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HelicopterEngines Plugs Mufflers Fuel › OS Engine Bearings
04-06-2011 09:38 PM  6 years agoPost 1
nickt919

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New Orleans, Louisiana

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I wish OS would design a 2 piece crank and rod so that you could change the rear bearing without taking the engine out. Pull the 4 back plate screws, maybe one bolt joining a keyed two piece crank, and a last one or two cap screws on the rod bottom. Then...bingo there's the bearing.

I know it will never happen but it's just a thought to make bearing replacement easier and faster since some of the current bearing arrangements don't last too long.

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04-06-2011 10:16 PM  6 years agoPost 2
GMPheli

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W. Bridgewater, MA USA

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The thing I hate most about changing bearings is redialing the hub. I wish the Heim crank would come back. A clutch you just bolt on and go. Throw your dial indicator away. Was this too convenient to catch on?

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04-10-2011 04:37 PM  6 years agoPost 3
Neon Juripuri

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Peculiar Mo USA

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[quote]The thing I hate most about changing bearings is redialing the hub.

Why don't you just mark the hub,and clutch so it goes back together the same way? No need to get out a dial indicator to replace a bearing.
Fred

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04-10-2011 07:21 PM  6 years agoPost 4
DOKEY

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Northamptonshire UK

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Why don't you just mark the hub,and clutch so it goes back together the same way? No need to get out a dial indicator to replace a bearing
If only it was that easy. You need to dial it in etc every time, when you want to get things running to the best performance you possibly can.

Ryan.

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04-10-2011 11:33 PM  6 years agoPost 5
Neon Juripuri

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Peculiar Mo USA

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Why get the indicator out if you are putting it back in exactly the same spot? Nothing has changed.
Are you a gizmo freak
Fred

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04-11-2011 12:56 AM  6 years agoPost 6
GMPheli

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W. Bridgewater, MA USA

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Unfortunately, it does not work that way. Even if you mark it and put it on at the same spot it never goes back exactly the same. In order to dial it in I spend a considerable amount of time with a plastic hammer. I am not happy until I get less than a thou.

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04-11-2011 05:00 PM  6 years agoPost 7
MartyH

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USA

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It will not go back together exactly the same and you will need to dial it all over again. It's nice in theory but it doesn't work that way.

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04-12-2011 10:40 PM  6 years agoPost 8
Raptor Pilot

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Northern Ireland U.K

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Webra speed 60 engines were made so that you removed the back plate and unbolted the front houseing and were able to change the two bearings without removeing the head, liner, piston or con rod. You still would have to remove the engine from the heli and remove the clutch and fan!

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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04-12-2011 11:18 PM  6 years agoPost 9
GMPheli

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W. Bridgewater, MA USA

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It was also found that the 2 piece crankcases flexed more than the one piece. Clarence Lee always recommended JB welding the front half of the crankcase on. He said you would pick up about 500 rpm when running with a prop.

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