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Loose bolts

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rv8a2001(at)yahoo.com
Guest

Posted: Tue Sep 16, 2008 4:17 am Post subject: Loose bolts

I have found all sorts of loose bolts on the engine. First it was the exhaust bolts, I had to tighten them 3 times before they would "hold". Then the valve covers started leaking, nothing new, this is "normal". Well the screws were so loose I could remove some with my fingers, now they have been tightened and the leaks have stopped and have not come loose again since. The last couple bolts I found loose were to the case halves! From what I have read about others and their loose hardware experiences, the next upcoming annual just months away, ALL fasteners will be checked over the entire aircraft.



 Scott

n223rv(at)wolflakeairport
Guest

Posted: Tue Sep 16, 2008 6:01 am Post subject: Loose bolts

Where did you get your engine?



--

rocketbob(at)gmail.com
Guest

Posted: Tue Sep 16, 2008 7:09 am Post subject: Loose bolts

One of the engineers I know from Lycoming has told me in the past that Lycoming case half bolts should be checked periodically for torque (100in/lbs) and that its not uncommon to find loose bolts.  In other words check them at every condition inspection.

 

Regards,

Bob Japundza

RV-6 flying F1 under const.



On Tue, Sep 16, 2008 at 8:15 AM, scott bilinski <rv8a2001(at)yahoo.com (rv8a2001(at)yahoo.com)> wrote:

 [quote]--> RV-List message posted by: scott bilinski <rv8a2001(at)yahoo.com (rv8a2001(at)yahoo.com)>

  

 I have found all sorts of loose bolts on the engine. First it was the exhaust bolts, I had to tighten them 3 times before they would "hold". Then the valve covers started leaking, nothing new, this is "normal". Well the screws were so loose I could remove some with my fingers, now they have been tightened and the leaks have stopped and have not come loose again since. The last couple bolts I found loose were to the case halves! From what I have read about others and their loose hardware experiences, the next upcoming annual just months away, ALL fasteners will be checked over the entire aircraft.

  

  Scott

 

 

 

 

 

 

 

 [b]

rv8a2001(at)yahoo.com
Guest

Posted: Tue Sep 16, 2008 7:28 am Post subject: Loose bolts

They were tight when the engine was new/refurbed. This was after several hundred hours flying. 



 Scott 



---

JSchans(at)lycoming.textr
Guest

Posted: Tue Sep 16, 2008 7:31 am Post subject: Loose bolts

Here is the actual tightening procedure.  

     

Jeff Schans  

        

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Bob J.

 Sent: Tuesday, September 16, 2008 10:34 AM

 To: rv-list(at)matronics.com

 Subject: Re: Loose bolts  

  

     

One of the engineers I know from Lycoming has told me in the past that Lycoming case half bolts should be checked periodically for torque (100in/lbs) and that its not uncommon to find loose bolts.  In other words check them at every condition inspection.

 

 Regards,

 Bob Japundza

 RV-6 flying F1 under const.    

On Tue, Sep 16, 2008 at 8:15 AM, scott bilinski <rv8a2001(at)yahoo.com (rv8a2001(at)yahoo.com)> wrote:  

--> RV-List message posted by: scott bilinski <rv8a2001(at)yahoo.com (rv8a2001(at)yahoo.com)>

 

 I have found all sorts of loose bolts on the engine. First it was the exhaust bolts, I had to tighten them 3 times before they would "hold". Then the valve covers started leaking, nothing new, this is "normal". Well the screws were so loose I could remove some with my fingers, now they have been tightened and the leaks have stopped and have not come loose again since. The last couple bolts I found loose were to the case halves! From what I have read about others and their loose hardware experiences, the next upcoming annual just months away, ALL fasteners will be checked over the entire aircraft.

 

  Scott

 

 

 

 

 

 

   

  

   

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SI1029D_Tightening_Procedurs_for_crankcase.pdf

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acepilot(at)bloomer.net
Guest

Posted: Tue Sep 16, 2008 1:29 pm Post subject: Loose bolts

I think the original poster stated that nuts WITH cotter pins had 

loosened.  How does this happen?  Isn't that what cotter pins are 

supposed to prevent?  If not, they're just extra weight I can eliminate 

on my -4 



Scott

scott bilinski wrote:



 	  Quote: 	
		  



I have found all sorts of loose bolts on the engine. First it was the exhaust bolts, I had to tighten them 3 times before they would "hold". Then the valve covers started leaking, nothing new, this is "normal". Well the screws were so loose I could remove some with my fingers, now they have been tightened and the leaks have stopped and have not come loose again since. The last couple bolts I found loose were to the case halves! From what I have read about others and their loose hardware experiences, the next upcoming annual just months away, ALL fasteners will be checked over the entire aircraft.



