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08-03-2009, 01:55 PM
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#1 |
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Flyin' Around
 Join Date: May 2006
Location: Halifax, NS, Canada
Age: 57
Posts: 8
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OOPS! How do I check engine runout?
After determining the exact amount of pressure it takes to bend my wing tube while flying on the weekend (and exceeding it by 1%)
 , I now have a run out problem on the engine. The engine is a DL-100 and, although the impact was low (loose soil, engine off), I have checked the run out of the prop hub and get a reading of 10.5 thou which seems like a lot.What the best approach here? Remove the prop hub and recheck the run out on the actual crankshaft? Tap the prop hub til it's reads 0? Also, what number should I be looking for - 0, 1, 2??? Any help and advice is appreciated - don't want to make the situation worse. Last edited by smosher; 08-03-2009 at 03:02 PM. |
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08-03-2009, 07:09 PM
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#2 |
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Bad-ass Super Contributer!
 Join Date: Apr 2006
Location: Locust NC
Age: 63
Posts: 389
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Re: OOPS! now I have to check my engine run out
Remove the prop hub and recheck the crankshaft. There is also a very good chance that it had that much run out to begin with. Seems some of the Chinese engines are a little short on precision.
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08-03-2009, 07:32 PM
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#3 |
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Bad-ass Super Contributer!
Join Date: Nov 2007
Location: Port Orchard, WA
Age: 61
Posts: 6,864
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Re: OOPS! now I have to check my engine run out
Before you do anything put an indicator on the face of the hub and check the run-out there. That should tell you if the run-out was caused by the crash or came from the factory that way.
__________________
 http://www.southeastrcengines.com http://www.vessaero.com Remember every second of every day there are thousands of men and women giving of their lives to keep you safe. Never forget them for they never forget you!! |
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08-03-2009, 08:18 PM
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#4 |
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Bad Ass Super Contributor
Join Date: Jun 2008
Location: Tacoma, WA
Age: 50
Posts: 1,980
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Re: OOPS! now I have to check my engine run out
Before you do that, if the hub is original, (looks like a pulley), I'd check for a crack opposite the magnet, then remove it and check the crankshaft. Measuring run out on a cracked hub is a waste of time. If the crank is bent, I suggest that the dirt wasn't as soft as previously thought, DL cranks are not easy to bend. DL cranks and hubs are also very accurate, I've measured many and the hub, hub face and pilot shaft are always within .002".
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08-03-2009, 10:27 PM
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#5 | ||||||||||||||||||
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Bad-ass Super Contributer!
Join Date: Jun 2006
Location: Louisville,KY
Age: 53
Posts: 3,049
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Re: OOPS! How do I check engine runout?
That is too much. I have used the runout gauge and a hammer to square away two gas engines after a crash but I am not anal about such things. If it is within a few thousandths and runs good I don't worry about it. One engine I still have and is still good , the other I gave away to another guy that needed an engine.
__________________
A.M.A. #518216 |
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