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Old 07-02-2022, 02:01 PM
N29945 N29945 is offline
Join Date: Dec 2020
Location: Mineola TX
Posts: 35
Default Cowling hinge pins.

I recently purchased a 6A and I need to repair the cowling fasteners, the pins are migrating almost all the way out in a hour flight, what is a good source of the four stainless pins that needs to be replaced with a longer pins so I can secure them.
The existing pin will fit snugly in a 7/64 drill bit index hole.
I looked in the Spruce catalog and did not find anything.

Jim Skinner
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Old 07-02-2022, 02:23 PM
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bruceh bruceh is offline
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,639

McMaster-Carr sells this material in just about every diameter imaginable.

Search for Multipurpose O1 Tool Steel Tight-Tolerance Rod.
Bruce Hill
RV-9A N5771H flown over 900 hours!
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EAA Tech Counselor, Pre Buys, Build assistance - canopy/tanks/fiberglass/electrical/repairs
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Old 07-02-2022, 02:28 PM
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Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,730

Use the pin for the hinges you have. Most have a smaller pin for the horizontal side hinges, larger diameter for aft cowl to fuselage hinge. The top cowl pin can is the smaller (but uses larger hinge) so the pin can make the bend. I use the larger pin and just reduce the diameter for the first 10” or so of the pin to make the bend. This removes some of the slop in the top center of the cowl.

Van’s will sell you the pins. The smaller pins will be in a coil (easy to ship), larger diameter pins will be sent in a PVC tube:

ACS is about the same:

No matter what, every cowl pin must have a retaining mechanism. Recommend you add these when you do this maintenance. No pin can be allowed to “migrate”.

There are good but easy ways to achieve this, as well harder and not as good.

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Old 07-02-2022, 02:44 PM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest
Posts: 2,323
Default Side hinges

Are the horizontal cowl side hinges different than the top and vertical side hinges?

It seems I only have enough of the big hinge material for the top and sides. I have enough small hinge for the sides. Dont know if I need to order more of the big or not.
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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Old 07-02-2022, 07:18 PM
bbsdad bbsdad is offline
Join Date: Oct 2018
Location: tx
Posts: 126

Smaller hing goes on the side. Most use the.090 diameter pins for the top cowl to firewall.
Hope this helps
RV-6 o-360, WW ga200 prop. 90% to go
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