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04-21-2013, 05:35 PM
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Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 877
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Safety wired exhaust studs?
While perusing the Aircraft Spruce catalog I noticed that they have SS exhaust studs with pre-drilled safety wire holes. Does anybody here safety wire their studs? If so, may I see a picture and get your opinion on how you like it on a Lycoming? Thanks! - Karl
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Karl, Goodyear, Arizona (KGYR) ATP, CFII
RV-14A, Flying
Extra 330LX, Flying
RV-8, Sold
RV-7, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2020
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04-21-2013, 10:40 PM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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I would say most of us use the star lock washers provided with exhaust system. Recheck torque at oil changes. No problems or loosening so far.
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Good judgment comes from experience, and a lot of that comes from bad judgment.
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04-21-2013, 11:58 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Are you sure the holes are for safety wire, and not cotter pins??
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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04-22-2013, 05:03 AM
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Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 877
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Yep, the description on ACS says for safety wire. The studs are a little over $11 each. It got me to thinking "who does this??" since I'm a star washer guy like everyone else I know.
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Karl, Goodyear, Arizona (KGYR) ATP, CFII
RV-14A, Flying
Extra 330LX, Flying
RV-8, Sold
RV-7, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2020
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04-22-2013, 08:40 AM
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Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
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I've never seen a safety wired exhaust flange stud either, always star washers.
The only catastrophic failures I've ever heard about at the exhaust flange have been where the pipe cracks away from the flange and the flange itself stays securely bolted to the cylinder head.
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Neal Howard
Airplaneless once again...
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04-22-2013, 07:42 PM
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Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 877
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Yowzah! That would be catastrophic!
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Karl, Goodyear, Arizona (KGYR) ATP, CFII
RV-14A, Flying
Extra 330LX, Flying
RV-8, Sold
RV-7, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2020
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