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06-09-2011, 09:13 PM
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Join Date: Oct 2005
Location: Chicago sw suburbs
Posts: 395
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alt. tension arm bolt ?
I have tried various 5/16 bolts; grade 8, fine thread and can't get anything to thread into my 0-320 engine case to hold the tension arm on. Is this a special bolt?
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06-09-2011, 09:16 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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Like almost all bolts on the Lycosaurus, it is a course thread.
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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06-10-2011, 12:27 AM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Yep
Of course it's a coarse thread.... it's Lycoming!
Apolgies, Paul.  I just couldn't resist!  |
06-10-2011, 05:55 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Coarse thread bolts are almost always used when screwing into a casting.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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06-10-2011, 07:49 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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When I was looking for this same bolt, it seemed the proper one to use was MS20074-05-06. It has a hole in the cap for safety wire. PlanePower includes them in their kits if you buy from them (which I didn't), and Skytec specifies their use for the stabilizing bracket between the starter and alternator.
http://www.plane-power.com/images/In...L12-EI60_B.pdf
http://www.skytecair.com/Hardware.htm
Problem is these dang bolts are so hard to find, and once I did find them I nearly choked when I saw the price. Some folks wanted upwards of $10 apiece. After an extensive search I ended up finding them for a reasonable price (drop shipped from Cessna) but had to buy 10, which is way more than I'll ever need. PM me if you need some.
__________________
Kurt W.
RV9A
FLYING!!!
Last edited by krw5927 : 06-10-2011 at 07:54 AM.
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06-10-2011, 10:44 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by krw5927
When I was looking for this same bolt, it seemed the proper one to use was MS20074-05-06. It has a hole in the cap for safety wire. PlanePower includes them in their kits if you buy from them (which I didn't), and Skytec specifies their use for the stabilizing bracket between the starter and alternator.
http://www.plane-power.com/images/In...L12-EI60_B.pdf
http://www.skytecair.com/Hardware.htm
Problem is these dang bolts are so hard to find, and once I did find them I nearly choked when I saw the price. Some folks wanted upwards of $10 apiece. After an extensive search I ended up finding them for a reasonable price (drop shipped from Cessna) but had to buy 10, which is way more than I'll ever need. PM me if you need some. |
My Lycoming parts manual uses the number STD-1817, and Cessna says it has a superceded number of LW31H0.75
Using the new number, www.aeroinstock.com has it for $3.54
http://www.aeroinstock.com/products/...ail/index.html
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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06-10-2011, 12:53 PM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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Yep, that's about right. Since mine came direct from Cessna, they were about $2.50 apiece. But, only sold in 10-packs.
__________________
Kurt W.
RV9A
FLYING!!!
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