?v=TuzEco3EDUM
How 2-Stroke Engines work:
http://www.youtube.com/watch?v=LuCUmQ9FxMU&a mp;fea...
One note, I think heating the crank case in an Oven is best as you even heating -- less chance for distortion. The key to using a torch is as shown in the Video -- Quickly moving the torch around the whole area --- to get as even heating as possible.
Happy Flying,
Cherokee Jim Mahoney 
Multiplex - ACT Radios, Youngblood Gyros & Governors, YS Engines, Blitz AVRO 90 - Phoenix Simulator - A123 Batteries - Mikado Helicopters - Hacker Motors & Controllers
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Edited by Jim Mahoney on 08-15-09 04:47 PM. Reason for edit: No reason given.
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Jim Mahoney
Senior Member
Posts: 2243
Loc: California
Reg: 06-17-03
|
Re: Work on Your Engines
08-24-09 05:35 AM - Post#87736
In response to Jim Mahoney
Hello All,
This is a pretty good video but I would do a few things a little differently.
I am not a fan of torches, yes someone with a lot of experience can do it with a small risk of distorting the case - But its better to just take the time and pop the case back into the oven to heat it a little more.
These days one can buy a small bench press cheap, maybe $20, it is better to press bearing in and out, still good to use some heat, Oven, Make a tool which has a center piece which very lightly fits the Inter Diameter of the bearing - this guides the bearing in straight. Make sure the base of the press and the crankcase of the engine are normal to the press so the bearing is pressed in or out straight into or out of the crankcase. The tool used to press the bearing should be relieved to just touch OUTER EDGE of the bearing only at three points, three point contact is surest way to make even contact, that's why we have tripods and usually not Quadpods.
Invest a little money and get combo medium and hard plastic faced hammer - about 1000 times less chance of damaging something when Tapping something into place.
Another way is like the bearing tool that Dub Jett sells for his engines. I'll go and get the links to page on his website which shows the tool.
Guess I will have to make an example tool that I was talking about and do my own Utube Video, Hey I could be a Star! Will Maybe not - I'll see if I can get a Cute Gal to show the steps - Or I'll do what the fella did in his video, just show the hands doing the Work.
In any case I will make a tool, I need to change the bearings in an OS32 anyway, first I will do a drawing and post it.
Oh Yes a point needs to be made about using a press - Be Careful! A bench press can exert a lot of force - enough force to destroy a crank case! When you are ready to remove the bearings take a careful look at the position, the relation of the outer edge of the bearing to the edge of the crankcase it is sitting in so you will know how far you should press in the bearing. This is a good reason to heat the crankcase so the bearing will slip in with just a lite press. Think of using the bench press as a way to evenly press in the bearing and not as way to apply a lot of force.
Now I'll get the Link for Dub Jett's site:
Go to the website and click on Mufflers and Accessories, its the last item.
http://www.jettengineering.com/
While you are over there checkout Engine Break in and The Crap Trap page.
Mr. Jett also has instructions for Changing Bearings.
Also check out Jett's FAQ section lots of good info.
Happy Flying,
Cherokee Jim Mahoney
Multiplex - ACT Radios, Youngblood Gyros & Governors, YS Engines, Blitz AVRO 90 - Phoenix Simulator - A123 Batteries - Mikado Helicopters - Hacker Motors & Controllers
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Edited by Jim Mahoney on 08-24-09 05:51 AM. Reason for edit: No reason given.
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