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Reason for use of Silk Thread

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ulflyer(at)verizon.net
Guest

Posted: Wed Feb 03, 2010 10:49 am Post subject: Reason for use of Silk Thread

What is the purpose of placing a piece of silk thread along with 

sealant when joining the two cast halves of an aircraft engine.  Is 

this done on all engines or just Continental and Lycoming, what about 

4-stroke Rotax.

jerb

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frank.goodnight(at)att.ne
Guest

Posted: Wed Feb 03, 2010 1:46 pm Post subject: Reason for use of Silk Thread

Hi JERB<



Many years ago my favorite A&P told me , that on a good set of cases  

the silk thread is all the seal needed. and with other sealant  

[ permatex type ] there was a danger

that the excess that is squeezed out inside the engine MAY lodge in a  

oil passage and cause serious problems. I don't know if this is the  

gospel or not. However I have put

a couple of continental engines together using just #60 silk thread  

and they did not leak. I think it was # 60 I remember that it looked  

awfully small to me. Sorry I can't remember better

but it was a long time ago.



Frank Goodnight

Firestar2

Brownsville, TX





On Feb 3, 2010, at 1:44 PM, jerb wrote:



 	  Quote: 	
		   



 What is the purpose of placing a piece of silk thread along with  

 sealant when joining the two cast halves of an aircraft engine.  Is  

 this done on all engines or just Continental and Lycoming, what  

 about 4-stroke Rotax.

 jerb

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rmurrill(at)cox.net
Guest

Posted: Wed Feb 03, 2010 2:06 pm Post subject: Reason for use of Silk Thread

One of the classic reasons is to assure a minimum thickness of bond 

line...just like a scrim cloth in a composite bond....may be others as well.

Bob

---

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frank.goodnight(at)att.ne
Guest

Posted: Wed Feb 03, 2010 3:54 pm Post subject: Reason for use of Silk Thread

Hi JERB,

I cut myself off before I was finished. I don't know if  the silk  

thread  was used on any engines other continental , I built up a 65  

and a 85 it may be that with modern chemistry, and with better machine

work the rules have changed. Don't know anything about Rotax [wish I  

did]

Frank





On Feb 3, 2010, at 1:44 PM, jerb wrote:



 	  Quote: 	
		   



 What is the purpose of placing a piece of silk thread along with  

 sealant when joining the two cast halves of an aircraft engine.  Is  

 this done on all engines or just Continental and Lycoming, what  

 about 4-stroke Rotax.

 jerb

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slyck(at)frontiernet.net
Guest

Posted: Wed Feb 03, 2010 4:59 pm Post subject: Reason for use of Silk Thread

That's an oldie.  I did that on an 85 continental once and maybe an A65.  Don't remember if it helped.

Those engines had a lot of places to leak: pushrod tubes were common.  Could only re-swage them so many times.

O-ring at the tach drive will seep just enough to dirty the belly.

The low  pressure developed by the puny oil pump kept a huge leak from occurring. 

BB



On 3, Feb 2010, at 2:44 PM, jerb wrote:



 	  Quote: 	
		   

 

 What is the purpose of placing a piece of silk thread along with sealant when joining the two cast halves of an aircraft engine.  Is this done on all engines or just Continental and Lycoming, what about 4-stroke Rotax.

 jerb

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Feb 03, 2010 5:22 pm Post subject: Reason for use of Silk Thread

> The low  pressure developed by the puny oil pump kept a huge leak from 

occurring.

 	  Quote: 	
		   BB


	




Bob B/Gang:



I am fortunate with my leak/ooze in that respect.  I am dealing with 

crankcase pressure of 3 to 5 psi in the gear box.  Thank goodness it is not 

the engine oil pressure or I would be dealing with about 50 psi.



1936 John Deere D, if the oil pressure needle comes off the peg, it is good 

to go.  



john hauck

mkIII

titus, alabama

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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