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-   -   Cowl retaining pin (https://vansairforce.net/community/showthread.php?t=196707)

chevytoo 06-26-2021 06:09 PM

Cowl retaining pin
 
I came back from a flight and there was a large puddle of oil under the engine. I opened the oil door on the upper cowl and saw the right hand pin that holds the cowl in place sitting on the battery. It turns out the pin had shorted between the battery and the oil pressure hose. The hose has a large leak. I obtained new hose and will assemble it and install it soon. Vans drawings do not show a retainer for the pins at the firewall. I know how I will make retainers for both top cowl pins and that will be done after I clean up the oil mess. I lost only 1/2 quart but that does make a big mess. I see the advantage of modifying the cowl attach to 1/4 turn fasteners. I am confident the vertical pins on the side of the firewall will not be a problem.
Ray

Scott Hersha 06-26-2021 07:00 PM

You didnít say what model of RV you have, but cowl pins work very well on all RV models that i have seen, even on the top cowl. You just need a cowl pin retainer bracket mounted on the firewall - very easy to make/install. If you have a side by side model, it may be easier to make a small access panel in the aft surface of the top cowl in the center, to access the pins and provide the locking mechanism, but that makes it even easier to remove/install your cowl. The hinge holds the cowling very securely, doesnít pillow if done correctly, and is a fraction of the cost and weight of camlock fasteners.
Iíve used both methods, and I will be using hinges again on my current RV build.

chevytoo 06-26-2021 07:49 PM

I have an RV-9A. What you describe as a retainer is what I had figured to make.
Ray

gasman 06-27-2021 12:50 AM

I would question the installation of the "pin".

First, If a pin backed out, it would conflict with the left "pin" and would need to bend forward or down to continue to back out of the hinge.

Second, the "pin" is under tension due to the curve of the cowl and is difficult to install and remove by hand. I would say that the "pin" was not properly installed.

If your "pin" slid in and out with ease, then it was the wrong diameter. There is reason most all car manufacturers have a non metallic cover on the + terminal of the battery.

There is a reason Vans drawings do not show a retainer for the "pins" at the firewall.

BH1166 06-27-2021 06:03 AM

1 Attachment(s)
Several months ago I inquired as to a Vans design of top pin retention…. someone shared this firewall top pin retainer. I believe this is a part in 14 kits.

Walt 06-27-2021 08:18 AM

I've seen lots of migrated pins, retainers are a good idea especially over the battery.
That situation could have been much worse. A boot on leads also helps prevent this from happening.

chevytoo 06-27-2021 02:03 PM

Thanks for the feedback. I do have boots on the battery terminals. The pin slid under the boot when it fell out. The pin is the diameter per Vans drawings and was fully installed. I like the retainer in the photo and will make one similar. Ray

WingsOnWheels 06-28-2021 02:51 PM

I don't have a good picture, but I just added a couple screwes to the firewall with a spacer and washer to for a T. The handle on the pin just goes behind the T under some tension. Easy peasy.

bruceh 06-28-2021 03:41 PM

Easy retainer fix. Just a small section of aluminum angle riveted to the firewall. Notched out a little slot to hold the ends of the pins.


avrojockey 06-29-2021 02:48 PM

Great ideas here! My pins walk but then they run into each other and stop. My battery box is in the plans location (far left side of firewall) so not sure if there's a threat of a pin short.


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