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Home✈️Aircraft🚁HelicopterHIROBOOther › Hyper 50 in Sceadu causing big trouble
08-06-2007 01:43 AM  13 years ago
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taylorcoleman

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Pittsburgh, PA

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Hyper 50 in Sceadu causing big trouble
Hello all.

I purchased a 2nd hand Sceadu 50 (w/ OS Hyper 50)--my first nitro bird. After a few flights, my flying buddies told me that the rear bearing was bad. So I searched through RunRyder and found some great info on changing the rear bearing--a big pain, but it's done.

I was able to start the engine after the rebuild, but after 2-3 minutes, it stopped. The engine now seems to get very tight--to the point where my starter can't turn it over--turning the starter crank by hand is also quite difficult.

After I let it rest for maybe 30 mins or so, I can turn over the engine, but only briefly before it get tight again. I've taken out the glow plug and blown out the engine with the starter to remove any potential hydro-lock fluid, but that does not seem to help.

Any thoughts on what this might be?
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08-06-2007 01:46 AM  13 years ago
Alex Rodriguez

rrApprentice

Ohio

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Have you checked to make sure that the fan hub it still seated on the front bearing? If it backed out the clutch will push up on the clutch bell and lock up the motor.
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08-06-2007 02:09 AM  13 years ago
Leif

rrElite Veteran

USA

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I concur. It is most likely that the flywheel and fan have backed off of the crankshaft a bit. This causes the start shaft and clutch to bind against the frame bearings.

To check if this is the case, loosen the four bolts that hold the engine mount to the frame. Without fuel or glow heat, attempt to turn the engine over with your starter. If it now seems OK, you have located the problem.

To fix this, you'll need to drop the engine back out of your heli and remove the clutch. Then, remove the crankshaft nut and flywheel/fan hub. Did you use a crankshaft locking tool (that locks the crankshaft against the conrod from the back) or how did you hold the crankshaft when you tightened the flywheel and nut?

I use the handle of a screwdriver to lock the crankshaft against the conrod when putting on the flywheel. I also install the two clutch bolts into the top of the flywheel, and then use a screwdriver between the bolt to torque down on the flywheel. I also use a bit of blue loctite for this job. Once the flywheel is on tight, I use a bit of loctite and a prop wrench to install the nut.

Leif
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08-08-2007 06:39 PM  13 years ago
taylorcoleman

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Pittsburgh, PA

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Fixed
Thanks for the tips!

Yes, the fan and clutch were not bolted down far enough which was causing the problem.

Up and flying again...
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08-09-2007 07:38 PM  13 years ago
pcskyhi

rrApprentice

Houston, TX

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I had to look twice when I saw your name. My 2 year old daughter is named Taylor Coleman. I was thinking Oh no she did not go in my hobby room and put a hyper engine in my Evo when I just bought a YS 50 to put in itpcskyhi - live and learn
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