 Scott 

      

  




	


-- 

Scott

http://corbenflyer.tripod.com/

Flying Corben Junior Ace - Building RV-4

Gotta Fly or Gonna Die

Jess
Guest

Posted: Tue Sep 16, 2008 1:50 pm Post subject: Loose bolts

If your cotter pinned bolts are loose, two things to check  were they really torqued  correctly the first time or did the Bolts STRECH.  If they did, replace them.

  

  In a message dated 9/16/2008 2:30:29 P.M. Pacific Daylight Time,  acepilot(at)bloomer.net writes:

  	  Quote: 	
		  -->    RV-List message posted by: Scott <acepilot(at)bloomer.net>



I think    the original poster stated that nuts WITH cotter pins had 

loosened.     How does this happen?  Isn't that what cotter pins are 

supposed to    prevent?  If not, they're just extra weight I can eliminate 

on my -4    



Scott

scott bilinski wrote:



 	  Quote: 	
		  --> RV-List    message posted by: scott bilinski <rv8a2001(at)yahoo.com>



I    have found all sorts of loose bolts on the engine. First it was the exhaust    bolts, I had to tighten them 3 times before they would "hold". Then the valve    covers started leaking, nothing new, this is "normal". Well the screws were so    loose I could remove some with my fingers, now they have been tightened and    the leaks have stopped and have not come loose again since. The last couple    bolts I found loose were to the case halves! From what I have read about    others and their loose hardware experiences, the next upcoming annual just    months away, ALL fasteners will be checked over the entire    aircraft.



 Scott 

         

     




	


-- 

Scott

http://corbenflyer.tripod.com/

Flying    Corben Junior Ace - Building RV-4

Gotta Fly or Gonna  es  y       -->                 - MATRONICS WEB FORUMS  nbsp;               - List Contribution Web Site  ;                             =========================



	




Psssst...Have you heard the news? There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com.

  [quote][b]

Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Tue Sep 16, 2008 6:23 pm Post subject: Loose bolts

This is a phenomenon I have experienced on my RV-6A and also by other RV  builders I know.  It was actually brought to my attention by another  builder.  (Thanks, Charlie Bravo!)  After some hours in operation,  engine vibration & flight loads will tend to compress the stack of materials  at the engine mount bolt locations on the firewall, resulting in a natural  loosening of the nuts.  Each annual condition inspection, this is an item I  religiously check and address as necessary.

  

 Mark Phillips - RV-6A "Mojo" 500 hours and warming up for the next  C.I....



Psssst...Have you heard the news? There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com.

  [quote][b]

_________________
From The PossumWorks...

wnorth(at)sdccd.edu
Guest

Posted: Wed Sep 17, 2008 8:18 am Post subject: Loose bolts

Yeah,



It is likely compression of both the metal stack and the tube that projects

out which is the weld point for the rest of the mount.



What is frustrating is the four stayed tight for 1000 hours and then got

loose in the last 200.



On the case half discussion, all cases flex a microscopic amount as the

cylinder is projected away from the piston. Ya, you should check those

fasteners every chance you get.



On the Titan ECI AD, piss, I got 'em, fortunately am very low in the A group

and now need to do a comp check every 50 instead of 100 hours. And they did

a "hartzel" bait and switch by making them throwaway units after the fact.

Not that I disagree with this, running cylinders beyond the original TBO

comes at some increased risk. Given the low cost differential between

overhauled and new it is hard to justify reusing them over peace of mind.



But still it rankles one's sensibilities.

ghinman(at)mts.net
Guest

Posted: Thu Sep 18, 2008 5:38 am Post subject: Loose bolts

** 

<http://www.aircraftspruce.com/catalog/hapages/ms27151palnuts.php>

      I noticed one guy had -MS27151 PAL NUTS  - ON TOP of the regular

nuts on his crank case bolts.

        I do not know if this works,but may be worth a try for those who

have had loose engine bolts.



-- 



George H. Inman

ghinman(at)mts.net

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