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Plenum vs engine lifting rings

 
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recapen(at)earthlink.net
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PostPosted: Mon May 07, 2007 3:23 am    Post subject: Plenum vs engine lifting rings Reply with quote

Folks,

I am starting the work on my cowl/plenum. Looks like I'll need to remove the lifting rings from the top of the engine. The bolts are too long to just put back in and a 4-15 would fit nicely. The issue that I am seeing is that the original bolts are coarse thread - and I can't figure out what to order - or from where for that matter.

Any guidance would be appreciated,
Ralph


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Hopperdhh(at)AOL.COM
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PostPosted: Mon May 07, 2007 6:59 am    Post subject: Plenum vs engine lifting rings Reply with quote

Ralph,

You can order the bolts from Aircraft Specialties. They would probably be
glad to look the part number up for you. Truth be told, I don't think some
bolts from the hardware store or NAPA would hurt a thing. Uh oh, I better go find
my nomex underwear!

Dan Hopper
RV-7A


In a message dated 5/7/2007 7:24:33 AM Eastern Standard Time,
recapen(at)earthlink.net writes:

<recapen(at)earthlink.net>

Folks,

I am starting the work on my cowl/plenum. Looks like I'll need to remove the
lifting rings from the top of the engine. The bolts are too long to just put
back in and a 4-15 would fit nicely. The issue that I am seeing is that the
original bolts are coarse thread - and I can't figure out what to order - or
from where for that matter.

Any guidance would be appreciated,
Ralph

************************************** See what's free at http://www.aol.com.


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recapen(at)earthlink.net
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PostPosted: Mon May 07, 2007 7:18 am    Post subject: Plenum vs engine lifting rings Reply with quote

Thanks for the tip....I'll give aircraft specialties a look see!
Other educated sources say that a coarse grade 8 bolt is sufficient as you have indicated - fine thread may allow too much torque nd possibly crack the case.

--


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Discover



Joined: 26 Feb 2007
Posts: 429

PostPosted: Mon May 07, 2007 7:37 am    Post subject: Plenum vs engine lifting rings Reply with quote

Just a heads up,
I'm not sure how critical 1 or 2 bolts in the top of the crankcase are but I would be concerned about the higher probability of counterfeit bolts at a hardware store selling non-AN or non mil-psec hardware.

Counterfeit bolts:

http://www.anl.gov/Media_Center/Argonne_News/2005/an050411.htm#story3

. The counterfeit bolts are marked as being a certain grade, he explained, but in reality "they are a lower strength than what's needed to do the job." Lagessie replaced the counterfeit bolts and brought them to the attention of his division's Quality Assurance representative.

Lagessie said his concern about safety and counterfeit materials is driven by an incident that occurred while he was serving in the U.S. Navy: A counterfeit bolt broke loose from a catapult — a powerful device used to launch aircraft from carriers _ and struck a crewmember, killing him instantly.


http://www.businessweek.com/1996/24/b34791.htm

LOOSE BOLTS. Outside the U.S., the picture is even more troubling. Crashes include a Convair 580 belonging to Norway's Partnair charter airline, which disintegrated 22,000 feet over the North Sea in 1989, killing all 55 people aboard. The cause? Counterfeit bolts and bushings in the plane's tail, according to Norwegian aviation officials. Investigators, who were able to reassemble the wreckage in a hangar, said the plane's tail shimmied violently as the bolts came loose--and fell off in midair. Lawyers for the now-defunct airline deny the bogus parts caused the crash.


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