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Stuffed hole help

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VHMUM(at)bigpond.com
Guest

Posted: Tue Nov 06, 2007 4:11 pm Post subject: Stuffed hole help

Guys while finishing the bafling I cross threaded  one of the holes in the front cylinder that the bafling is held on  with . Its the front Right hole that the front dam is held on with.  This is loking from front of engine. 

 I got the corect tap and now the screw does go in  but seems very loose until it in all the way in.  Any ideas to tighten  it up? I was thinking Loctite but the temperature range is to low?

  

 regards Chris 388 

   [quote][b]

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Tue Nov 06, 2007 5:18 pm Post subject: Stuffed hole help

I'm not sure if they'll have the size you need or not, but perhaps

a heli-coil insert or something like that would work.



Tim Olson - RV-10 N104CD - Flying



Chris and Susie McGough wrote:

 	  Quote: 	
		   Guys while finishing the bafling I cross threaded one of the holes in 

 the front cylinder that the bafling is held on with . Its the front 

 Right hole that the front dam is held on with. This is loking from front 

 of engine.

 I got the corect tap and now the screw does go in but seems very 

 loose until it in all the way in.  Any ideas to tighten it up? I was 

 thinking Loctite but the temperature range is to low?

  

 regards Chris 388

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Tue Nov 06, 2007 10:11 pm Post subject: Stuffed hole help

Ouch - I think the heli-coil insert would be #1 as Tim suggested



Might look for some high temp epoxy as a reinforcement. But that would make it a one way repair. removal then would be impossible except with a bridge plate.



Locktite does not seem to have the lower viscosity taht you need

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_________________
See you OSH '18
Q/B - sold.

msausen

Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA

Posted: Thu Nov 08, 2007 7:56 am Post subject: Stuffed hole help

Yep agreed on the heli-coil.  When you cross threaded and re-tapped it you lost some of the surface area for holding and I definitely would not rely on it as is.  Almost certain for it to vibrate loose.  Depending on the actual location, you might be able to drill and tap it with the next closest size in metric also.  But I would check with an engine builder to make sure you have enough material before you do that.



Michael



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BPA(at)bpaengines.com
Guest

Posted: Thu Nov 08, 2007 8:34 am Post subject: Stuffed hole help

For some reason, I'm not getting any RV10 original posts, just responses

(Matt?). Anyway, not knowing where the bad hole is, if it's an exterior

hole a regular heli-coil is fine. However, if it's an interior use the

locking heli-coil. These are noticeably different as the locking

heli-coil is red in color. If you look at it closely, you'll notice that

the interior threads have a flat segment on a couple of threads. Hopes

this helps.



Allen Barrett

Barrett Precision Engines, Inc. 



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